Select your city to see the recommended filters for your specific water:
Red-outlined cities have PFAS detected above EWG health guidelines — verify your specific utility.
Select your city above to see filter recommendations matched to your utility’s verified 2025 water quality data.
Nashville
Nashville MWS (TN0000494) · Cumberland River · 2025 CCR verified
Zero PFAS detected
Zero violations 2025
TTHMs 43.5 ppb
5.9 GPG
Water hardness
43.5 ppb
TTHMs (LRAA)
Zero
PFAS detected
0
Health violations
Treat these
TTHMs 43.5 ppb LRAA (above EWG 0.15 ppb)
HAA5s 27.8 ppb (above EWG 0.1 ppb)
Chlorine 1.60 ppm avg residual — taste & odor
Chromium-6 trace — RO recommended
Chlorine residual 1.60 ppm (avg). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Nashville tap water. Activated carbon removes chlorine completely.
No treatment needed
PFAS — zero detection (2024 CCR)
Lead — utility in compliance
Nitrate — not a concern
Bacteria — treated city water
1
Whole-house activated carbon filter
TTHMs & HAA5s at every tap and shower — skin absorption matters
$1,400–$4,500
NSF/ANSI 42 + 53
A backwashing whole-house activated carbon system installed at the main supply line removes chlorine, TTHMs, HAA5s, and other disinfection byproducts before water reaches any outlet. Activated carbon (NSF/ANSI 42+53 certified) removes chlorine and TTHMs completely. Nashville uses free chlorine — standard activated carbon is fully effective and activated carbon is unnecessary. Media life: 3–6 years. Ask for the Performance Data Sheet showing TTHM reduction percentage at rated flow rate.
2
Under-sink reverse osmosis (NSF/ANSI 58)
Drinking & cooking water — chromium-6, nanoplastics, full TDS reduction
$600–$2,000
NSF/ANSI 58
An under-sink RO system at the kitchen tap eliminates the need for bottled water at approximately 4 cents per gallon. Removes chromium-6, any residual TTHMs, nanoplastics, and all dissolved contaminants. Look for 75–100 GPD membrane capacity for a family of 3+. Nashville does not require PFAS-specific RO treatment based on current zero-detection data — standard NSF/ANSI 58 is sufficient.
Opt
Water softener (32,000 grain)
5.9 GPG — quality of life, essential if you have a tankless water heater
$2,500–$3,500
WQA Gold Seal
At 5.9 GPG Nashville is moderately hard — scale builds gradually. A softener is a quality-of-life investment: better skin and hair, less soap, spot-free dishes. It becomes a stronger recommendation if you have a tankless water heater (scale in the narrow heat exchanger passages is a real risk over 3–5 years), skin sensitivity, or fine/color-treated hair. A 32,000-grain system sized for 5.9 GPG is appropriate for most Nashville households of 2–4 people.
Nashville Full Water Quality Guide
Verified CCR data, EWG comparisons, all contaminants
Franklin
Franklin Water Dept. (TN0000246) · Harpeth River · 2025 CCR verified
BrCHM 100x EWGPFOA traceZero violations
7.9 GPG
Hardness (verified)
100x EWG
BrCHM level
Trace
PFOA (below MCL)
0
Health violations
Treat these
Bromodichloromethane 6.01 ppb (100x EWG guideline)
TTHMs & HAA5s elevated from Harpeth River
PFOA trace (below EPA MCL, above EWG 0.5 ppt)
Hard water 7.9 GPG — appliance scale within 2–3 yrs
Chlorine residual 1.70 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Franklin tap water. Activated carbon removes chlorine completely.
No treatment needed
PFAS above EPA MCL — below 4 ppt limit
Lead — utility in compliance
Nitrate — not a concern
Bacteria — treated city water
1
Whole-house activated carbon filter
Bromodichloromethane 100x EWG — whole-house treatment is non-negotiable
$1,600–$4,500
NSF/ANSI 42 + 53
Franklin’s Harpeth River source water has higher organic loading than the Cumberland River, producing elevated disinfection byproducts. A whole-house activated carbon backwashing system treats water at every shower and tap — because TTHMs are absorbed through skin and inhaled during showering, not just ingested. This filter is the most impactful single investment for Franklin WD customers.
2
Water softener (40,000 grain)
7.9 GPG — scale damage to appliances measurable within 2–3 years
$2,500–$4,000
WQA Gold Seal
At 7.9 GPG, Franklin WD water is in the hard zone where a softener pays for itself in appliance protection within 4–5 years, faster with a tankless heater. A 40,000-grain system is appropriate for most Franklin households of 2–4 people at this hardness. Install the softener after the carbon filter in the treatment sequence.
3
Under-sink RO — NSF/ANSI 58 certified
PFOA trace + drinking water quality — RO removes all remaining contaminants
$700–$2,000
NSF/ANSI 58
For Franklin WD customers, verify that PFOA is specifically listed in the NSF/ANSI 58 certification documentation — not just that the system carries the 58 number. The PFOA in Franklin WD is below EPA’s 4 ppt MCL but above EWG’s 0.5 ppt health guideline. An RO system addresses this precautionarily while also removing residual TTHMs, chromium-6, nanoplastics, and improving taste significantly.
Franklin Full Water Quality Guide
BrCHM data, PFOA levels, verified 2025 CCR
Murfreesboro
MWRD (TN0000491) / CUD Rutherford · Stones River / Percy Priest Lake
Chromium-6 8.5x EWG (MWRD)Zero PFASExtremely hard
~12 GPG
Est. hardness
0.169 ppb
Chromium-6 (MWRD)
Zero
PFAS detected
0
Health violations
Treat these
Hard water est. 10–14 GPG — scale aggressive within 12–18 months
Chromium-6 0.169 ppb (8.5x EWG) — MWRD customers
TTHMs & HAA5s present from Stones River
Chlorine residual 1.53 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Murfreesboro tap water. Activated carbon removes chlorine completely.
No treatment needed
PFAS — not detected (2025 CCR)
Lead — utility in compliance
Nitrate — not a concern
1
Water softener (48,000–64,000 grain)
Extremely hard water — top priority for appliance protection
$2,800–$4,500
WQA Gold Seal
At estimated 10–14 GPG, Murfreesboro’s hardness is in the extremely hard zone. A softener is the top priority investment — scale accumulates aggressively in water heaters (efficiency loss within 12–18 months), dishwashers, and washing machines. A 48,000-grain system is the minimum for a family of 3–4 at 12 GPG; 64,000 grain if you have high water demand. Install at the main supply line, after any sediment pre-filter.
2
Whole-house carbon backwashing filter
TTHMs & HAA5s from Stones River at every tap
$1,400–$4,000
NSF/ANSI 42 + 53
After the softener, a whole-house activated or activated carbon backwashing filter removes the disinfection byproducts from Stones River source water. Install in the sequence: sediment pre-filter → softener → carbon filter. This ensures the carbon filter sees already-softened water, extending media life.
3
Under-sink RO — NSF/ANSI 58
Chromium-6 removal — essential for MWRD customers
$600–$2,000
NSF/ANSI 58
For MWRD customers: chromium-6 at 0.169 ppb is 8.5x EWG’s health guideline. An under-sink RO system removes chromium-6, residual TTHMs, and all dissolved contaminants from drinking and cooking water. CUD Rutherford customers (who have the same hardness but not the chromium-6 concern) still benefit from RO for overall drinking water quality. Reverse osmosis does not remove hardness efficiently — install your softener first.
Murfreesboro Full Water Quality Guide
Chromium-6 data, MWRD vs CUD Rutherford, verified CCR
Spring Hill
Milcrofton UD / Spring Hill WD / H.B.T.S. UD · Duck River · Verify your utility
PFOA above EWGVerify your utilityChloroform 102x EWG
~9 GPG
Est. hardness
Above EWG
PFOA (Milcrofton/Spring Hill WD)
102x
Chloroform vs EWG (Marshall Co.)
0
Health violations
Treat these
PFOA above EWG 0.5 ppt (Milcrofton UD & Spring Hill WD)
Chloroform 41.0 ppb (102x EWG — Marshall Co. WA)
TTHMs & HAA5s elevated from Duck River
Hard water ~9 GPG
Chlorine residual 1.45 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Spring Hill tap water. Activated carbon removes chlorine completely.
No treatment needed
Lead — city water in compliance
Nitrate — not a concern (city water)
Bacteria — treated city water
Critical first step: Verify which utility serves your specific address before purchasing any filter. Check your water bill. Milcrofton UD and Spring Hill WD have PFOA above EWG guidelines. H.B.T.S. UD and Harpeth Valley UD have different profiles. The filter recommendations below apply if you are on Milcrofton UD or Spring Hill WD.
1
Under-sink RO — NSF/ANSI 58 with PFOA listed
PFOA above EWG — drinking water protection is the first priority
$700–$2,000
NSF/ANSI 58 (PFOA specific)
For Milcrofton UD and Spring Hill WD customers: install an NSF/ANSI 58 certified RO system immediately. Critically — verify that PFOA is explicitly listed in the certification documentation, not just that the system carries the 58 number. Ask the vendor: "Show me the contaminant list covered under this NSF 58 certification, and confirm PFOA is included." If they cannot show you this documentation, choose a different system.
2
Whole-house activated carbon filter
Chloroform 102x EWG + all TTHMs at every outlet
$1,400–$4,500
NSF/ANSI 42 + 53
Duck River source water produces elevated disinfection byproducts at all Spring Hill area utilities. Chloroform levels in the Marshall County Water Authority (which serves parts of the Spring Hill area) measured at 102x EWG’s health guideline. A whole-house carbon system addresses these at every shower and tap.
3
Water softener (40,000 grain)
~9 GPG hardness — appliance protection
$2,500–$4,000
WQA Gold Seal
At approximately 9 GPG, Spring Hill area water is in the hard zone where a softener is recommended for appliance protection. Scale accumulates in water heaters and dishwashers within 2–3 years. A 40,000-grain system is appropriate for most households.
Spring Hill Full Water Quality Guide
PFAS data, all five utilities, Duck River source water
Smyrna
Smyrna WS / CUD Rutherford · Percy Priest Lake · 2025 CCR
Zero PFASAward of ExcellenceExtremely hard
~12 GPG
Est. hardness
47 ppb
TTHMs
Zero
PFAS detected
100%
TDEC score
Treat these
Extremely hard water est. 10–14 GPG — the dominant daily concern
TTHMs 47 ppb & HAA5s from Stones River
Chlorine residual 1.53 ppm (highest RAA). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Smyrna tap water. Activated carbon removes chlorine completely.
No treatment needed
PFAS — not detected
Lead — Award of Excellence compliance
Nitrate — not a concern
Chromium-6 — not a concern (unlike MWRD)
1
Water softener (48,000–64,000 grain)
Extremely hard — scale starts on day one
$2,800–$4,500
WQA Gold Seal
At estimated 10–14 GPG, hard water is Smyrna’s top water quality issue. Dishwasher spots, stiff laundry, dry skin, and water heater scale are all immediate problems without a softener. A 48,000-grain system minimum for a family of 3–4.
2
Whole-house carbon filter
TTHMs 47 ppb & HAA5s
$1,400–$4,000
NSF/ANSI 42 + 53
After the softener, a whole-house carbon backwashing filter removes disinfection byproducts from Percy Priest Lake source water. Smyrna’s compliance record is excellent — the carbon filter addresses the EWG guideline exceedances that remain even in compliant utility water.
3
Under-sink RO (NSF/ANSI 58)
Drinking water — complete protection
$600–$2,000
NSF/ANSI 58
Unlike Murfreesboro MWRD, Smyrna does not have a chromium-6 concern — but an RO system still provides the highest-quality drinking water at 4 cents per gallon, replacing bottled water cost-effectively. Standard NSF/ANSI 58 is sufficient for Smyrna.
Smyrna Full Water Quality Guide
Percy Priest Lake source, Award of Excellence, 2025 CCR
La Vergne
La Vergne WS · Percy Priest Lake · 2025 CCR · Managed by Inframark
Zero PFASZero lead in system (LSLI)Extremely hard
~11 GPG
Est. hardness
Zero
PFAS detected
Zero
Lead service lines
0
Health violations
Treat these
Extremely hard water est. 10–12 GPG
TTHMs & HAA5s present
Chlorine residual 1.53 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as La Vergne tap water. Activated carbon removes chlorine completely.
No treatment needed
PFAS — zero detection
Lead — zero lead service lines confirmed LSLI
Chromium-6 — not a concern
1
Water softener (48,000 grain)
Extremely hard est. 10–12 GPG — essential appliance protection
$2,800–$4,500
WQA Gold Seal
La Vergne’s outstanding compliance record (zero lead, zero PFAS, LSLI complete) means the water supply side is well-managed. The hardness at the treatment end is the primary household concern. A softener is the investment that will have the most immediate daily impact for La Vergne residents.
2
Whole-house carbon filter
TTHMs & HAA5s
$1,400–$4,000
NSF/ANSI 42 + 53
Percy Priest Lake source water produces disinfection byproducts above EWG health guidelines even in well-managed utilities like La Vergne. Whole-house carbon addresses these at every outlet.
3
Under-sink RO (NSF/ANSI 58)
Drinking water quality
$600–$2,000
NSF/ANSI 58
Standard NSF/ANSI 58 is sufficient for La Vergne — no PFAS or chromium-6 specific requirements. An RO unit at the kitchen tap provides the cleanest possible drinking and cooking water at approximately 4 cents per gallon.
La Vergne Full Water Quality Guide
LSLI complete, zero PFAS, 2025 CCR
Brentwood
NCGUD (TN0000244) / Gateway Utility · est. 6–8 GPG
TTHMs 77.53 ppb (highest)Zero PFASZero violations
~7 GPG
Est. hardness
77.53 ppb
TTHMs LRAA (highest in guide)
145x EWG
BrCHM — Gateway
Zero
PFAS
Treat these
TTHMs 77.53 ppb LRAA — highest in entire guide series
BrCHM 8.70 ppb (145x EWG) — Gateway Utility customers
HAA5s 36.55 ppb above EWG
Chlorine residual 1.63 ppm (avg). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Brentwood tap water. Activated carbon removes chlorine completely.
No treatment needed
PFAS — zero detected
Lead — compliance record excellent
Nitrate — not a concern
1
Whole-house activated carbon — PRIORITY ONE
TTHMs 77.53 ppb — the highest in the entire Tennessee Water Authority guide series
$1,600–$4,500
NSF/ANSI 42 + 53
Brentwood’s NCGUD has the highest TTHM LRAA in our 17-utility guide series at 77.53 ppb — just under EPA’s 80 ppb limit. This is not a crisis but it is the highest-priority water quality issue in the area. A whole-house activated carbon system is essential, not optional. TTHMs are absorbed dermally during showering and inhaled as vapor — an under-sink filter alone does not address this exposure pathway.
2
Under-sink RO (NSF/ANSI 58)
Drinking water quality after whole-house carbon
$600–$2,000
NSF/ANSI 58
After the whole-house carbon reduces TTHMs at every outlet, an under-sink RO provides final-stage drinking and cooking water protection. Standard NSF/ANSI 58 is sufficient for Brentwood — no PFAS-specific requirement based on current zero-detection data.
Opt
Water softener (32K–48K grain)
Moderate-hard water — quality of life
$2,500–$4,000
WQA Gold Seal
Brentwood area hardness is estimated moderate-hard. A softener is optional but beneficial for skin, hair, and appliance protection especially if on NCGUD water with moderate GPG.
Brentwood Full Water Quality Guide
NCGUD TTHMs, BrCHM data, 2025 CCR
Clarksville
Clarksville WD / Woodlawn UD · Cumberland River · 5.67 GPG verified
Moderate hardnessWoodlawn TTHMs 68 ppbMonitor PFAS
5.67 GPG
Hardness (verified)
68.35 ppb
Woodlawn UD TTHMs
Watch
PFAS (Fort Campbell)
0
Health violations
Treat these
TTHMs — especially Woodlawn UD at 68.35 ppb
PFAS monitoring warranted (Fort Campbell proximity)
Chlorine residual 1.10 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Clarksville tap water — at the low end of the pool range. Activated carbon removes chlorine completely.
No treatment needed (currently)
Hardness 5.67 GPG — not urgent
PFAS — not detected in recent monitoring
Lead — utility in compliance
1
Whole-house activated carbon
TTHMs — Woodlawn UD especially; carbon addresses future PFAS changes too
$1,400–$4,500
NSF/ANSI 42 + 53
Carbon filter is the core investment for Clarksville area water. Verify which utility serves your address — Clarksville WD vs. Woodlawn UD changes the urgency level significantly (Woodlawn has much higher TTHMs). Activated carbon (NSF/ANSI 42+53 certified) removes free chlorine completely. All verified Middle Tennessee utilities use free chlorine — standard activated carbon is fully effective.
2
Under-sink RO (NSF/ANSI 58)
Precautionary PFAS protection + drinking water quality
$600–$2,000
NSF/ANSI 58
Fort Campbell is one of the largest military installations in the country and historical AFFF firefighting foam use at military bases is a primary PFAS source nationally. While current Clarksville area monitoring has not detected PFAS above action levels, an RO system provides precautionary protection while also addressing all other drinking water contaminants. Check your specific utility’s UCMR5 PFAS data in their most recent CCR.
Opt
Water softener (32K grain)
5.67 GPG — quality of life only
$2,500–$3,500
WQA Gold Seal
At 5.67 GPG Clarksville has the softest city water in Middle Tennessee alongside Nashville. A softener is a personal preference here — skin and hair effects are mild, and appliance scale builds very gradually. Worth it for skin-sensitive households or tankless heater owners.
Clarksville Full Water Quality Guide
Woodlawn UD vs Clarksville WD, PFAS status, 2025 CCR
Hendersonville
Hendersonville WS / Sumner County · Old Hickory Lake · 2026 CCR
Radium above EWG (unique)Zero PFASZero violations
~7 GPG
Est. hardness
Above EWG
Radium-226 & 228
Zero
PFAS detected
0
Health violations
Treat these
Radium-226 & 228 above EWG 0.05 pCi/L guideline — unique to Hendersonville
TTHMs present from Old Hickory Lake
Hard water ~7 GPG
Chlorine residual 1.20 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Hendersonville tap water. Activated carbon removes chlorine completely.
No treatment needed
PFAS — zero detected (2026 CCR)
Lead — utility in compliance
Nitrate — not a concern
1
Under-sink RO (NSF/ANSI 58)
Radium-226/228 removal — unique finding requiring RO at the drinking tap
$600–$2,000
NSF/ANSI 58
Hendersonville is unique among our 17 guide cities in having radium above EWG’s health guideline. Radium is a naturally occurring radioactive element from Old Hickory Lake’s geological formations. Reverse osmosis is the most effective household treatment for radium. Ion exchange (a water softener) also removes radium — but RO covers all other contaminants simultaneously and is the recommended first installation.
2
Whole-house carbon backwashing filter
TTHMs & HAA5s from Old Hickory Lake at every outlet
$1,400–$4,500
NSF/ANSI 42 + 53
Old Hickory Lake source water produces disinfection byproducts above EWG guidelines even in a well-managed system. Whole-house carbon addresses these at every shower and tap — important for the same skin absorption and inhalation reasons that apply across all Middle Tennessee surface water utilities.
Opt
Water softener (32K–40K grain)
~7 GPG — appliance protection and quality of life
$2,500–$4,000
WQA Gold Seal
At approximately 7 GPG, a softener is beneficial for appliances, skin, and hair. Also provides supplemental radium removal through ion exchange. Recommended if you have a tankless water heater or are coming from a softer-water city.
Hendersonville Full Water Quality Guide
Radium data, Old Hickory Lake, 2026 CCR
Gallatin
CSB (TN0000193) · Cumberland River
TTHMs 73.55 ppbZero PFASZero violations
~8 GPG
Est. hardness
73.55 ppb
TTHMs LRAA
Zero
PFAS
0
Violations
Treat these
TTHMs 73.55 ppb LRAA — just under EPA limit
HAA5s elevated
Hard water ~8 GPG
Chlorine residual 1.09 ppm (avg). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Gallatin tap water — at the low end of the pool range. Activated carbon removes chlorine completely.
No treatment needed
PFAS — zero detected
Lead — compliance record good
1
Whole-house activated carbon
TTHMs 73.55 ppb — whole-house treatment essential
$1,400–$4,500
NSF/ANSI 42 + 53
Gallatin’s TTHM level of 73.55 ppb LRAA is the third-highest in our guide series. Whole-house treatment is the right approach — TTHMs are not just a drinking water concern. Carbon backwashing system at the main supply line is the most impactful investment.
2
Under-sink RO (NSF/ANSI 58)
Drinking water quality
$600–$2,000
NSF/ANSI 58
Standard NSF/ANSI 58 is sufficient for Gallatin. RO eliminates residual TTHMs, improves taste significantly, and replaces bottled water at 4 cents per gallon.
Opt
Water softener (40K grain)
~8 GPG — appliance protection
$2,500–$4,000
WQA Gold Seal
At ~8 GPG Gallatin is in the hard zone. A softener is recommended for households with dishwashers, tankless heaters, or skin/hair sensitivity. Pays for itself in appliance protection within 4–5 years.
Gallatin Full Water Quality Guide
TTHMs 73.55 ppb, Cumberland River, verified CCR
Nolensville
NCGUD / Milcrofton UD area · Verify your utility
TTHMs 77.53 ppbVerify utility (PFAS risk)Zero violations
~8 GPG
Est. hardness
77.53 ppb
TTHMs (NCGUD)
Verify
PFAS (if Milcrofton UD)
0
Violations
Chlorine: Chlorine residual 1.63 ppm (avg). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Nolensville tap water. Activated carbon removes chlorine completely.
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1
Whole-house activated carbon
TTHMs 77.53 ppb (NCGUD) — same as Brentwood, second-highest in guide
$1,600–$4,500
NSF/ANSI 42 + 53
Nolensville overlaps with both the NCGUD service area (highest TTHMs in guide) and the Milcrofton UD service area (PFAS concern). Confirm your utility from your water bill first. If on NCGUD: whole-house carbon is the top priority for TTHMs.
2
Under-sink RO (NSF/ANSI 58 with PFOA listed if Milcrofton UD)
PFAS if Milcrofton UD; drinking water quality for all
$700–$2,000
NSF/ANSI 58
If you are on Milcrofton UD: verify PFOA is specifically listed in the NSF/ANSI 58 certification. If on NCGUD: standard NSF 58 is sufficient for drinking water. Either way, an under-sink RO system is the right drinking water investment.
Opt
Water softener (40K grain)
~8 GPG
$2,500–$4,000
WQA Gold Seal
Recommended for appliance protection and quality of life at ~8 GPG hardness.
Nolensville Full Water Quality Guide
NCGUD vs Milcrofton UD, PFAS data, verified CCR
Thompsons Station
H.B.T.S. UD / Franklin WD / Milcrofton UD · Harpeth/Duck Rivers · Verify your utility
PFOA above EWG (Milcrofton)9 of 13 above EWGZero violations
7.9 GPG
Est. hardness
9 of 13
Above EWG (H.B.T.S.)
PFOA
Above EWG (Milcrofton UD)
0
Violations
Chlorine: Chlorine residual 1.60 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Thompsons Station tap water. Activated carbon removes chlorine completely.
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1
Confirm your utility FIRST
Three utilities serve Thompsons Station — each has a different profile
Free step
Check your water bill
Thompsons Station is served by H.B.T.S. UD, Franklin WD, and Milcrofton UD depending on your specific address. Milcrofton UD has PFOA above EWG guidelines. H.B.T.S. UD has 9 of 13 contaminants above EWG. Franklin WD has BrCHM at 100x EWG. The correct filter recommendation depends on which utility serves you. Check your water bill today.
2
Under-sink RO (NSF/ANSI 58) — PFOA specific if Milcrofton UD
PFAS if Milcrofton; TTHMs/BrCHM for all utilities
$700–$2,000
NSF/ANSI 58
For Milcrofton UD: verify PFOA is listed in certification. For Franklin WD or H.B.T.S.: standard NSF 58 addresses BrCHM and all TTHMs at the drinking tap.
3
Whole-house activated carbon
TTHMs & BrCHM from Harpeth/Duck Rivers — all three utilities
$1,400–$4,500
NSF/ANSI 42 + 53
Regardless of which Thompsons Station utility you are on, all three source from Harpeth or Duck River water with elevated disinfection byproducts. Whole-house carbon is needed at every utility in this area.
Thompsons Station Full Water Quality Guide
All six utilities, PFAS data, verified CCR
Lebanon
WWAWC · Cumberland River · 2025 CCR
Zero PFASClean compliance recordHard water ~9 GPG
~9 GPG
Est. hardness
49 ppb
TTHMs
Zero
PFAS detected
0
Violations
Chlorine: Chlorine residual 1.60 ppm (avg). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Lebanon tap water. Activated carbon removes chlorine completely.
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1
Whole-house carbon filter
TTHMs 49 ppb & HAA5s
$1,400–$4,000
NSF/ANSI 42 + 53
Lebanon’s WWAWC has a clean compliance record and zero PFAS. The primary concern is the disinfection byproducts from Cumberland River water. Standard activated or activated carbon whole-home system addresses this comprehensively.
2
Water softener (40K grain)
~9 GPG — appliance protection recommended
$2,500–$4,000
WQA Gold Seal
At ~9 GPG Lebanon is in the hard zone. A softener is recommended for appliance protection, skin and hair benefits, and reduced soap consumption. Pays for itself within 4–5 years in reduced appliance maintenance.
3
Under-sink RO (NSF/ANSI 58)
Drinking water quality
$600–$2,000
NSF/ANSI 58
Standard NSF 58 is sufficient for Lebanon. No PFAS or chromium-6 specific requirements. Provides clean drinking water and replaces bottled water.
Lebanon Full Water Quality Guide
Zero PFAS confirmed, 2025 CCR
Mount Juliet
West Wilson UD / Gladeville UD · Cumberland River · est. 9 GPG
BrCHM 88x EWG (Gladeville)Zero PFAS9 of 15 above EWG
~9 GPG
Est. hardness
88x EWG
BrCHM (Gladeville UD)
Zero
PFAS
0
Violations
Chlorine: Chlorine residual 1.60 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Mount Juliet tap water. Activated carbon removes chlorine completely.
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1
Whole-house activated carbon
BrCHM 88x EWG (Gladeville); TTHMs (West Wilson) — whole-house essential
$1,400–$4,500
NSF/ANSI 42 + 53
Mount Juliet is served by two utilities with different but both elevated disinfection byproduct profiles. Gladeville UD has bromodichloromethane at 88x EWG’s health guideline. West Wilson UD shows 9 of 15 contaminants above EWG guidelines. Whole-house activated carbon addresses both utility profiles comprehensively.
2
Water softener (40K grain)
~9 GPG
$2,500–$4,000
WQA Gold Seal
At ~9 GPG Mount Juliet is hard enough that a softener provides clear return on investment in appliance protection within 3–4 years.
3
Under-sink RO (NSF/ANSI 58)
Drinking water quality
$600–$2,000
NSF/ANSI 58
Standard NSF 58. Addresses any residual BrCHM after whole-house carbon, plus all other drinking water contaminants.
Mount Juliet Full Water Quality Guide
West Wilson UD vs Gladeville UD, BrCHM data
Columbia
Columbia / Marshall County WA · Duck River · est. 8 GPG
Zero PFASRate hikes 20%/yrTTHMs from Duck River
~8 GPG
Est. hardness
Elevated
TTHMs (Duck River)
Zero
PFAS
20%/yr
Rate hikes 2025–2030
Chlorine: Chlorine residual 1.45 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Columbia tap water. Activated carbon removes chlorine completely.
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1
Whole-house carbon filter
TTHMs from Duck River organic loading
$1,400–$4,000
NSF/ANSI 42 + 53
Duck River has higher organic content than the Cumberland River, producing elevated disinfection byproducts at all Duck River utilities including Columbia. Whole-house activated carbon addresses TTHMs and HAAs comprehensively.
2
Water softener (40K grain)
~8 GPG — appliance protection
$2,500–$4,000
WQA Gold Seal
At ~8 GPG, a softener is recommended for appliance protection. Given Columbia’s significant rate increases (up to 20% per year through 2030), factoring in a softener’s contribution to appliance efficiency and lifespan makes financial sense in the medium term.
3
Under-sink RO (NSF/ANSI 58)
Drinking water quality
$600–$2,000
NSF/ANSI 58
Standard NSF 58 for drinking water. No PFAS or chromium-6 specific requirements. If on a private well in rural Maury County: add nitrate and bacterial testing before any filter purchase.
Columbia Full Water Quality Guide
Duck River, rate hike data, 2025 CCR
Springfield
Springfield WS · Red River · est. 8 GPG
Atrazine 2.6x EWG (unique)Zero PFASZero violations
~8 GPG
Est. hardness
2.6x EWG
Atrazine (unique finding)
Zero
PFAS
0
Violations
Chlorine: Chlorine residual 1.30 ppm (est.). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Springfield tap water. Activated carbon removes chlorine completely.
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1
Whole-house activated carbon
Atrazine 2.6x EWG AND TTHMs — carbon removes both herbicide and DBPs
$1,400–$4,000
NSF/ANSI 42 + 53
Springfield is unique in the guide series for atrazine — an agricultural herbicide that leaches from Robertson County tobacco and row crop operations into the Red River source water. Activated carbon is the primary treatment for atrazine and removes it along with the disinfection byproducts that are also present. This is an uncommon contaminant combination that makes whole-house carbon the clear first priority.
2
Under-sink RO (NSF/ANSI 58)
Atrazine at the drinking tap + all remaining contaminants
$600–$2,000
NSF/ANSI 58
RO removes atrazine at the drinking tap as a final-stage layer of protection after the whole-house carbon. Standard NSF 58 is sufficient; no PFAS-specific certification needed.
Opt
Water softener (40K grain)
~8 GPG — appliance protection
$2,500–$4,000
WQA Gold Seal
Recommended for households with dishwashers, tankless heaters, or skin sensitivity. The atrazine and DBP concerns make the carbon filter and RO higher priorities.
Springfield Full Water Quality Guide
Atrazine data, Red River source water, Robertson County
Dickson
WADC · Piney River / Cumberland blend · est. 8 GPG
Chloroform 82x EWGZero PFASZero violations
~8 GPG
Est. hardness
82x EWG
Chloroform (WADC)
Zero
PFAS
0
Violations
Chlorine: Chlorine residual 2.56 ppm (avg). A typical swimming pool runs 1.0–3.0 ppm chlorine as an active sanitizer — the same concentration range as Dickson tap water — elevated even by pool standards. Activated carbon removes chlorine completely.
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1
Whole-house activated carbon — PRIORITY ONE
Chloroform 32.9 ppb (82x EWG) — whole-house treatment is non-negotiable
$1,400–$4,500
NSF/ANSI 42 + 53
Dickson’s WADC (Water and Wastewater Authority of Dickson County) shows chloroform at 32.9 ppb — 82x EWG’s health guideline of 0.4 ppb. This elevated disinfection byproduct level requires whole-house treatment. Note: if you are on a private well in Dickson County (common in rural areas), the concerns are completely different — acidic pH, iron, and bacteria dominate. Confirm whether you are on city water or a well.
2
Under-sink RO (NSF/ANSI 58)
Drinking water — chloroform elimination at the kitchen tap
$600–$2,000
NSF/ANSI 58
After the whole-house carbon reduces chloroform at every outlet, RO provides final-stage drinking water protection. Standard NSF 58 is sufficient for Dickson city water.
Opt
Water softener (40K grain)
~8 GPG — quality of life and appliance protection
$2,500–$4,000
WQA Gold Seal
At ~8 GPG, a softener is recommended but secondary to the carbon filter given the chloroform levels. For well owners in Dickson County: a full well treatment sequence (sediment, acid neutralizer for acidic pH, AIO iron filter, softener, UV) is the appropriate recommendation instead.
Dickson Full Water Quality Guide
Chloroform data, WADC, well water context
Any system that can’t be adjusted to your water is already obsolete
Water quality is not a fixed target. Your Middle Tennessee water hardness can shift seasonally. A new appliance may change your household demand. A water test result may reveal that your softener is working too hard — or not hard enough — for your actual conditions. A system that cannot be adjusted to respond to these changes is not a solution. It is a fixed answer to a moving question.
Before you sign any water treatment contract, ask whether you — the homeowner — can open a panel, turn a dial, or access a menu and change the hardness setting, regeneration cycle, salt dose, and backwash timing without scheduling a service call. If the answer is no, you are not buying equipment. You are buying a dependency.
Red flag: calling the company to change your hardness setting
If a technician needs to come to your home to adjust the hardness gauge on your water softener, you do not own that system. You are renting access to it — at a premium, on their schedule, at their labor rate. A locked hardness setting is not a safety feature. It is a service contract disguised as equipment.
The question to ask before you sign
“Can I personally adjust the hardness level, regeneration cycle, salt dose, and backwash timing on this system — right now, on this unit, without calling you?”
Ask them to show you. On the actual unit. Before you sign. If they cannot demonstrate it in your driveway or at a showroom, assume you will not be able to do it at home.
What owner-adjustable looks like
✓Hardness setting adjustable from the control panel
✓Regeneration frequency you can change yourself
✓Salt dose dial or digital input accessible to homeowner
✓Backwash timing visible and editable without a technician
✓Error codes and diagnostics readable without calling the company
✓Owner’s manual provided at installation with full settings documentation
Red flags: not owner-adjustable
✗Control panel is locked or requires a service code to access
✗Hardness settings “pre-programmed by our technicians”
✗Salesperson says adjustments are “included in your service plan”
✗No owner’s manual provided at installation
✗App or interface requires a company account to access system settings
✗Company says you must call them to change the hardness gauge
Filters to avoid on Middle Tennessee city water
Not every filter a salesperson recommends is necessary — or appropriate — for treated Middle Tennessee municipal water. These two are the most commonly oversold add-ons in the region.
Sediment pre-filter on city water
Unnecessary upsellMiddle Tennessee municipal water — Nashville MWS, NCGUD, Smyrna WS, Gallatin CSB, and every other utility in this guide — is treated and filtered before it reaches your meter. There is no meaningful sediment load in treated city water that requires a pre-filter at the point of entry. A mandatory pre-filter on a whole-home system installed on city water is almost always an upsell, not an engineering requirement.
Pre-filters reduce water pressure throughout your home as the cartridge loads with particulate — a clogged cartridge can drop household pressure by 10–20 PSI. Cartridges need replacement every 3–6 months at $30–$80 each, adding $60–$160 per year in ongoing cost that is rarely mentioned in the initial quote. A well-designed whole-home activated carbon system or softener on treated Middle Tennessee city water does not need one.
Unnecessary cost: $200–$600 upfront + $60–$160/yr in cartridges
Exception: Private well water with confirmed high sediment, turbidity, or iron — a sediment pre-filter is appropriate and often necessary. Always base this on a water test result, not a salesperson’s recommendation.
UV light system on city water
Redundant on municipal waterUV disinfection systems kill bacteria and viruses by exposing water to ultraviolet light. They are a genuinely effective technology — for private well water, where no disinfection has been applied and bacterial contamination is a real risk. On treated Middle Tennessee city water, they are redundant.
Every utility in this guide already chlorinates at residuals between 1.09 ppm (Gallatin) and 2.56 ppm (Dickson) — levels specifically calibrated to eliminate bacterial and viral contamination throughout the distribution system. Adding a UV system on top of this is not improving your water safety. It is paying for a second disinfection layer on water that has already been disinfected. Any salesperson who recommends a UV system for a standard Middle Tennessee city water installation without a specific documented reason should be asked: what pathogen risk does my utility’s CCR show that justifies this?
Unnecessary cost: $400–$1,200 installed + $80–$150/yr lamp replacement
Exception: Private well water, any home with a confirmed boil-water notice history, or any home where internal plumbing is suspected to harbor bacterial contamination. UV is the right tool for these scenarios.
Frequently Asked Questions
For Nashville Metro Water Services (5.9 GPG, zero PFAS detected, TTHMs 43.5 ppb): the best setup is a whole-house activated carbon backwashing filter ($800–$3,000 installed, NSF/ANSI 42+53 certified) plus an under-sink reverse osmosis system ($600–$2,000 installed, NSF/ANSI 58 certified). The carbon filter addresses TTHMs and HAA5s at every shower and tap. The RO system provides pristine drinking and cooking water. A water softener (32,000 grain) is optional at 5.9 GPG but recommended if you have a tankless water heater or skin sensitivity.
Murfreesboro requires a three-component system: (1) Water softener sized for 10–14 GPG (48,000–64,000 grain, $2,800–$4,500 installed) — this is the top priority because extremely hard water causes aggressive appliance damage. (2) Whole-house carbon filter for TTHMs from Stones River ($1,400–$4,000). (3) Under-sink RO system — essential for MWRD customers due to chromium-6 at 0.169 ppb (8.5x EWG). Total system budget: $5,000–$10,500. CUD Rutherford customers (excellent compliance score, 100% TDEC 2025) have the same hardness priority but not the chromium-6 finding.
Yes — but only if you are on Milcrofton Utility District or Spring Hill Water Department, which have detected PFOA above EWG’s 0.5 ppt health guideline. If you are on either of those utilities, install an NSF/ANSI 58 certified under-sink RO system with PFOA specifically listed in the certification documentation. Other Spring Hill and Thompsons Station utilities (H.B.T.S. UD, Harpeth Valley UD) have different profiles. Confirm your utility from your water bill before purchasing. All Spring Hill area utilities benefit from a whole-house activated carbon filter for disinfection byproducts from Duck River source water.
It depends on your city. Nashville (5.9 GPG) and Clarksville (5.67 GPG): softener is optional — quality of life benefit, more important with a tankless heater. Franklin (7.9 GPG) and Spring Hill (~9 GPG): softener is recommended — appliance damage measurable within 2–3 years. Murfreesboro, Smyrna, La Vergne (estimated 10–14 GPG): softener is essential — scale is aggressive and expensive. Rural wells in Williamson, Dickson, and Cheatham Counties (12–20+ GPG): softener is mandatory for appliance protection. Always get a certified GPG test before sizing a softener — never rely on estimates alone.
For all Middle Tennessee city water customers: NSF/ANSI 42 (chlorine/taste) and NSF/ANSI 53 (health contaminants including TTHMs, lead) for the whole-house carbon filter. NSF/ANSI 58 for the reverse osmosis system. WQA Gold Seal for water softeners. For Spring Hill area PFAS concerns: NSF/ANSI 58 with PFOA specifically listed in the certification contaminant documentation — not just the 58 number on the box. For Murfreesboro MWRD chromium-6: NSF/ANSI 58 for the RO system. Always ask for the Performance Data Sheet alongside any certification claim.
Before signing any water treatment contract: (1) Use the price ranges on this page as a starting reference. (2) Get at least two independent quotes. (3) Submit your quote for a free independent audit from Tennessee Water Authority — we review the system specs and price against verified data for your specific zip code and utility. A Nashville water softener installed at $6,500 should raise a red flag; $2,500–$3,500 is the fair range for a 32,000-grain system. A Murfreesboro three-system setup (softener + carbon + RO) at $14,000 warrants scrutiny; $5,000–$10,500 is the typical market range.
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