Legal limits do not equal optimal health. All contaminants on this page are within EPA legal limits. Nashville Metro Water received zero drinking water violations in 2025. EWG exceedances reflect EWG's more conservative health thresholds — not regulatory violations. Mount Juliet water is legally safe to drink.
2025 Official CCR Data — Nashville Metro Water Services
Nashville Metro Water published its 2025 Consumer Confidence Report in May 2026. Parts of Mount Juliet and Wilson County are served by Nashville Metro Water. Key confirmed findings:
range 13.4–65.5 · EPA limit: 80 ppb
"moderately hard" per Nashville MWS
105 substances tested
Lead 90th%: 0.8 ppb (2025)
TTHMs: 43.5 ppb highest LRAA (range 13.4–65.5 ppb) — within EPA 80 ppb limit. HAA5: 27.8 ppb highest LRAA (range 7.8–36.0 ppb) — within EPA 60 ppb limit. Nitrate: 0.362 ppm (0.336–0.392 range). Fluoride: 0.67 ppm. Sodium: 12.20 ppm. Chlorine: 1.60 ppm (0.8–2.8). Turbidity: 99.9% below 0.3 NTU. E. Coli: 0 positives. Lead: 0.8 ppb 90th% — 0 of 85 exceeded AL. Copper: 0.130 ppm — 0 of 85 exceeded AL. Total hardness: 100.5 mg/L avg (88.5–128.4 range) = 5.88 GPG avg. Source: Cumberland River. K.R. Harrington (112 MGD) + Omohundro (90 MGD). TN0000494 received ZERO drinking water violations in 2025.
Your Five Mount Juliet-Area Utilities at a Glance
Mount Juliet and Wilson County are served by multiple utilities depending on your address. West Wilson Utility District serves most city residents. Confirm your utility by checking your water bill.
Gladeville Utility District
Nashville Metro Water Services
Laguardo Utility District
Venue @ 109
Mount Juliet: one of Tennessee's fastest-growing cities — multiple water service areas
Mount Juliet has grown dramatically and sits at the intersection of multiple water service areas. West Wilson Utility District serves most city residents from surface water with a perfect operational record. Gladeville UD serves eastern Wilson County from purchased groundwater. Parts of the area overlap with Nashville Metro Water. Your utility determines your specific contaminant profile, source water, and filtration needs.
Contaminants Exceeding EWG Health Guidelines
All contaminants below are within EPA legal limits. Nashville 2025 CCR figures are the most current verified data. All others are from EWG's historical database (2014–2023).
HAA5: 27.8 ppb LRAA (7.8–36.0)
HAA5/9 above EWG
HAA5/9 above EWG
West Wilson Utility District's outstanding operational record: West Wilson UD achieved perfect Sanitary Survey scores (100/100) in 2023, 2021, 2019, and 2017 — four consecutive perfect TDEC inspections. In a voluntary PPCP study, all pharmaceuticals and personal care products tested returned Below Detection Limit results. These operational positives don't change the EWG contaminant profile but reflect excellent utility management.
All Five Utilities — Side-by-Side Comparison
| Contaminant | EWG Guideline | West Wilson TN0000743 |
Gladeville UD TN0000264 |
Nashville MWS 2025 CCR |
Laguardo UD TN0000394 |
Venue@109 TN0008297 |
|---|---|---|---|---|---|---|
| Bromodichloromethane | 0.06 ppb | Above EWG | 5.30 ppb · 88x | Part of 43.5 ppb TTHMs | Above EWG | Above EWG |
| TTHMs | 0.15 ppb / 80 ppb | Above EWG | Above EWG | 43.5 ppb LRAA (13.4–65.5) | Above EWG | Above EWG |
| HAA5 | 0.1 ppb / 60 ppb | Above EWG | Above EWG | 27.8 ppb LRAA (7.8–36.0) | Above EWG | Above EWG |
| PFOA / PFAS | 0.09 ppt / 4 ppt | Above EWG | Above EWG | Above EWG (EWG data) | Not in data | Not in data |
| Chromium-6 | 0.02 ppb | Above EWG | Above EWG | Above EWG | Not in data | Not in data |
| Nitrate | 0.14 ppm / 10 ppm | Above EWG | Above EWG | 0.362 ppm · 2.6x (2025) | Above EWG | Above EWG |
| Lead (most recent) | 0 / AL 15 ppb | EWG data | EWG data | 0.8 ppb 90th% · 0/85 exceeded AL (2025) | EWG data | EWG data |
| Hardness (verified) | — | Not specified | Not specified | 100.5 mg/L avg · 5.88 GPG (2025) | Not specified | Not specified |
| Above EWG / Total | — | 9 of 15 | 12 of 19 | 7 of 11 | 8 of 12 | 12 of 19 |
Protecting Children & Pregnant Women in Mount Juliet
Children and pregnant women face elevated risk from several contaminants in Mount Juliet-area water. Developing bodies are more vulnerable to the same exposures adults tolerate.
Disinfection byproducts have been linked in studies to pregnancy complications — low birth weight, preterm birth, and neural tube defects. Nashville's seasonal TTHM highs (up to 65.5 ppb) occur in summer. The first trimester is the highest-risk window. An under-sink reverse osmosis system provides the most complete protection during pregnancy.
Nitrate causes "blue baby syndrome" in infants under 6 months at high concentrations. All area utilities are far below the 10 ppm EPA limit. However, use RO-filtered water for infant formula — never boiled tap water (boiling concentrates nitrate, it doesn't remove it).
Nashville 2025: 0 of 85 exceeded the lead action level. But lead comes from home plumbing — pre-1986 homes may have lead solder. Children under 6 and pregnant women are most vulnerable. Always use cold tap water. Flush 30 seconds if water has sat overnight in older homes.
PFOA detected above EWG's guideline in West Wilson, Gladeville, and Nashville. Studies link PFAS to immune suppression, thyroid disruption, and developmental effects in children. Reverse osmosis is the most complete household treatment — whole-house carbon provides partial reduction at every tap and shower.
Your Pets & Mount Juliet Water Quality
The same contaminants in Mount Juliet's water affect your pets — and smaller animals face a proportionally larger impact. A 12-pound dog drinking the same Cumberland River tap water all day receives far more TTHMs and PFOA relative to body weight than an adult human.
A 15-pound dog drinking the same TTHM-level water as a 160-pound adult receives roughly 10x the relative exposure per pound of body weight. Long-term TTHM exposure has been associated with elevated bladder cancer risk in some dog breeds. PFOA accumulates in animal tissue over a lifetime of tap water consumption. The simplest fix: fill your pet's bowl from your RO-filtered tap.
Rabbits, guinea pigs, hamsters, and birds have extremely small body masses — their relative contaminant exposure per unit body weight is significantly higher than a human's. At Mount Juliet's levels there is no acute risk, but chronic lifetime exposure is a real consideration. RO-filtered water is strongly recommended for caged animals and birds.
Chlorine in Nashville tap water (1.60 ppm avg 2025) is directly toxic to fish and aquarium invertebrates at concentrations humans tolerate. Never add untreated tap water to a fish tank. Activated carbon removes free chlorine. RO water is the gold standard for sensitive species, reef tanks, and shrimp. Never boil tap water for aquarium use — it removes oxygen but not chloramine or TTHMs.
Dogs and cats: Fill their bowl from your RO-filtered tap. Whole-house carbon is a meaningful improvement if RO isn't installed. Small animals and birds: RO or filtered water strongly recommended. Fish: Always dechlorinate tap water before adding to tanks. Use RO for sensitive species.
What Hard Water Is Doing to Your Home Every Day
Nashville Metro Water's 2025 CCR confirms hardness at 100.5 mg/L (5.88 GPG) — moderately hard, with seasonal highs to 128.4 mg/L (7.51 GPG). Cumberland River limestone minerals create these daily effects.
At 5.88 GPG average, calcium and magnesium ions disrupt the skin's moisture barrier after showering — dryness, irritation, and increased eczema risk for children. Hard water deposits coat hair making it feel rough and dull. Color-treated hair fades faster. A softener or KDF showerhead filter addresses this directly.
White spots and cloudy film are calcium carbonate — limestone in liquid form. When Cumberland River hard water evaporates in your dishwasher, minerals bond to surfaces. Dishwasher detergent needs 50–75% more product in hard water. A softener eliminates spotting and extends appliance life.
Mineral deposits build up in fabric fibers — clothes feel stiff, whites yellow, colors fade, towels lose absorbency. Clothes washed in hard water wear out up to 15% faster. A softener restores detergent effectiveness and extends garment life significantly.
Scale on water heater elements reduces efficiency 8% per GPG (U.S. Dept. of Energy). Seasonal highs of 7.51 GPG reach the Hard zone. Mount Juliet's abundant new construction with tankless water heaters is particularly vulnerable — heat exchangers fail faster on untreated hard water.
Cumberland River Limestone Hard Water in Mount Juliet
Nashville Metro Water's 2025 CCR officially confirms hardness at 100.5 mg/L average (5.88 GPG), ranging 88.5–128.4 mg/L (5.17–7.51 GPG) through the year. Nashville classifies this as "moderately hard." The seasonal upper range (7.51 GPG) reaches the Hard zone. Treatment does not remove hardness minerals.
Mount Juliet Hard Water Impact Calculator
Default set to Nashville's 2025 verified average — the closest official data for Mount Juliet. Adjust to match your specific test results.
Cumberland River Limestone Hard Water Impact Calculator
Default: Nashville 2025 official average of 5.88 GPG (100.5 mg/L). Adjust to your test results.
Soft 3.5 GPG
Slightly Hard 7 GPG
Hard 10.5 GPG
Extremely Hard
Eco120°F
Standard130°F140°F
Tankless
PPM / mg/L
Grains per gallon
0–3Mod. Hard
3–5Hard
7–10Ext. Hard
10.5+
Mount Juliet & Wilson County Area Water Guide
Which utility serves your address depends on your location in Wilson County.
Find Your Area
Chlorine Residual in Mount Juliet Water
Mount Juliet Water Department and Wilson County utilities use chlorine as their primary disinfectant. While chlorine effectively kills bacteria and viruses, the residual that reaches your tap is worth knowing — especially because it directly drives the formation of the disinfection byproducts (TTHMs, HAAs, chloroform, bromodichloromethane) that are Clarksville’s biggest water quality concerns.
Mount Juliet tap water runs at pool-level chlorine concentration
Mount Juliet’s chlorine residual is estimated at approximately 1.60 ppm — within the pool range and consistent with Cumberland River source water utilities across Middle Tennessee. For comparison, the EPA-recommended range for a swimming pool is 1.0–3.0 ppm — meaning your Mount Juliet tap water contains chlorine at roughly the same concentration as pool water. This is within legal limits and effective for disinfection, but it is the direct cause of the elevated TTHMs and haloacetic acids in Mount Juliet water. An NSF/ANSI 42-certified activated carbon filter removes chlorine taste and odor completely and reduces the formation of disinfection byproducts at the point of use.
Bottom line: You cannot taste or smell chlorine at ~1.60 ppm the way you do in a pool because pool water is on your skin, not passing through your palate. But the chemistry is the same — and in Clarksville water it reacts with source water organic matter to form TTHMs and haloacetic acids above EWG guidelines. A whole-house activated carbon system is the most effective way to intercept chlorine before it reacts with your pipes and fixtures.
What chlorine at pool levels does to your body and home
Chlorine strips the skin’s natural oils and disrupts the moisture barrier. At ~1.60 ppm — daily shower exposure — it causes dryness, itching, and irritation. People with eczema or sensitive skin often notice significant improvement after installing a whole-home carbon filtration system.
Chlorine oxidizes hair proteins, breaking down the outer cuticle layer. This causes dryness, frizz, brittleness, and color fade in dyed hair. At pool-range concentrations, daily washing strips the natural sebum that keeps hair supple. A shower-head carbon filter or whole-house system prevents this entirely.
Chlorine is an antimicrobial agent — that is exactly why utilities use it. Consumed daily in drinking water, it does not distinguish between harmful pathogens and beneficial gut microbiome bacteria. Emerging research links chronic chlorinated water consumption to microbiome disruption and digestive sensitivity. An under-sink carbon or RO filter removes chlorine from drinking water completely.
Chlorine bleaches and degrades fabric fibers over time, causing colors to fade faster, whites to yellow, and fabrics to wear thin sooner than they should. This is especially noticeable on dark clothing and athletic wear. Whole-house activated carbon filtration extends the life of clothes and towels significantly — a measurable return on investment over time.
The same pool-level chlorine that causes red, irritated eyes when swimming is present in your shower steam. Daily inhalation of chlorinated steam during showers exposes mucous membranes to chlorine gas byproducts. People with asthma or respiratory sensitivity often notice shower-steam irritation that disappears after installing a carbon shower filter.
Dogs and cats absorb chlorine through their skin and ingest it while drinking tap water. Many pet owners report improved coat condition after switching to filtered water. Chlorinated water also stresses chlorine-sensitive houseplants — fiddle leaf figs, ferns, and tropical plants in particular. Letting tap water sit overnight allows some chlorine to off-gas, but carbon filtration removes it completely and instantly.
Chlorine and newborn health in Mount Juliet
Infants under 12 months should not drink tap water containing chlorine without filtration — including water used to mix formula. Clarksville’s verified ~1.60 ppm chlorine residual is the highest in the Middle Tennessee guide series — nearly double Nashville’s 1.60 ppm. The EPA sets no specific infant standard for chlorine, but pediatric health research consistently identifies disinfection byproducts (TTHMs, HAAs) from Duck River chlorination as a concern for early-life exposure.
Chlorine and its byproducts (TTHMs, HAAs) concentrate in formula made with unfiltered tap water. At ~1.60 ppm — at the top of the pool range — Clarksville tap water carries the highest disinfection byproduct formation potential of any city in this series. An NSF/ANSI 42 activated carbon filter at the kitchen tap removes chlorine completely before mixing.
A newborn’s gut microbiome is still colonizing in the first months of life. Chlorine is antimicrobial by design — it does not distinguish between pathogens and beneficial bacteria. Filtered water is recommended for all infant consumption during this critical developmental window.
A newborn’s skin is 20–30% thinner than adult skin and absorbs chlorine during bathing. Pool-level residuals in tap water dry and irritate the developing skin barrier. A whole-home carbon filter removes chlorine from bath water — the most complete protection for infants bathing daily.
Chlorine off-gasses from warm water. During an infant bath or humidifier use with unfiltered tap water, the baby inhales chlorinated steam — a concern for developing lungs and airways. Whole-home carbon filtration removes chlorine before it reaches the tap, eliminating this exposure pathway.
If you have a newborn or are expecting: An NSF/ANSI 42 activated carbon filter at the kitchen tap removes chlorine from drinking and formula water. A whole-home carbon system removes it from bath water and humidifiers as well. At Clarksville’s ~1.60 ppm level — the highest in Middle Tennessee — this is the single most important water filter investment for any household with a newborn.
The fix is simple and affordable. An NSF/ANSI 42-certified activated carbon filter — whether whole-house or under-sink — removes chlorine completely at the point of use. For Mount Juliet homes concerned about chlorine and Cumberland River disinfection byproducts, TTHMs, HAAs), a whole-house carbon system addresses both problems in one installation. See the filter recommendations below for Mount Juliet-specific sizing and pricing.
Filter Recommendations for Mount Juliet Homes
Filter Recommendations for Mount Juliet Homes
Filter Recommendations for Mount Juliet Homes
Filter Recommendations for Mount Juliet Homes
Cumberland River disinfection byproducts are the dominant concern across all five utilities. Moderate limestone hardness (5.88 GPG avg, up to 7.51 GPG seasonal) is the primary infrastructure concern.
The Mount Juliet Water Treatment Recommendation
Get a personalized recommendation for your Mount Juliet address.
Connect with a vetted Wilson County water treatment professional.