What was found in Montville's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2470 µg/L 25% of the EPA limit 10000 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 3593.5 µg/L — MOUNTVIEW APARTMENTS · 105 people · 2019 | 23/25 | SYR4 |
| Nitrate-Nitrite | 2625 µg/L 26% of the EPA limit 10000 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 3445 µg/L — MOUNTVIEW APARTMENTS · 105 people · 2019 | 23/25 | SYR4 |
| Fluoride | 992 µg/L 25% of the EPA limit 4000 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 1723 µg/L — ST. THOMAS MORE SCHOOL-THE COVE · 25 people · 2017 | 16/25 | SYR4 |
| Copper | 107.5 µg/L 8.3% of the EPA limit 1300 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 1123.5 µg/L — FREEDOM VILLAGE ELDERLY HOUSING · 43 people · 2019 | 25/25 | SYR4 |
| Nitrite | 860 µg/L 86% of the EPA limit 1000 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 4/25 | SYR4 |
| Lead | 17.6 µg/L 117% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 277 µg/L — FREEDOM VILLAGE ELDERLY HOUSING · 43 people · 2019 | 25/25 | SYR4 |
| TTHM | 115.47 µg/L 144% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 10/25 | SYR4 |
| Chloroform | 50.5 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 76.35 µg/L — SCWA, HILLCREST DIVISION (HLC) · 450 people · 2019 | 13/25 | SYR4 |
| Barium | 11 µg/L 0.5% of the EPA limit 2000 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 72.4 µg/L — FREEDOM VILLAGE ELDERLY HOUSING · 43 people · 2017 | 21/25 | SYR4 |
| Total Haloacetic Acids (HAA5) | 66.4 µg/L 111% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 11/25 | SYR4 |
| Gross Beta Particle Activity | 66.12 pCi/L No EPA limit set Highest in the city: SCWA, CHESTERFIELD DIVISION · 524 people · 2019 | 1/25 | SYR4 |
| Combined Uranium | 29.59 µg/L 99% of the EPA limit 30 µg/L Highest in the city: INDEPENDENCE VILLAGE ELDERLY HOUSING · 55 people · 2019 | 14/25 | SYR4 |
| Bromodichloromethane | 7.65 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 21.35 µg/L — SCWA, HILLCREST DIVISION (HLC) · 450 people · 2019 | 10/25 | SYR4 |
| Trichloroacetic Acid | 19 µg/L No EPA limit set Highest in the city: MONTVILLE WATER SUPPLY · 1,300 people · 2019 | 5/25 | SYR4 |
| Dichloroacetic Acid | 18.9 µg/L No EPA limit set Highest in the city: MONTVILLE WATER SUPPLY · 1,300 people · 2019 | 6/25 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 8.89 µg/L 148% of the EPA limit, at the 95th percentile of samples — 6 µg/L Highest in the city: FOX LAUREL MOBILE HOME PARK, LLC · 40 people · 2019 | 2/25 | SYR4 |
| Monochloroacetic Acid | 7.685 µg/L No EPA limit set Highest in the city: SCWA, HILLCREST DIVISION (HLC) · 450 people · 2019 | 4/25 | SYR4 |
| Dibromochloromethane | 0.8725 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 7.625 µg/L — MONTVILLE WATER SUPPLY · 1,300 people · 2019 | 10/25 | SYR4 |
| Bromoform | 5.9 µg/L No EPA limit set Highest in the city: SCWA, CHESTERFIELD DIVISION · 524 people · 2019 | 8/25 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.56 pCi/L 37% of the EPA limit 15 pCi/L Highest in the city: SCWA, CHESTERFIELD DIVISION · 524 people · 2019 | 12/25 | SYR4 |
| Dibromoacetic Acid | 3.52 µg/L No EPA limit set Highest in the city: MONTVILLE WATER SUPPLY · 1,300 people · 2019 | 6/25 | SYR4 |
| Selenium | 2.6 µg/L 5.2% of the EPA limit 50 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 1/25 | SYR4 |
| Di(2-ethylhexyl) Adipate | 2.205 µg/L 0.6% of the EPA limit 400 µg/L Highest in the city: FOX LAUREL MOBILE HOME PARK, LLC · 40 people · 2019 | 1/25 | SYR4 |
| Chromium | 2 µg/L 2% of the EPA limit 100 µg/L Highest in the city: SCWA, MOHEGAN DIVISION · 1,428 people · 2018 | 3/25 | SYR4 |
| Combined Radium (-226 And -228) | 1.09 pCi/L 22% of the EPA limit 5 pCi/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2017
Highest in the city: 1.6 pCi/L — OAKRIDGE GARDENS, LLC · 70 people · 2015 | 6/25 | SYR4 |
| Beryllium, Total | 0.4000 µg/L 10% of the EPA limit 4 µg/L Highest in the city: KITEMAUG ORCHARD ASSOCIATION, INC. · 490 people · 2019 | 8/25 | SYR4 |
| PFOS | 0.0162 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/25 | UCMR-5 |
| PFHXS | 0.0125 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/25 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2025
Highest in the city: 0.0076 mg/L — SCWA, OAKDALE HEIGHTS DIVISION · 876 people · 2025 | 25/25 | LCR |
| PFOA | 0.0067 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/25 | UCMR-5 |
| PFBS | 0.0060 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/25 | UCMR-5 |
| Pfpea | 0.0039 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/25 | UCMR-5 |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Montville
Frequently asked questions about Montville tap water
Is Montville tap water safe to drink?
EPA testing detected 32 contaminants in the water serving Montville. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Montville?
25 public water suppliers report drinking-water monitoring for Montville, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Montville's water?
The contaminants EPA monitoring detected in Montville include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Nitrite. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.