What was found in Lisbon'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: 4500 µg/L — ROUND HILL LLC - WELL# 1&2 · 72 people · 2019 | 6/6 | 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: 4460 µg/L — ROUND HILL LLC - WELL# 1&2 · 72 people · 2019 | 6/6 | SYR4 |
| Fluoride | 992 µg/L 25% of the EPA limit 4000 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 1/6 | SYR4 |
| Nitrite | 860 µg/L 86% of the EPA limit 1000 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 1/6 | 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: 341.395 µg/L — JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 6/6 | 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 | 3/6 | 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
Highest in the city: 75.24 µg/L — JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 3/6 | SYR4 |
| Chloroform | 50.5 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 70.12 µg/L — JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 3/6 | SYR4 |
| Trichloroacetic Acid | 40.35 µg/L No EPA limit set Highest in the city: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 2/6 | SYR4 |
| Dichloroacetic Acid | 32.9736 µg/L No EPA limit set Highest in the city: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 2/6 | 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: 18.8351 µg/L — TUNNEL HILL MOBILE HOME PARK · 40 people · 2019 | 6/6 | 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 | 6/6 | SYR4 |
| Bromodichloromethane | 7.65 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 3/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.3885 pCi/L 29% of the EPA limit 15 pCi/L Highest in the city: ROUND HILL LLC - WELL# 1&2 · 72 people · 2019 | 4/6 | SYR4 |
| Gross Beta Particle Activity | 3.74 pCi/L No EPA limit set Highest in the city: TUNNEL HILL MOBILE HOME PARK · 40 people · 2019 | 1/6 | SYR4 |
| Dibromochloromethane | 0.8725 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019
Highest in the city: 3.72 µg/L — JEWETT CITY WATER CO-HILL-N-DALE · 146 people · 2019 | 3/6 | SYR4 |
| Monochloroacetic Acid | 3.33 µg/L No EPA limit set Highest in the city: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 2/6 | SYR4 |
| Selenium | 2.6 µg/L 5.2% of the EPA limit 50 µg/L Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2019 | 1/6 | 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: 2 pCi/L — JEWETT CITY WATER CO-HILL-N-DALE · 146 people · 2018 | 5/6 | SYR4 |
| Dibromoacetic Acid | 1.62 µg/L No EPA limit set Highest in the city: JEWETT CITY WATER CO-HILL-N-DALE · 146 people · 2019 | 2/6 | SYR4 |
| Monobromoacetic Acid | 1.55 µg/L No EPA limit set Highest in the city: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 1/6 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Highest in the city: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 1/6 | SYR4 |
| Bromoform | 0.6170 µg/L No EPA limit set Highest in the city: JEWETT CITY WATER CO-HILL-N-DALE · 146 people · 2019 | 2/6 | SYR4 |
| 2,4-D | 0.1650 µg/L 0.2% of the EPA limit 70 µg/L Highest in the city: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 1/6 | SYR4 |
| PFOS | 0.0162 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/6 | UCMR-5 |
| PFHXS | 0.0125 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/6 | UCMR-5 |
| Pfba | 0.0121 µg/L No EPA limit set Highest in the city: JEWETT CITY WATER COMPANY · 6,840 people · 2023 | 1/6 | UCMR-5 |
| PFOA | 0.0067 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/6 | UCMR-5 |
| PFBS | 0.0060 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/6 | UCMR-5 |
| Pfpea | 0.0039 µg/L No EPA limit set Main supplier: NORWICH PUBLIC UTILITIES · 36,163 people · 2024 | 1/6 | 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: 0.0028 mg/L — ROUND HILL LLC - WELL# 1&2 · 72 people · 2024 | 6/6 | LCR |
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 Lisbon
| Supplier | Population served |
|---|---|
| NORWICH PUBLIC UTILITIES | 36,163 |
| JEWETT CITY WATER COMPANY | 6,840 |
| LISBON MOBILE HOMES | 155 |
| JEWETT CITY WATER CO-HILL-N-DALE | 146 |
| ROUND HILL LLC - WELL# 1&2 | 72 |
| TUNNEL HILL MOBILE HOME PARK | 40 |
Frequently asked questions about Lisbon tap water
Is Lisbon tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Lisbon. 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 Lisbon?
6 public water suppliers report drinking-water monitoring for Lisbon, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Lisbon's water?
The contaminants EPA monitoring detected in Lisbon include Nitrate, Nitrate-Nitrite, Fluoride, Nitrite, Copper. 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.