What was found in Bolton'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 |
|---|---|---|---|
| Fluoride | 447 µg/L 11% of the EPA limit 4000 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 4/5 | SYR4 |
| Copper | 289.15 µg/L 22% of the EPA limit 1300 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2018 | 5/5 | SYR4 |
| Nitrate | 20 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019
Highest in the city: 196.6 µg/L — SOUTHRIDGE PARK APARTMENTS · 50 people · 2019 | 5/5 | SYR4 |
| Nitrate-Nitrite | 20 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019
Highest in the city: 162.78999999999994 µg/L — SOUTHRIDGE PARK APARTMENTS · 50 people · 2019 | 5/5 | SYR4 |
| Barium | 34.7 µg/L 1.7% of the EPA limit 2000 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019
Highest in the city: 53.75 µg/L — COOK DRIVE ASSOCIATION · 49 people · 2016 | 4/5 | SYR4 |
| Nitrite | 16.25 µg/L 1.6% of the EPA limit 1000 µg/L Highest in the city: SOUTHRIDGE PARK APARTMENTS · 50 people · 2019 | 1/5 | SYR4 |
| Lead | 5.08 µg/L 34% of the EPA limit 15 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2018
Highest in the city: 15 µg/L — SUNSET APARTMENTS LLC · 46 people · 2019 | 5/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 10.9 pCi/L 73% of the EPA limit 15 pCi/L Highest in the city: COOK DRIVE ASSOCIATION · 49 people · 2019 | 3/5 | SYR4 |
| Combined Radium (-226 And -228) | 1.25 pCi/L 25% of the EPA limit 5 pCi/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2017
Highest in the city: 4.63 pCi/L — SOUTHRIDGE PARK APARTMENTS · 50 people · 2019 | 4/5 | SYR4 |
| TTHM | 3.715 µg/L 4.6% of the EPA limit 80 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Combined Uranium | 3.674 µg/L 12% of the EPA limit 30 µg/L Highest in the city: SOUTHRIDGE PARK APARTMENTS · 50 people · 2019 | 3/5 | SYR4 |
| Bromoform | 2.0599999999999996 µg/L No EPA limit set Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Dibromochloromethane | 1.625 µg/L No EPA limit set Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Antimony, Total | 1.2 µg/L 20% of the EPA limit 6 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Bromodichloromethane | 0.9365 µg/L No EPA limit set Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Chloroform | 0.9000 µg/L No EPA limit set Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Dibromoacetic Acid | 0.6000 µg/L No EPA limit set Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 0.6000 µg/L 1% of the EPA limit 60 µg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2019 | 1/5 | SYR4 |
| Mercury | 0.2000 µg/L 10% of the EPA limit 2 µg/L Highest in the city: COOK DRIVE ASSOCIATION · 49 people · 2016 | 1/5 | SYR4 |
| Lead | 0.0057 mg/L 38% of the EPA limit 0.0150 mg/L Main supplier: CTWC - NORTHERN REG-LLYNWOOD SYSTEM · 192 people · 2024
Highest in the city: 0.0116 mg/L — SUNSET APARTMENTS LLC · 46 people · 2023 | 5/5 | 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 Bolton
| Supplier | Population served |
|---|---|
| CTWC - NORTHERN REG-LLYNWOOD SYSTEM | 192 |
| 890 BOSTON TURNPIKE | 60 |
| SOUTHRIDGE PARK APARTMENTS | 50 |
| COOK DRIVE ASSOCIATION | 49 |
| SUNSET APARTMENTS LLC | 46 |
Frequently asked questions about Bolton tap water
Is Bolton tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Bolton. 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 Bolton?
5 public water suppliers report drinking-water monitoring for Bolton, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Bolton's water?
The contaminants EPA monitoring detected in Bolton include Fluoride, Copper, Nitrate, Nitrate-Nitrite, Barium. 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.