What was found in Canton'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 | 382.25 µg/L 3.8% of the EPA limit 10000 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019
Highest in the city: 2100 µg/L — 298-302 ALBANY TURNPIKE · 28 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 316.25 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019
Highest in the city: 2075 µg/L — 298-302 ALBANY TURNPIKE · 28 people · 2019 | 2/2 | SYR4 |
| Fluoride | 182.15 µg/L 4.6% of the EPA limit 4000 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Copper | 163.2 µg/L 13% of the EPA limit 1300 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 2/2 | SYR4 |
| TTHM | 52.637 µg/L 66% of the EPA limit 80 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Chloroform | 44.725 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29.15 µg/L 49% of the EPA limit 60 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 22.52 µg/L 75% of the EPA limit 30 µg/L Highest in the city: 298-302 ALBANY TURNPIKE · 28 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 19 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Lead | 17.5 µg/L 117% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 2/2 | SYR4 |
| Barium | 12.325 µg/L 0.6% of the EPA limit 2000 µg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 12.15 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 6.95 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.1 pCi/L 27% of the EPA limit 15 pCi/L Highest in the city: 298-302 ALBANY TURNPIKE · 28 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.327 pCi/L 27% of the EPA limit 5 pCi/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2018 | 1/2 | SYR4 |
| Monochloroacetic Acid | 0.8700 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 0.8415 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2019 | 1/2 | SYR4 |
| PFOS | 0.0056 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2023 | 1/2 | UCMR-5 |
| PFOA | 0.0049 µg/L No EPA limit set Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2023 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CTWC - NAUGATUCK REG-COLLINSVILLE SYS · 6,324 people · 2025
Highest in the city: 0.00080 mg/L — 298-302 ALBANY TURNPIKE · 28 people · 2024 | 2/2 | 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 Canton
| Supplier | Population served |
|---|---|
| CTWC - NAUGATUCK REG-COLLINSVILLE SYS | 6,324 |
| 298-302 ALBANY TURNPIKE | 28 |
Frequently asked questions about Canton tap water
Is Canton tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Canton. 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 Canton?
2 public water suppliers report drinking-water monitoring for Canton, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Canton's water?
The contaminants EPA monitoring detected in Canton include Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM. 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.