What was found in Wallingford's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 10300 µg/L 103% of the EPA limit, in the worst sample — 10000 µg/L | 3/3 | SYR4 |
| Nitrate | 3970 µg/L 40% of the EPA limit 10000 µg/L | 3/3 | SYR4 |
| Fluoride | 2320 µg/L 58% of the EPA limit 4000 µg/L | 3/3 | SYR4 |
| Copper | 1550 µg/L 119% of the EPA limit, in the worst sample — 1300 µg/L | 3/3 | SYR4 |
| Barium | 664 µg/L 33% of the EPA limit 2000 µg/L | 3/3 | SYR4 |
| Lead | 656 µg/L 4373% of the EPA limit, in the worst sample — 15 µg/L | 3/3 | SYR4 |
| Nitrite | 448 µg/L 45% of the EPA limit 1000 µg/L | 3/3 | SYR4 |
| TTHM | 122.7 µg/L 153% of the EPA limit, in the worst sample — 80 µg/L | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 108 µg/L 180% of the EPA limit, in the worst sample — 60 µg/L | 3/3 | SYR4 |
| Chloroform | 98 µg/L No EPA limit set | 3/3 | SYR4 |
| Trichloroacetic Acid | 59 µg/L No EPA limit set | 3/3 | SYR4 |
| Dichloroacetic Acid | 29 µg/L No EPA limit set | 3/3 | SYR4 |
| Bromodichloromethane | 24.6 µg/L No EPA limit set | 3/3 | SYR4 |
| Monochloroacetic Acid | 10.4 µg/L No EPA limit set | 3/3 | SYR4 |
| Gross Beta Particle Activity | 8.5 pCi/L No EPA limit set | 1/3 | SYR4 |
| Dibromochloromethane | 7.2 µg/L No EPA limit set | 3/3 | SYR4 |
| Arsenic | 6 µg/L 60% of the EPA limit 10 µg/L | 2/3 | SYR4 |
| Cyanide | 5 µg/L 2.5% of the EPA limit 200 µg/L | 1/3 | SYR4 |
| Monobromoacetic Acid | 4.5 µg/L No EPA limit set | 1/3 | SYR4 |
| Bromoform | 2.9 µg/L No EPA limit set | 3/3 | SYR4 |
| Dibromoacetic Acid | 2.5 µg/L No EPA limit set | 2/3 | SYR4 |
| Chromium | 2 µg/L 2% of the EPA limit 100 µg/L | 2/3 | SYR4 |
| Combined Uranium | 2 µg/L 6.7% of the EPA limit 30 µg/L | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.7 pCi/L 34% of the EPA limit 5 pCi/L | 2/3 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L | 1/3 | SYR4 |
| Trichloroethylene | 0.5400 µg/L 11% of the EPA limit 5 µg/L | 2/3 | SYR4 |
| 1,1,1-Trichloroethane | 0.5000 µg/L 0.3% of the EPA limit 200 µg/L | 1/3 | SYR4 |
| 1,1,2-Trichloroethane | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| 1,1-Dichloroethylene | 0.5000 µg/L 7.1% of the EPA limit 7 µg/L | 1/3 | SYR4 |
| 1,2,4-Trichlorobenzene | 0.5000 µg/L 0.7% of the EPA limit 70 µg/L | 1/3 | SYR4 |
| 1,2-Dichloroethane | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| 1,2-Dichloropropane | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Benzene | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Chlorobenzene | 0.5000 µg/L 0.5% of the EPA limit 100 µg/L | 1/3 | SYR4 |
| Carbon Tetrachloride | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Dichloromethane | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Ethylbenzene | 0.5000 µg/L 0.1% of the EPA limit 700 µg/L | 1/3 | SYR4 |
| Styrene | 0.5000 µg/L 0.5% of the EPA limit 100 µg/L | 1/3 | SYR4 |
| Tetrachloroethylene | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/3 | SYR4 |
| Toluene | 0.5000 µg/L 0.1% of the EPA limit 1000 µg/L | 1/3 | SYR4 |
| Vinyl Chloride | 0.5000 µg/L 25% of the EPA limit 2 µg/L | 1/3 | SYR4 |
| cis-1,2-Dichloroethylene | 0.5000 µg/L 0.7% of the EPA limit 70 µg/L | 1/3 | SYR4 |
| O-Dichlorobenzene | 0.5000 µg/L 0.1% of the EPA limit 600 µg/L | 1/3 | SYR4 |
| P-Dichlorobenzene | 0.5000 µg/L 0.7% of the EPA limit 75 µg/L | 1/3 | SYR4 |
| trans-1,2-Dichloroethylene | 0.5000 µg/L 0.5% of the EPA limit 100 µg/L | 1/3 | SYR4 |
| Beryllium, Total | 0.1000 µg/L 2.5% of the EPA limit 4 µg/L | 1/3 | SYR4 |
| PFOS | 0.0139 µg/L No EPA limit set | 3/3 | UCMR-5 |
| PFHXS | 0.0107 µg/L No EPA limit set | 2/3 | UCMR-5 |
| PFOA | 0.0071 µg/L No EPA limit set | 2/3 | UCMR-5 |
| Pfhxa | 0.0058 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Pfba | 0.0050 µg/L No EPA limit set | 1/3 | UCMR-5 |
| Pfpea | 0.0048 µg/L No EPA limit set | 2/3 | UCMR-5 |
| PFBS | 0.0040 µg/L No EPA limit set | 3/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 3/3 | 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 single worst sample on
record — 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 Wallingford
| Supplier | Population served |
|---|---|
| REGIONAL WATER AUTHORITY | 418,900 |
| MERIDEN WATER DIVISION | 58,441 |
| WALLINGFORD WATER DEPARTMENT | 37,267 |
Frequently asked questions about Wallingford tap water
Is Wallingford tap water safe to drink?
EPA testing detected 54 contaminants in the water serving Wallingford. 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 Wallingford?
3 public water suppliers report drinking-water monitoring for Wallingford, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Wallingford's water?
The contaminants EPA monitoring detected in Wallingford include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. The full list, with the highest level found 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.