Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
10
health-based violations
115
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2005-09-01 → 2005-09-30 |
| MCL | Health-based | Resolved | 2005-09-01 → 2005-09-30 |
| MCL | Health-based | Resolved | 2005-09-01 → 2005-09-30 |
| MCL | Health-based | Resolved | 2005-09-01 → 2005-09-30 |
| MCL | Health-based | Resolved | 1992-01-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-01-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-01-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-01-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-01-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-01-01 → 1992-12-31 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
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 this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 10200 µg/L 102% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 12200 µg/L | 220/226 | SYR4 | 2012–2019 |
| Dibromochloromethane | 4.065 µg/L No EPA limit set
worst single sample: 5.5 µg/L | 128/179 | SYR4 | 2012–2019 |
| TTHM | 13.8 µg/L 17% of the EPA limit 80 µg/L
worst single sample: 19.8 µg/L | 126/129 | SYR4 | 2012–2019 |
| Bromodichloromethane | 4.47 µg/L No EPA limit set
worst single sample: 6.6 µg/L | 124/179 | SYR4 | 2012–2019 |
| Bromoform | 2 µg/L No EPA limit set
worst single sample: 3.1 µg/L | 112/179 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 10155 µg/L 102% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 12200 µg/L | 110/113 | SYR4 | 2012–2019 |
| Chloroform | 5.325 µg/L No EPA limit set
worst single sample: 9.1 µg/L | 108/179 | SYR4 | 2012–2019 |
| Copper | 432.7 µg/L 33% of the EPA limit 1300 µg/L
worst single sample: 518 µg/L | 95/95 | SYR4 | 2012–2018 |
| Total Haloacetic Acids (HAA5) | 6.185 µg/L 10% of the EPA limit 60 µg/L
worst single sample: 12.7 µg/L | 64/128 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.135 µg/L No EPA limit set
worst single sample: 3 µg/L | 54/128 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 3.103 µg/L No EPA limit set
worst single sample: 4 µg/L | 40/128 | SYR4 | 2012–2019 |
| Lead | 9.845 µg/L 66% of the EPA limit 15 µg/L
worst single sample: 19.5 µg/L | 32/95 | SYR4 | 2012–2018 |
| Trichloroethylene | 0.7680 µg/L 15% of the EPA limit 5 µg/L
worst single sample: 0.8100 µg/L | 25/50 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 2.549 µg/L No EPA limit set
worst single sample: 4.3 µg/L | 18/128 | SYR4 | 2012–2019 |
| Barium | 312.55 µg/L 16% of the EPA limit 2000 µg/L
worst single sample: 334 µg/L | 12/12 | SYR4 | 2014–2017 |
| Lead | 0.00070 mg/L 4.7% of the EPA limit 0.0150 mg/L | 12/12 | LCR | 2024 |
| Arsenic | 3.216 µg/L 32% of the EPA limit 10 µg/L
worst single sample: 3.3 µg/L | 5/12 | SYR4 | 2014–2017 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L | 2/12 | SYR4 | 2014–2017 |
| Combined Radium (-226 And -228) | 5.9055 pCi/L 118% of the EPA limit, at the 95th percentile of samples — 5 pCi/L
worst single sample: 6.1 pCi/L | 2/19 | SYR4 | 2014–2019 |
| Gross Alpha, Excl. Radon And U | 6.4045 pCi/L 43% of the EPA limit 15 pCi/L
worst single sample: 6.43 pCi/L | 2/19 | SYR4 | 2014–2019 |
| Antimony, Total | 0.2800 µg/L 4.7% of the EPA limit 6 µg/L | 1/12 | SYR4 | 2014–2017 |
| Nitrite | 59 µg/L 5.9% of the EPA limit 1000 µg/L | 1/113 | SYR4 | 2012–2019 |
83 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Hazardville Water Company
Is Hazardville Water Company tap water safe to drink?
EPA monitoring detected 28 contaminants in Hazardville Water Company's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Hazardville Water Company's water?
EPA monitoring detected Nitrate, Dibromochloromethane, TTHM, Bromodichloromethane, Bromoform, and others. The full list with the level and data source for each is above.
How many people does Hazardville Water Company serve?
Hazardville Water Company reports serving 18,544 people in Connecticut, per its EPA record.
Has Hazardville Water Company had any water quality violations?
The EPA has 115 violations on file for Hazardville Water Company, of which 10 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
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.