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.
3
health-based violations
61
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Archived | 2026-02-01 → 2026-02-28 |
| TT | Health-based | Archived | 2026-02-01 → 2026-02-28 |
| TT | Health-based | Archived | 2026-02-01 → 2026-02-28 |
| Other | Monitoring | Resolved | 2021-08-10 |
| Other | Monitoring | Resolved | 2021-07-01 |
| Other | Monitoring | Resolved | 2020-07-01 |
| MR | Monitoring | Archived | 2019-01-01 → 2021-12-31 |
| MR | Monitoring | Archived | 2019-01-01 → 2021-12-31 |
| MR | Monitoring | Archived | 2019-01-01 → 2021-12-31 |
| MR | Monitoring | Archived | 2019-01-01 → 2021-12-31 |
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 |
|---|---|---|---|---|
| Dibromochloromethane | 5.9 µg/L No EPA limit set
worst single sample: 7.3 µg/L | 141/178 | SYR4 | 2012–2019 |
| Bromodichloromethane | 4.85 µg/L No EPA limit set
worst single sample: 7.6 µg/L | 116/178 | SYR4 | 2012–2019 |
| TTHM | 16.55 µg/L 21% of the EPA limit 80 µg/L
worst single sample: 22 µg/L | 111/114 | SYR4 | 2012–2019 |
| Bromoform | 3.59 µg/L No EPA limit set
worst single sample: 7.4 µg/L | 103/178 | SYR4 | 2012–2019 |
| Copper | 782.85 µg/L 60% of the EPA limit 1300 µg/L
worst single sample: 977 µg/L | 88/90 | SYR4 | 2013–2019 |
| Chloroform | 3.805 µg/L No EPA limit set
worst single sample: 4.5 µg/L | 80/178 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 7.45 µg/L 149% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 9 µg/L | 66/128 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 6.495 µg/L 11% of the EPA limit 60 µg/L
worst single sample: 8.8 µg/L | 62/114 | SYR4 | 2012–2019 |
| Trichloroethylene | 6.1 µg/L 122% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 6.5 µg/L | 58/128 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.84 µg/L No EPA limit set
worst single sample: 3.4 µg/L | 53/114 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 2.1 µg/L No EPA limit set
worst single sample: 2.8 µg/L | 42/114 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 2.85 µg/L 4.1% of the EPA limit 70 µg/L
worst single sample: 3.5 µg/L | 39/128 | SYR4 | 2012–2019 |
| Nitrate | 2389 µg/L 24% of the EPA limit 10000 µg/L
worst single sample: 2510 µg/L | 32/32 | SYR4 | 2012–2019 |
| Lead | 6.16 µg/L 41% of the EPA limit 15 µg/L
worst single sample: 8 µg/L | 25/90 | SYR4 | 2013–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 16/16 | LCR | 2025 |
| Nitrate-Nitrite | 2345 µg/L 23% of the EPA limit 10000 µg/L
worst single sample: 2510 µg/L | 16/16 | SYR4 | 2012–2019 |
| 1,1,1-Trichloroethane | 0.5685 µg/L 0.3% of the EPA limit 200 µg/L
worst single sample: 0.6000 µg/L | 8/128 | SYR4 | 2012–2019 |
| Barium | 451.495 µg/L 23% of the EPA limit 2000 µg/L
worst single sample: 460 µg/L | 6/6 | SYR4 | 2012–2017 |
| Fluoride | 967.5 µg/L 24% of the EPA limit 4000 µg/L
worst single sample: 990 µg/L | 6/6 | SYR4 | 2012–2017 |
| Trichloroacetic Acid | 1.07 µg/L No EPA limit set
worst single sample: 1.1 µg/L | 2/114 | SYR4 | 2012–2019 |
| Lithium | 11.8 µg/L No EPA limit set | 2/4 | UCMR-5 | 2023 |
| 1,1,2-Trichloroethane | 0.6300 µg/L 13% of the EPA limit 5 µg/L | 1/128 | SYR4 | 2012–2019 |
| 1,2,4-Trichlorobenzene | 2 µg/L 2.9% of the EPA limit 70 µg/L | 1/128 | SYR4 | 2012–2019 |
| Combined Uranium | 1.7 µg/L 5.7% of the EPA limit 30 µg/L | 1/6 | SYR4 | 2013–2019 |
| Gross Alpha, Excl. Radon And U | 7.03 pCi/L 47% of the EPA limit 15 pCi/L | 1/6 | SYR4 | 2013–2019 |
82 contaminants tested, none detected
1,1-Dichloroethylene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Aquarion-Plainville Regional
Is Aquarion-Plainville Regional tap water safe to drink?
EPA monitoring detected 28 contaminants in Aquarion-Plainville Regional'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 Aquarion-Plainville Regional's water?
EPA monitoring detected Dibromochloromethane, Bromodichloromethane, TTHM, Bromoform, Copper, and others. The full list with the level and data source for each is above.
How many people does Aquarion-Plainville Regional serve?
Aquarion-Plainville Regional reports serving 18,231 people in Connecticut, per its EPA record.
Has Aquarion-Plainville Regional had any water quality violations?
The EPA has 61 violations on file for Aquarion-Plainville Regional, of which 3 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.