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.
0
health-based violations
400
violations on file
1
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| Other | Monitoring | Resolved | 2024-12-14 |
| Other | Monitoring | Unaddressed | 2018-06-08 |
| MR | Monitoring | Resolved | 2014-07-16 |
| MR | Monitoring | Resolved | 2014-07-16 |
| MR | Monitoring | Resolved | 2014-07-01 → 2014-07-31 |
| MR | Monitoring | Resolved | 2014-07-01 → 2014-07-31 |
| MR | Monitoring | Resolved | 2014-01-01 → 2016-12-31 |
| MR | Monitoring | Resolved | 2014-01-01 → 2016-12-31 |
| MR | Monitoring | Resolved | 2014-01-01 → 2016-12-31 |
| MR | Monitoring | Resolved | 2014-01-01 → 2016-12-31 |
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 |
|---|---|---|---|---|
| Copper | 231.4 µg/L 18% of the EPA limit 1300 µg/L
worst single sample: 603 µg/L | 507/515 | SYR4 | 2012–2019 |
| Dibromochloromethane | 6 µg/L No EPA limit set
worst single sample: 7.8 µg/L | 336/389 | SYR4 | 2012–2019 |
| Bromodichloromethane | 15 µg/L No EPA limit set
worst single sample: 18.3 µg/L | 335/389 | SYR4 | 2012–2019 |
| Chloroform | 62.44 µg/L No EPA limit set
worst single sample: 89.1 µg/L | 333/389 | SYR4 | 2012–2019 |
| TTHM | 80.8 µg/L 101% of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 107.6 µg/L | 326/331 | SYR4 | 2012–2019 |
| Nitrate | 5977 µg/L 60% of the EPA limit 10000 µg/L
worst single sample: 7650 µg/L | 318/326 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 27 µg/L 45% of the EPA limit 60 µg/L
worst single sample: 36 µg/L | 311/326 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 13.25 µg/L No EPA limit set
worst single sample: 19 µg/L | 296/326 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 14 µg/L No EPA limit set
worst single sample: 20 µg/L | 291/326 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 5938 µg/L 59% of the EPA limit 10000 µg/L
worst single sample: 7650 µg/L | 167/170 | SYR4 | 2012–2019 |
| Lead | 72.1 µg/L 481% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 227 µg/L | 163/515 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set
worst single sample: 3 µg/L | 91/326 | SYR4 | 2012–2019 |
| Bromoform | 2.03 µg/L No EPA limit set
worst single sample: 3.7 µg/L | 78/389 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 59/59 | LCR | 2026 |
| Barium | 346.8 µg/L 17% of the EPA limit 2000 µg/L
worst single sample: 407 µg/L | 40/46 | SYR4 | 2012–2019 |
| Fluoride | 1076 µg/L 27% of the EPA limit 4000 µg/L
worst single sample: 1640 µg/L | 33/46 | SYR4 | 2012–2019 |
| Arsenic | 5.25 µg/L 53% of the EPA limit 10 µg/L
worst single sample: 5.5 µg/L | 11/46 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 2.9 pCi/L 58% of the EPA limit 5 pCi/L
worst single sample: 3.1 pCi/L | 11/38 | SYR4 | 2012–2018 |
| Combined Uranium | 5.455 µg/L 18% of the EPA limit 30 µg/L
worst single sample: 5.7 µg/L | 8/60 | SYR4 | 2012–2018 |
| Monochloroacetic Acid | 1.295 µg/L No EPA limit set
worst single sample: 1.4 µg/L | 8/326 | SYR4 | 2012–2019 |
| Nitrite | 55.9 µg/L 5.6% of the EPA limit 1000 µg/L
worst single sample: 76 µg/L | 7/163 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon And U | 5.4035 pCi/L 36% of the EPA limit 15 pCi/L
worst single sample: 5.45 pCi/L | 4/38 | SYR4 | 2012–2018 |
| Trichloroethylene | 0.9970 µg/L 20% of the EPA limit 5 µg/L
worst single sample: 1 µg/L | 4/58 | SYR4 | 2012–2019 |
| Selenium | 2 µg/L 4% of the EPA limit 50 µg/L | 3/46 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 0.7065 µg/L 14% of the EPA limit 5 µg/L
worst single sample: 0.7100 µg/L | 2/58 | SYR4 | 2012–2019 |
| Lithium | 19.8 µg/L No EPA limit set | 2/16 | UCMR-5 | 2025 |
| Benzo(A)Pyrene | 0.0630 µg/L 32% of the EPA limit 0.2000 µg/L | 1/66 | SYR4 | 2013–2019 |
| Cyanide | 5 µg/L 2.5% of the EPA limit 200 µg/L | 1/46 | SYR4 | 2012–2019 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L | 1/46 | SYR4 | 2012–2019 |
75 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-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Ctwc - Northern Reg-Western
Is Ctwc - Northern Reg-Western tap water safe to drink?
EPA monitoring detected 36 contaminants in Ctwc - Northern Reg-Western'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 Ctwc - Northern Reg-Western's water?
EPA monitoring detected Copper, Dibromochloromethane, Bromodichloromethane, Chloroform, TTHM, and others. The full list with the level and data source for each is above.
How many people does Ctwc - Northern Reg-Western serve?
Ctwc - Northern Reg-Western reports serving 101,313 people in Connecticut, per its EPA record.
Has Ctwc - Northern Reg-Western had any water quality violations?
The EPA has 400 violations on file for Ctwc - Northern Reg-Western, of which 0 are health-based (a contaminant limit or required treatment was breached) and 1 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.