Is Regional Water Authority Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: New Haven

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2020-12-30
MR	Monitoring	Archived	2017-01-01 → 2017-03-31
Other	Monitoring	Resolved	2015-08-10
Other	Monitoring	Resolved	2015-08-10
MR	Monitoring	Resolved	2015-01-01 → 2015-12-31
MR	Monitoring	Resolved	2015-01-01 → 2015-12-31
MR	Monitoring	Resolved	2015-01-01 → 2015-12-31
MR	Monitoring	Resolved	2015-01-01 → 2015-12-31
MR	Monitoring	Resolved	2015-01-01 → 2015-12-31
MR	Monitoring	Resolved	2015-01-01 → 2015-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
PFOS	0.0107 µg/L	7/30	2024
PFOA	0.0071 µg/L	4/30	2024
PFBS	0.0035 µg/L	3/30	2024
Pfpea	0.0031 µg/L	1/30	2024

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	270 µg/L 21% of the EPA limit 1300 µg/L worst single sample: 1550 µg/L	1666/2856	SYR4	2012–2019
Bromodichloromethane	13.39 µg/L No EPA limit set worst single sample: 24.6 µg/L	443/484	SYR4	2012–2019
Chloroform	70.9 µg/L No EPA limit set worst single sample: 96 µg/L	441/484	SYR4	2012–2019
TTHM	81.905 µg/L 102% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 122.7 µg/L	400/400	SYR4	2012–2019
Dichloroacetic Acid	21.85 µg/L No EPA limit set worst single sample: 28.7 µg/L	396/400	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	57.575 µg/L 96% of the EPA limit 60 µg/L worst single sample: 72.9 µg/L	396/400	SYR4	2012–2019
Trichloroacetic Acid	31.09 µg/L No EPA limit set worst single sample: 45.3 µg/L	392/400	SYR4	2012–2019
Dibromochloromethane	3.2 µg/L No EPA limit set worst single sample: 5.5 µg/L	378/484	SYR4	2012–2019
Monochloroacetic Acid	6.1 µg/L No EPA limit set worst single sample: 10.4 µg/L	362/400	SYR4	2012–2019
Nitrate-Nitrite	3227.6 µg/L 32% of the EPA limit 10000 µg/L worst single sample: 10300 µg/L	207/208	SYR4	2012–2019
Barium	246.8 µg/L 12% of the EPA limit 2000 µg/L worst single sample: 301 µg/L	205/205	SYR4	2012–2019
Fluoride	1020 µg/L 26% of the EPA limit 4000 µg/L worst single sample: 2320 µg/L	205/205	SYR4	2012–2019
Nitrate	3102 µg/L 31% of the EPA limit 10000 µg/L worst single sample: 3715 µg/L	166/170	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	111/111	LCR	2026
Dibromoacetic Acid	0.8000 µg/L No EPA limit set worst single sample: 1.5 µg/L	60/400	SYR4	2012–2019
Lead	44.2 µg/L 295% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 656 µg/L	49/2854	SYR4	2012–2019
Chromium	1.5 µg/L 1.5% of the EPA limit 100 µg/L worst single sample: 2 µg/L	11/205	SYR4	2012–2019
Bromoform	0.7500 µg/L No EPA limit set worst single sample: 0.8000 µg/L	6/484	SYR4	2012–2019
Combined Radium (-226 And -228)	1.549 pCi/L 31% of the EPA limit 5 pCi/L worst single sample: 1.55 pCi/L	3/15	SYR4	2013–2019
Nitrite	442.2 µg/L 44% of the EPA limit 1000 µg/L worst single sample: 448 µg/L	3/85	SYR4	2012–2019
Gross Beta Particle Activity	8.5 pCi/L No EPA limit set	2/4	SYR4	2013–2019

86 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, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromateChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: BARGER, THOMAS C.
Phone: 203-401-2710
Email: [email protected]

Frequently asked questions about Regional Water Authority

Is Regional Water Authority tap water safe to drink?

EPA monitoring detected 25 contaminants in Regional Water Authority'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 Regional Water Authority's water?

EPA monitoring detected Copper, Bromodichloromethane, Chloroform, TTHM, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Regional Water Authority serve?

Regional Water Authority reports serving 418,900 people in Connecticut, per its EPA record.

Has Regional Water Authority had any water quality violations?

The EPA has 57 violations on file for Regional Water Authority, of which 0 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.