Is Aquarion-Greenwich Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Private
Counties served: Fairfield

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

106

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Resolved	2009-06-01 → 2009-06-30
TT	Health-based	Resolved	2009-06-01 → 2009-06-30
TT	Health-based	Resolved	2009-06-01 → 2009-06-30
TT	Health-based	Resolved	2009-06-01 → 2009-06-30
MCL	Health-based	Archived	1979-10-31 → 1979-11-30
MR	Monitoring	Resolved	2024-06-01 → 2024-06-30
MR	Monitoring	Resolved	2024-06-01 → 2024-06-30
MR	Monitoring	Resolved	2024-06-01 → 2024-06-30
MR	Monitoring	Resolved	2024-06-01 → 2024-06-30
MR	Monitoring	Resolved	2019-12-30

PFAS detected

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

Contaminant	Max	Detection rate	Period
PFOA	0.0056 µg/L	11/12	2025
Pfhxa	0.0040 µg/L	6/12	2025
PFOS	0.0041 µg/L	2/12	2025
Pfpea	0.0038 µg/L	2/12	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
Bromodichloromethane	19 µg/L No EPA limit set worst single sample: 22 µg/L	271/271	SYR4	2012–2019
Chloroform	66 µg/L No EPA limit set worst single sample: 89 µg/L	271/271	SYR4	2012–2019
Dibromochloromethane	4 µg/L No EPA limit set worst single sample: 5 µg/L	271/271	SYR4	2012–2019
Dichloroacetic Acid	29 µg/L No EPA limit set worst single sample: 52 µg/L	256/256	SYR4	2012–2019
TTHM	84.25 µg/L 105% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 104 µg/L	256/256	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	61.25 µg/L 102% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 110 µg/L	256/256	SYR4	2012–2019
Trichloroacetic Acid	31 µg/L No EPA limit set worst single sample: 53 µg/L	256/256	SYR4	2012–2019
Monochloroacetic Acid	3 µg/L No EPA limit set worst single sample: 4 µg/L	234/256	SYR4	2012–2019
Dibromoacetic Acid	1 µg/L No EPA limit set worst single sample: 2 µg/L	189/256	SYR4	2012–2019
Copper	407.5 µg/L 31% of the EPA limit 1300 µg/L worst single sample: 780 µg/L	136/158	SYR4	2012–2019
Chlorite	631.5 µg/L 63% of the EPA limit 1000 µg/L worst single sample: 810 µg/L	98/99	SYR4	2013–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	67/67	LCR	2026
Nitrate	533.3 µg/L 5.3% of the EPA limit 10000 µg/L worst single sample: 545 µg/L	34/34	SYR4	2012–2019
Lead	7 µg/L 47% of the EPA limit 15 µg/L worst single sample: 10 µg/L	33/158	SYR4	2012–2019
Nitrate-Nitrite	534.2 µg/L 5.3% of the EPA limit 10000 µg/L worst single sample: 549 µg/L	33/33	SYR4	2012–2019
Barium	46.45 µg/L 2.3% of the EPA limit 2000 µg/L worst single sample: 48 µg/L	32/32	SYR4	2012–2019
Fluoride	895 µg/L 22% of the EPA limit 4000 µg/L worst single sample: 1010 µg/L	31/32	SYR4	2012–2019
Monobromoacetic Acid	1 µg/L No EPA limit set	28/256	SYR4	2012–2019

88 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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: ULRICH, ROBERT J.
Phone: 203-926-4320
Email: [email protected]

Frequently asked questions about Aquarion-Greenwich

Is Aquarion-Greenwich tap water safe to drink?

EPA monitoring detected 22 contaminants in Aquarion-Greenwich'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-Greenwich's water?

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

How many people does Aquarion-Greenwich serve?

Aquarion-Greenwich reports serving 53,297 people in Connecticut, per its EPA record.

Has Aquarion-Greenwich had any water quality violations?

The EPA has 106 violations on file for Aquarion-Greenwich, of which 5 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.