Tap WaterIndex

← Connecticut

Tap water quality report

Aquarion-Darien

EPA monitoring tested this supplier for 110 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

110
contaminants tested
21
detected
18,737
people served
0
health-based violations
Connecticut rankingsLead in ConnecticutPFAS in Connecticut
Water source
SWP
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.

0
health-based violations
4
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2018-07-01
Other Monitoring Resolved 2018-07-01
Other Monitoring Resolved 2006-07-01
Other Monitoring Resolved 2006-07-01

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFOA 0.0058 µg/L 3/8 2023
Pfpea 0.0033 µg/L 2/8 2023
Pfba 0.0055 µg/L 1/8 2023
Pfhxa 0.0037 µg/L 1/8 2023

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Dibromochloromethane
6 µg/L
No EPA limit set
worst single sample: 7 µg/L
147/148 SYR4 2012–2019
Bromodichloromethane
14 µg/L
No EPA limit set
worst single sample: 15 µg/L
132/148 SYR4 2012–2019
TTHM
71.45 µg/L 89%
of the EPA limit 80 µg/L
worst single sample: 90 µg/L
132/132 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
49.9 µg/L 83%
of the EPA limit 60 µg/L
worst single sample: 68 µg/L
132/132 SYR4 2012–2019
Chloroform
56.6 µg/L
No EPA limit set
worst single sample: 73 µg/L
129/148 SYR4 2012–2019
Dichloroacetic Acid
22 µg/L
No EPA limit set
worst single sample: 27 µg/L
129/132 SYR4 2012–2019
Trichloroacetic Acid
26.6 µg/L
No EPA limit set
worst single sample: 40 µg/L
129/132 SYR4 2012–2019
Monochloroacetic Acid
2 µg/L
No EPA limit set
worst single sample: 3 µg/L
114/132 SYR4 2012–2019
Copper
329.5 µg/L 25%
of the EPA limit 1300 µg/L
worst single sample: 1060 µg/L
62/62 SYR4 2013–2017
Dibromoacetic Acid
2 µg/L
No EPA limit set
 60/132 SYR4 2012–2019
Bromoform
3 µg/L
No EPA limit set
worst single sample: 4 µg/L
50/148 SYR4 2012–2019
Lead
15.35 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 117 µg/L
20/62 SYR4 2013–2017
Nitrate
2830 µg/L 28%
of the EPA limit 10000 µg/L
 18/18 SYR4 2012–2018
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2023
Nitrate-Nitrite
2744.8 µg/L 27%
of the EPA limit 10000 µg/L
worst single sample: 2830 µg/L
9/9 SYR4 2012–2018
Barium
51.9 µg/L 2.6%
of the EPA limit 2000 µg/L
worst single sample: 52 µg/L
2/2 SYR4 2013–2015
Fluoride
970 µg/L 24%
of the EPA limit 4000 µg/L
worst single sample: 980 µg/L
2/2 SYR4 2013–2015
89 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, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, 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-Darien

Is Aquarion-Darien tap water safe to drink?

EPA monitoring detected 21 contaminants in Aquarion-Darien'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-Darien's water?

EPA monitoring detected Dibromochloromethane, Bromodichloromethane, TTHM, Total Haloacetic Acids (HAA5), Chloroform, and others. The full list with the level and data source for each is above.

How many people does Aquarion-Darien serve?

Aquarion-Darien reports serving 18,737 people in Connecticut, per its EPA record.

Has Aquarion-Darien had any water quality violations?

The EPA has 4 violations on file for Aquarion-Darien, 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.