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Tap water quality report

Groton Utilities

EPA monitoring tested this supplier for 105 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
13
detected
30,200
people served
0
health-based violations
Connecticut rankingsLead in ConnecticutPFAS in Connecticut
Water source
Surface water
Ownership
Local government
Counties served
New London

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
6
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2023-07-01
MR Monitoring Resolved 2020-03-31
MR Monitoring Resolved 2019-06-01 → 2019-06-30
MR Monitoring Resolved 2019-06-01 → 2019-06-30
MR Monitoring Resolved 2019-06-01 → 2019-06-30
MR Monitoring Resolved 2019-06-01 → 2019-06-30

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
Copper
103 µg/L 7.9%
of the EPA limit 1300 µg/L
worst single sample: 1200 µg/L
155/164 SYR4 2012–2019
TTHM
88.86 µg/L 111%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 102 µg/L
128/128 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
36.31 µg/L 61%
of the EPA limit 60 µg/L
worst single sample: 48.3 µg/L
128/128 SYR4 2012–2019
Chlorite
190 µg/L 19%
of the EPA limit 1000 µg/L
worst single sample: 210 µg/L
86/90 SYR4 2012–2019
Lead
54.8 µg/L 365%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 470 µg/L
49/164 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 43/43 LCR 2025
Barium
14.75 µg/L 0.7%
of the EPA limit 2000 µg/L
worst single sample: 17 µg/L
16/16 SYR4 2012–2019
Nitrate
88 µg/L 0.9%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Nitrate-Nitrite
93 µg/L 0.9%
of the EPA limit 10000 µg/L
worst single sample: 108 µg/L
16/16 SYR4 2012–2019
Fluoride
1038 µg/L 26%
of the EPA limit 4000 µg/L
worst single sample: 1220 µg/L
15/16 SYR4 2012–2019
Bromodichloromethane
7.615 µg/L
No EPA limit set
worst single sample: 8 µg/L
8/8 SYR4 2012–2019
Chloroform
15.715 µg/L
No EPA limit set
worst single sample: 16.1 µg/L
8/8 SYR4 2012–2019
Dibromochloromethane
1.965 µg/L
No EPA limit set
worst single sample: 2 µg/L
8/8 SYR4 2012–2019
92 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 EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GAUDET, RONALD
Phone
860-446-4091
Email
[email protected]

Frequently asked questions about Groton Utilities

Is Groton Utilities tap water safe to drink?

EPA monitoring detected 13 contaminants in Groton Utilities'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 Groton Utilities's water?

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

How many people does Groton Utilities serve?

Groton Utilities reports serving 30,200 people in Connecticut, per its EPA record.

Has Groton Utilities had any water quality violations?

The EPA has 6 violations on file for Groton Utilities, 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.