Is Stonington Water Company Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Hancock

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

149

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2023-07-01 → 2023-09-30
MCL	Health-based	Archived	2023-07-01 → 2023-09-30
MCL	Health-based	Archived	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2021-07-01 → 2021-09-30
MCL	Health-based	Resolved	2021-07-01 → 2021-09-30
MCL	Health-based	Resolved	2021-07-01 → 2021-09-30
MCL	Health-based	Resolved	2021-07-01 → 2021-09-30
MCL	Health-based	Resolved	2020-12-01 → 2020-12-31
MCL	Health-based	Resolved	2020-12-01 → 2020-12-31
MCL	Health-based	Resolved	2020-12-01 → 2020-12-31

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	620 µg/L 48% of the EPA limit 1300 µg/L worst single sample: 920 µg/L	88/88	SYR4	2012–2019
Lead	2.6 µg/L 17% of the EPA limit 15 µg/L worst single sample: 10 µg/L	61/88	SYR4	2012–2019
Bromodichloromethane	22.25 µg/L No EPA limit set worst single sample: 38 µg/L	36/36	SYR4	2012–2019
Chloroform	65 µg/L No EPA limit set worst single sample: 90 µg/L	36/36	SYR4	2012–2019
Dibromochloromethane	8.225 µg/L No EPA limit set worst single sample: 9.9 µg/L	36/36	SYR4	2012–2019
TTHM	89.98 µg/L 112% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 136 µg/L	33/33	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	36.5 µg/L 61% of the EPA limit 60 µg/L worst single sample: 85 µg/L	31/33	SYR4	2012–2019
Trichloroacetic Acid	25.6 µg/L No EPA limit set worst single sample: 56 µg/L	29/31	SYR4	2012–2019
Dichloroacetic Acid	14.2 µg/L No EPA limit set worst single sample: 29 µg/L	25/31	SYR4	2012–2019
Combined Uranium	27.85 µg/L 93% of the EPA limit 30 µg/L worst single sample: 28 µg/L	24/24	SYR4	2015–2019
Lead	0.0013 mg/L 8.7% of the EPA limit 0.0150 mg/L	18/18	LCR	2025
Nitrate	60 µg/L 0.6% of the EPA limit 10000 µg/L	14/16	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	37.025 pCi/L 247% of the EPA limit, at the 95th percentile of samples — 15 pCi/L worst single sample: 37.7 pCi/L	10/10	SYR4	2013–2019
Combined Radium (-226 And -228)	2.1724 pCi/L 43% of the EPA limit 5 pCi/L worst single sample: 2.39 pCi/L	9/9	SYR4	2014–2019
Barium	3.365 µg/L 0.2% of the EPA limit 2000 µg/L worst single sample: 3.4 µg/L	8/8	SYR4	2012–2019
Fluoride	465 µg/L 12% of the EPA limit 4000 µg/L worst single sample: 500 µg/L	8/8	SYR4	2012–2019
Chromium	2.125 µg/L 2.1% of the EPA limit 100 µg/L worst single sample: 2.3 µg/L	6/8	SYR4	2012–2019
Nitrate-Nitrite	60 µg/L 0.6% of the EPA limit 10000 µg/L	6/7	SYR4	2012–2019
Antimony, Total	0.5300 µg/L 8.8% of the EPA limit 6 µg/L	1/8	SYR4	2012–2019
Bromoform	1.1 µg/L No EPA limit set	1/36	SYR4	2012–2019
Dibromoacetic Acid	1.1 µg/L No EPA limit set	1/31	SYR4	2012–2019
Selenium	1.4 µg/L 2.8% of the EPA limit 50 µg/L	1/8	SYR4	2012–2019
Toluene	1.4 µg/L 0.1% of the EPA limit 1000 µg/L	1/10	SYR4	2012–2019

30 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-DichloropropaneArsenicBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideDichloromethaneEthylbenzeneMercuryMonobromoacetic AcidMonochloroacetic AcidNitriteStyreneTetrachloroethyleneThallium, TotalTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: HAFFORD, ANNALEIS
Phone: 207-223-2232
Email: [email protected]

Frequently asked questions about Stonington Water Company

Is Stonington Water Company tap water safe to drink?

EPA monitoring detected 23 contaminants in Stonington Water Company'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 Stonington Water Company's water?

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

How many people does Stonington Water Company serve?

Stonington Water Company reports serving 683 people in Maine, per its EPA record.

Has Stonington Water Company had any water quality violations?

The EPA has 149 violations on file for Stonington Water Company, of which 72 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.