Is Castine, ME Tap Water Safe? Quality & Contaminants

What was found in Castine's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	1335 µg/L 13% of the EPA limit 10000 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Nitrate-Nitrite	929.5 µg/L 9.3% of the EPA limit 10000 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Copper	294 µg/L 23% of the EPA limit 1300 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	2/2	SYR4
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019 Highest in the city: 260 µg/L — HANCOCK VILLAGE MHP · 73 people · 2017	2/2	SYR4
TTHM	20.82 µg/L 26% of the EPA limit 80 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Barium	15 µg/L 0.8% of the EPA limit 2000 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Gross Alpha, Excl. Radon And U	5.733 pCi/L 38% of the EPA limit 15 pCi/L Highest in the city: HANCOCK VILLAGE MHP · 73 people · 2019	1/2	SYR4
Bromodichloromethane	5.55 µg/L No EPA limit set Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Dibromochloromethane	5.5 µg/L No EPA limit set Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Chloroform	5.4 µg/L No EPA limit set Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Bromoform	4.54 µg/L No EPA limit set Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Lead	4.36 µg/L 29% of the EPA limit 15 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Combined Radium (-226 And -228)	1.4082 pCi/L 28% of the EPA limit 5 pCi/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019 Highest in the city: 3.8518 pCi/L — HANCOCK VILLAGE MHP · 73 people · 2019	2/2	SYR4
Total Haloacetic Acids (HAA5)	2.8 µg/L 4.7% of the EPA limit 60 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Arsenic	2.3025 µg/L 23% of the EPA limit 10 µg/L Highest in the city: HANCOCK VILLAGE MHP · 73 people · 2017	1/2	SYR4
Chromium	1.88 µg/L 1.9% of the EPA limit 100 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Combined Uranium	1.868 µg/L 6.2% of the EPA limit 30 µg/L Highest in the city: HANCOCK VILLAGE MHP · 73 people · 2019	1/2	SYR4
Dichloroacetic Acid	1.7 µg/L No EPA limit set Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Antimony, Total	1.175 µg/L 20% of the EPA limit 6 µg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Dibromoacetic Acid	1.1 µg/L No EPA limit set Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2019	1/2	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CASTINE WATER DEPARTMENT · 983 people · 2023	2/2	LCR

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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Castine

Supplier	Population served
CASTINE WATER DEPARTMENT	983
HANCOCK VILLAGE MHP	73

Frequently asked questions about Castine tap water

Is Castine tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Castine. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Castine?

2 public water suppliers report drinking-water monitoring for Castine, Maine to the EPA. Each is listed above with its population served.

What contaminants are in Castine's water?

The contaminants EPA monitoring detected in Castine include Nitrate, Nitrate-Nitrite, Copper, Fluoride, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.

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.