Is Hopkinton, RI Tap Water Safe? Quality & Contaminants

What was found in Hopkinton'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-Nitrite	866.5 µg/L 8.7% of the EPA limit 10000 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018 Highest in the city: 3630 µg/L — BETHEL VILLAGE WATER ASSN · 180 people · 2019	4/5	SYR4
Nitrate	1401.5 µg/L 14% of the EPA limit 10000 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2019 Highest in the city: 3170 µg/L — BETHEL VILLAGE WATER ASSN · 180 people · 2018	4/5	SYR4
Copper	519.7 µg/L 40% of the EPA limit 1300 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2017 Highest in the city: 1020 µg/L — HOPKINTON, TOWN OF · 125 people · 2019	5/5	SYR4
Fluoride	107.8 µg/L 2.7% of the EPA limit 4000 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018 Highest in the city: 708 µg/L — BETHEL VILLAGE WATER ASSN · 180 people · 2018	4/5	SYR4
Barium	62.8 µg/L 3.1% of the EPA limit 2000 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018	4/5	SYR4
Cyanide	22.2 µg/L 11% of the EPA limit 200 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018	1/5	SYR4
Gross Alpha, Excl. Radon And U	20.135 pCi/L 134% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Highest in the city: CANONCHET CLIFFS WATER ASSOCIATION INC. · 154 people · 2018	2/5	SYR4
Combined Radium (-226 And -228)	2.8055 pCi/L 56% of the EPA limit 5 pCi/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018 Highest in the city: 18.144 pCi/L — CANONCHET CLIFFS WATER ASSOCIATION INC. · 154 people · 2019	2/5	SYR4
Lead	13.455 µg/L 90% of the EPA limit 15 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2017 Highest in the city: 14.5 µg/L — SAUGATUCKET SPRINGS · 110 people · 2019	5/5	SYR4
Combined Uranium	10.52 µg/L 35% of the EPA limit 30 µg/L Highest in the city: CANONCHET CLIFFS WATER ASSOCIATION INC. · 154 people · 2018	1/5	SYR4
Chromium	4.7 µg/L 4.7% of the EPA limit 100 µg/L Highest in the city: CANONCHET CLIFFS WATER ASSOCIATION INC. · 154 people · 2018	3/5	SYR4
Di(2-ethylhexyl) Phthalate	3.6 µg/L 60% of the EPA limit 6 µg/L Highest in the city: SAUGATUCKET SPRINGS · 110 people · 2019	2/5	SYR4
Arsenic	0.6950 µg/L 7% of the EPA limit 10 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018	1/5	SYR4
Beryllium, Total	0.3000 µg/L 7.5% of the EPA limit 4 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018	1/5	SYR4
Thallium, Total	0.1000 µg/L 5% of the EPA limit 2 µg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2018	1/5	SYR4
Lead	0.0028 mg/L 19% of the EPA limit 0.0150 mg/L Main supplier: LINDHBROOK WATER COMPANY · 200 people · 2023 Highest in the city: 0.0050 mg/L — BETHEL VILLAGE WATER ASSN · 180 people · 2023	5/5	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 Hopkinton

Supplier	Population served
LINDHBROOK WATER COMPANY	200
BETHEL VILLAGE WATER ASSN	180
CANONCHET CLIFFS WATER ASSOCIATION INC.	154
HOPKINTON, TOWN OF	125
SAUGATUCKET SPRINGS	110

Frequently asked questions about Hopkinton tap water

Is Hopkinton tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Hopkinton. 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 Hopkinton?

5 public water suppliers report drinking-water monitoring for Hopkinton, Rhode Island to the EPA. Each is listed above with its population served.

What contaminants are in Hopkinton's water?

The contaminants EPA monitoring detected in Hopkinton include Nitrate-Nitrite, Nitrate, Copper, Fluoride, Barium. 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.