Is Hopkinton, NH 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	4700 µg/L 47% of the EPA limit 10000 µg/L Highest in the city: ELM BROOK VILLAGE · 90 people · 2019	4/5	SYR4
Copper	87.88 µg/L 6.8% of the EPA limit 1300 µg/L Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019 Highest in the city: 1027 µg/L — ELM BROOK VILLAGE · 90 people · 2018	5/5	SYR4
Fluoride	466 µg/L 12% of the EPA limit 4000 µg/L Highest in the city: DEER MEADOWS · 150 people · 2017	2/5	SYR4
Nitrate-Nitrite	170 µg/L 1.7% of the EPA limit 10000 µg/L Highest in the city: THE MEADOWS · 200 people · 2019	2/5	SYR4
TTHM	88.28 µg/L 110% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019	1/5	SYR4
Chloroform	82.6 µg/L No EPA limit set Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019	1/5	SYR4
Total Haloacetic Acids (HAA5)	71 µg/L 118% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019	1/5	SYR4
Combined Uranium	50.7 µg/L 169% of the EPA limit, at the 95th percentile of samples — 30 µg/L Highest in the city: ELM BROOK VILLAGE · 90 people · 2019	2/5	SYR4
Trichloroacetic Acid	47.5 µg/L No EPA limit set Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019	1/5	SYR4
Dichloroacetic Acid	27.6 µg/L No EPA limit set Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019	1/5	SYR4
Barium	2.49 µg/L 0.1% of the EPA limit 2000 µg/L Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019 Highest in the city: 17.935 µg/L — THE MEADOWS · 200 people · 2017	4/5	SYR4
Lead	5.8 µg/L 39% of the EPA limit 15 µg/L Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019 Highest in the city: 16.9 µg/L — THE MEADOWS · 200 people · 2018	5/5	SYR4
Arsenic	4.78 µg/L 48% of the EPA limit 10 µg/L Highest in the city: DEER MEADOWS · 150 people · 2019	2/5	SYR4
Bromodichloromethane	4.22 µg/L No EPA limit set Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019	1/5	SYR4
Monochloroacetic Acid	3.82 µg/L No EPA limit set Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 2019	1/5	SYR4
Gross Alpha, Excl. Radon And U	3 pCi/L 20% of the EPA limit 15 pCi/L Highest in the city: DEER MEADOWS · 150 people · 2017	3/5	SYR4
Mercury	0.6800 µg/L 34% of the EPA limit 2 µg/L Highest in the city: THE MEADOWS · 200 people · 2017	1/5	SYR4
Combined Radium (-226 And -228)	0.5750 pCi/L 12% of the EPA limit 5 pCi/L Highest in the city: HOPKINTON VILLAGE PCT · 215 people · 2018	2/5	SYR4
Lead	0.0370 mg/L 247% above the EPA limit of 0.0150 mg/L Main supplier: CONTOOCOOK VILLAGE PCT · 1,600 people · 1993 Highest in the city: 0.2800 mg/L — HOPKINTON VILLAGE PCT · 215 people · 2009	3/5	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
CONTOOCOOK VILLAGE PCT	1,600
HOPKINTON VILLAGE PCT	215
THE MEADOWS	200
DEER MEADOWS	150
ELM BROOK VILLAGE	90

Frequently asked questions about Hopkinton tap water

Is Hopkinton tap water safe to drink?

EPA testing detected 19 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, New Hampshire 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, Copper, Fluoride, Nitrate-Nitrite, 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.