Is Grantham, NH Tap Water Safe? Quality & Contaminants

What was found in Grantham'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
Fluoride	590 µg/L 15% of the EPA limit 4000 µg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2018 Highest in the city: 620 µg/L — GRAY LEDGES · 50 people · 2018	2/2	SYR4
Copper	400 µg/L 31% of the EPA limit 1300 µg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2018	2/2	SYR4
TTHM	62.52 µg/L 78% of the EPA limit 80 µg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2019	1/2	SYR4
Total Haloacetic Acids (HAA5)	49.6 µg/L 83% of the EPA limit 60 µg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2019	1/2	SYR4
Chloroform	47.71 µg/L No EPA limit set Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2019	1/2	SYR4
Trichloroacetic Acid	28.3 µg/L No EPA limit set Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2019	1/2	SYR4
Barium	24 µg/L 1.2% of the EPA limit 2000 µg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2018	2/2	SYR4
Dichloroacetic Acid	21.3 µg/L No EPA limit set Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2019	1/2	SYR4
Bromodichloromethane	13.125 µg/L No EPA limit set Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2019	1/2	SYR4
Lead	4.5 µg/L 30% of the EPA limit 15 µg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2018 Highest in the city: 11 µg/L — GRAY LEDGES · 50 people · 2018	2/2	SYR4
Chromium	6.85 µg/L 6.8% of the EPA limit 100 µg/L Highest in the city: GRAY LEDGES · 50 people · 2018	1/2	SYR4
Dibromochloromethane	2.975 µg/L No EPA limit set Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2019	1/2	SYR4
Combined Uranium	1.6 µg/L 5.3% of the EPA limit 30 µg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2018	1/2	SYR4
Lead	0.0070 mg/L 47% of the EPA limit 0.0150 mg/L Main supplier: VILLAGE DIST OF EASTMAN · 3,400 people · 2024 Highest in the city: 0.1060 mg/L — GRAY LEDGES · 50 people · 1993	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 Grantham

Supplier	Population served
VILLAGE DIST OF EASTMAN	3,400
GRAY LEDGES	50

Frequently asked questions about Grantham tap water

Is Grantham tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Grantham. 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 Grantham?

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

What contaminants are in Grantham's water?

The contaminants EPA monitoring detected in Grantham include Fluoride, Copper, TTHM, Total Haloacetic Acids (HAA5), Chloroform. 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.