Is Northumberland, NH Tap Water Safe? Quality & Contaminants

What was found in Northumberland'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	1900 µg/L 19% of the EPA limit 10000 µg/L Main supplier: GROVETON WATER SYS · 2,650 people · 2019	1/2	SYR4
Copper	994 µg/L 76% of the EPA limit 1300 µg/L Main supplier: GROVETON WATER SYS · 2,650 people · 2019	2/2	SYR4
Fluoride	208.5 µg/L 5.2% of the EPA limit 4000 µg/L Highest in the city: LOST NATION WATER · 65 people · 2017	1/2	SYR4
Barium	21 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: GROVETON WATER SYS · 2,650 people · 2017	2/2	SYR4
Lead	7.75 µg/L 52% of the EPA limit 15 µg/L Main supplier: GROVETON WATER SYS · 2,650 people · 2019	2/2	SYR4
Gross Alpha, Excl. Radon And U	4.4 pCi/L 29% of the EPA limit 15 pCi/L Main supplier: GROVETON WATER SYS · 2,650 people · 2015	2/2	SYR4
Combined Uranium	2.085 µg/L 7% of the EPA limit 30 µg/L Main supplier: GROVETON WATER SYS · 2,650 people · 2018	2/2	SYR4
TTHM	1.2885 µg/L 1.6% of the EPA limit 80 µg/L Main supplier: GROVETON WATER SYS · 2,650 people · 2019	2/2	SYR4
Chloroform	1 µg/L No EPA limit set Highest in the city: LOST NATION WATER · 65 people · 2019	1/2	SYR4
Bromodichloromethane	0.6770 µg/L No EPA limit set Main supplier: GROVETON WATER SYS · 2,650 people · 2019	1/2	SYR4
Dibromochloromethane	0.6195 µg/L No EPA limit set Main supplier: GROVETON WATER SYS · 2,650 people · 2019	1/2	SYR4
Combined Radium (-226 And -228)	0.1000 pCi/L 2% of the EPA limit 5 pCi/L Main supplier: GROVETON WATER SYS · 2,650 people · 2015 Highest in the city: 0.2000 pCi/L — LOST NATION WATER · 65 people · 2014	2/2	SYR4
Lead	0.0300 mg/L 200% above the EPA limit of 0.0150 mg/L Main supplier: GROVETON WATER SYS · 2,650 people · 1993 Highest in the city: 0.1680 mg/L — LOST NATION WATER · 65 people · 2004	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 Northumberland

Supplier	Population served
GROVETON WATER SYS	2,650
LOST NATION WATER	65

Frequently asked questions about Northumberland tap water

Is Northumberland tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Northumberland. 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 Northumberland?

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

What contaminants are in Northumberland's water?

The contaminants EPA monitoring detected in Northumberland include Nitrate, Copper, Fluoride, Barium, Lead. 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.