Is Littleton, NH Tap Water Safe? Quality & Contaminants

What was found in Littleton'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
Copper	541 µg/L 42% of the EPA limit 1300 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Nitrate	300 µg/L 3% of the EPA limit 10000 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Fluoride	188.5 µg/L 4.7% of the EPA limit 4000 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
TTHM	56.175 µg/L 70% of the EPA limit 80 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Chloroform	55.375 µg/L No EPA limit set Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	42.3 µg/L 71% of the EPA limit 60 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Lead	35.705 µg/L 238% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Trichloroacetic Acid	26.27 µg/L No EPA limit set Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Dichloroacetic Acid	23.46 µg/L No EPA limit set Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Barium	21.95 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Combined Uranium	1.88 µg/L 6.3% of the EPA limit 30 µg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2015	1/1	SYR4
Bromodichloromethane	1.01 µg/L No EPA limit set Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Dibromochloromethane	0.7900 µg/L No EPA limit set Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2019	1/1	SYR4
Gross Alpha, Excl. Radon And U	0.5670 pCi/L 3.8% of the EPA limit 15 pCi/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2015	1/1	SYR4
Lead	0.0080 mg/L 53% of the EPA limit 0.0150 mg/L Main supplier: LITTLETON WATER AND LIGHT · 6,500 people · 2022	1/1	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 Littleton

Supplier	Population served
LITTLETON WATER AND LIGHT	6,500

Frequently asked questions about Littleton tap water

Is Littleton tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Littleton. 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 Littleton?

1 public water supplier report drinking-water monitoring for Littleton, New Hampshire to the EPA. Each is listed above with its population served.

What contaminants are in Littleton's water?

The contaminants EPA monitoring detected in Littleton include Copper, Nitrate, Fluoride, TTHM, 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.