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Tap water quality report

Madison, NH

EPA monitoring detected 12 contaminants across the 3 water suppliers serving Madison. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

3
water suppliers
1,275
people served
12
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Madison'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.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
1059 µg/L 26%
of the EPA limit 4000 µg/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2018
Highest in the city: 2861 µg/L — BROOKWOOD PARK · 50 people · 2018
2/3 SYR4
Nitrate
870 µg/L 8.7%
of the EPA limit 10000 µg/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2019
Highest in the city: 1840 µg/L — SILVER LAKE LANDING SR HOUSING · 25 people · 2019
3/3 SYR4
Copper
538.373 µg/L 41%
of the EPA limit 1300 µg/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2018
Highest in the city: 839.68 µg/L — SILVER LAKE LANDING SR HOUSING · 25 people · 2019
3/3 SYR4
Nitrate-Nitrite
750 µg/L 7.5%
of the EPA limit 10000 µg/L
Highest in the city: SILVER LAKE LANDING SR HOUSING · 25 people · 2014
1/3 SYR4
Barium
7.185 µg/L 0.4%
of the EPA limit 2000 µg/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2018
Highest in the city: 66.2491 µg/L — SILVER LAKE LANDING SR HOUSING · 25 people · 2019
3/3 SYR4
Combined Uranium
22.0686 µg/L 74%
of the EPA limit 30 µg/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2017
2/3 SYR4
Lead
18.749 µg/L 125%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2017
3/3 SYR4
Lithium
13.9 µg/L
No EPA limit set
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2023
1/3 UCMR-5
Gross Alpha, Excl. Radon And U
5.9 pCi/L 39%
of the EPA limit 15 pCi/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2014
2/3 SYR4
Chromium
4.06 µg/L 4.1%
of the EPA limit 100 µg/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2018
3/3 SYR4
Combined Radium (-226 And -228)
0.2000 pCi/L 4%
of the EPA limit 5 pCi/L
Main supplier: VILLAGE DISTRICT OF EIDELWEISS · 1,200 people · 2014
Highest in the city: 2 pCi/L — SILVER LAKE LANDING SR HOUSING · 25 people · 2019
3/3 SYR4
Lead
0.0250 mg/L 167%
above the EPA limit of 0.0150 mg/L
Highest in the city: BROOKWOOD PARK · 50 people · 2022
1/3 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 Madison

SupplierPopulation served
VILLAGE DISTRICT OF EIDELWEISS 1,200
BROOKWOOD PARK 50
SILVER LAKE LANDING SR HOUSING 25

Frequently asked questions about Madison tap water

Is Madison tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Madison. 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 Madison?

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

What contaminants are in Madison's water?

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