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Tap water quality report

Merrimack, NH

EPA monitoring detected 11 contaminants across the 1 water supplier serving Merrimack. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
25,500
people served
11
contaminants found
New Hampshire rankings Lead in New Hampshire PFAS in New Hampshire

What was found in Merrimack's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
2300 µg/L 23%
of the EPA limit 10000 µg/L
 1/1 SYR4
Copper
446 µg/L 34%
of the EPA limit 1300 µg/L
 1/1 SYR4
Barium
118 µg/L 5.9%
of the EPA limit 2000 µg/L
 1/1 SYR4
TTHM
25.1 µg/L 31%
of the EPA limit 80 µg/L
 1/1 SYR4
Total Haloacetic Acids (HAA5)
20 µg/L 33%
of the EPA limit 60 µg/L
 1/1 SYR4
Chloroform
15 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
8.1 µg/L
No EPA limit set
 1/1 SYR4
Lead
8 µg/L 53%
of the EPA limit 15 µg/L
 1/1 SYR4
Dibromochloromethane
6.6 µg/L
No EPA limit set
 1/1 SYR4
Bromoform
2.6 µg/L
No EPA limit set
 1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 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 single worst sample on record — 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 Merrimack

SupplierPopulation served
MERRIMACK VILLAGE DIST 25,500

Frequently asked questions about Merrimack tap water

Is Merrimack tap water safe to drink?

EPA testing detected 11 contaminants in the water serving Merrimack. 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 Merrimack?

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

What contaminants are in Merrimack's water?

The contaminants EPA monitoring detected in Merrimack include Nitrate, Copper, Barium, TTHM, Total Haloacetic Acids (HAA5). The full list, with the highest level found 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.