Tap Water Results

Is Merrimack, NH tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Summary

No federal limits exceeded in EPA data for Merrimack Village District.

Merrimack Village District supplies Merrimack (25,500 people).

Water system

Merrimack Village District

25,500 people · Groundwater · EPA ID NH1531010

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

Lead: 0 ppb at the 90th percentile (Jun 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Across New Hampshire, 9 of 49 water systems EPA tested had PFAS above a 2024 federal limit, and 25 systems were above the lead action level in results from the last five years. New Hampshire results.

Merrimack homes and lead pipes

33%
of homes built before 1980 (New Hampshire 52%, US 50%)
6%
built before 1950 (New Hampshire 22%)
11%
of households rent (New Hampshire 27%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Merrimack town (tables B25034, B25003). Estimates for small places have a margin of error.

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Londonderry 7 mi
Derry Water Dept
Derry Water DeptNone above limits0 ppb
Nashua 7 mi
Pennichuck Water Works
Pennichuck Water WorksNone above limits0 ppb
Hudson 8 mi
Hudson Water Dept
Hudson Water DeptAbove limit0 ppb
Manchester 10 mi
Manchester Water Works
Manchester Water WorksAbove limit0 ppb
Derry 12 mi
Derry Water Dept
Derry Water DeptNone above limits0 ppb
Salem 16 mi
Salem Water Dept
Salem Water DeptAbove limit2 ppb
Merrimack ZIP codes (1)
  • 03054

Questions

Is Merrimack tap water safe to drink?

Merrimack Village District has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Merrimack, NH?

Merrimack Village District, which serves 25,500 people.

Does Merrimack tap water have PFAS?

None detected above EPA's reporting limits. Merrimack Village District had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Merrimack homes have lead pipes?

Census estimates put 33% of Merrimack homes as built before 1980 (New Hampshire: 52%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Merrimack Village District's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.