Merrimack, NH Water Quality Report

Is Merrimack tap water safe? See PFAS and lead contamination levels for Merrimack, New Hampshire. Compare to EPA limits and get filter recommendations.

Quick Answers

Is Merrimack, NH tap water safe to drink? Merrimack, NH tap water meets most federal EPA limits, but PFAS compounds have been detected at an average of 42 ppt across 1 compound. A certified pitcher filter or reverse osmosis system is recommended for sensitive populations.

What contaminants are in Merrimack, NH water? Top PFAS compounds detected in Merrimack water: PFOA (42 ppt). See the full table for all monitored contaminants and comparison to EPA limits.

What filter should I use in Merrimack, NH? Match the filter to what's in New Hampshire water: reverse osmosis handles PFAS, lead, and arsenic together (90%+ removal); NSF-53 certified pitchers like Clearly Filtered or ZeroWater cover taps you drink from. A standard Brita pitcher will not remove PFAS.

Merrimack, NH Water Quality Summary

EPA testing has detected PFAS "forever chemicals" in Merrimack, NH drinking water. Recent monitoring found a peak level of 42 ppt across 1 water system, representing an average of 42 ppt across 1 detected compound.

Contamination Level: MODERATE – Moderate contamination – PFAS detected at meaningful levels; filtration recommended.

Top Detected Compounds

  • PFOA: 42 ppt (exceeds EPA 4 ppt limit for PFOA/PFOS)

Lead in Merrimack, NH Water

EPA Lead and Copper Rule testing has recorded 6 lead samples for Merrimack water systems, with a 90th-percentile high of 0.002 mg/L (within the EPA 0.015 mg/L action level). There is no safe level of lead for children; if your home was built before 1986, a certified NSF/ANSI 53 lead-removal filter is recommended.

EPA Violations in Merrimack, NH

Merrimack public water systems have 3 health-based EPA Safe Drinking Water Act violations on record, including Nitrite, Chromium. Health-based violations mean a contaminant exceeded its federal limit or required treatment was not applied.

About the Data

These figures come from the EPA's Unregulated Contaminant Monitoring Rule 5 (UCMR5) testing program, 2023-2025. UCMR5 is the most comprehensive national drinking water survey in US history, covering 66,000+ public water systems. Population of Merrimack, NH: approximately 26,965.

ZIP Codes Served

03054

What Merrimack, New Hampshire Residents Should Do

  1. Enter your exact ZIP code at knowyourexposure.com for address-level data
  2. If anyone in your household is pregnant or under 5, prioritize a certified PFAS filter now and consider a home test kit
  3. For long-term protection, an NSF/ANSI 58 reverse osmosis system removes 94-99% of PFAS
  4. Read the Consumer Confidence Report (CCR) your New Hampshire utility publishes each year