New Hampshire
Merrimack
Good news: No PFAS detected above reporting limits in your water system.
- Population served
- 26K
- Systems tested
- 1
- Compounds detected
- 29
- Above federal limits
- 0
Source: EPA UCMR 5 · Samples collected 2023–2026
What was found in Merrimack’s water
MERRIMACK VILLAGE DIST
Serves 26K people · GW
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
This compound is monitored under UCMR 5 but has no enforceable EPA drinking water limit yet.
About PFAS contamination in Merrimack
## Summary
Merrimack's municipal water system, served by Merrimack Village District, earned an A grade — the highest possible rating — meaning the system is currently meeting federal drinking water standards for PFAS compounds. No detected concentrations were reported as exceeding any federal limits. While 15 PFAS compounds were screened, none triggered violations under existing federal thresholds. The contamination source tied to Merrimack's long history with PFAS is Saint-Gobain Performance Plastics, a local manufacturer.
## What the data shows
Fifteen PFAS compounds were included in the screening for Merrimack Village District, including HFPO-DA, which carries an EPA limit of 10 parts per trillion. No concentration was reported for HFPO-DA or any other compound on the list, indicating levels were either undetected or below reporting thresholds. The remaining 14 compounds — including PFBS, PFPeA, PFBA, and several others — currently have no established federal limits, meaning they are not subject to enforceable standards regardless of concentration. There is only one water system serving Merrimack, and it received the top grade.
## What residents should know
Merrimack has a well-documented history with PFAS contamination linked to Saint-Gobain Performance Plastics, and a remediation agreement was signed in March 2026 — a development residents should monitor for updates on cleanup timelines and any compensation. The current A grade reflects compliance with today's federal standards, though residents with specific concerns about unregulated compounds should contact Merrimack Village District directly for the most current testing data. Your water utility remains the best source for up-to-date information on what is and isn't being measured.
About this summary: Narrative text on this page was drafted by an AI model (claude-sonnet-4-6) from EPA UCMR 5 data and reviewed before publication. The numeric data above is reported by water utilities directly to the EPA. If you spot an error, email data@checkyourwater.org.
What Merrimack residents can do
Merrimack's water meets federal PFAS standards based on EPA UCMR 5 testing. To stay informed:
- Read your utility's annual Consumer Confidence Report (CCR) — request a copy if you don't receive one.
- Sign up for water quality alerts from your utility.
- If you're on a private well, get it independently tested for PFAS.
- Reduce PFAS exposure from non-water sources: avoid non-stick cookware, stain-resistant fabrics, and grease-resistant food packaging.
Primary contamination source: Saint-Gobain Performance Plastics
Settlement information: Saint-Gobain remediation deal signed March 2026
How Merrimack compares
Merrimack is part of our launch coverage of communities where EPA UCMR 5 testing has detected PFAS in drinking water.
Where this data comes from
- Testing program: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5)
- Testing period: 2023–2026
- Federal limits: EPA Maximum Contaminant Levels (MCLs) finalized April 2024
- Methodology: Read how we calculate grades
- Raw EPA data: EPA UCMR Occurrence Data
This data reflects EPA testing. Your water utility may have more recent results — contact them directly for the most current information.