F0/100
Somersworth Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 12,000 residents · New Hampshire
What's In Somersworth's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 380.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2007.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
SOMERSWORTH WATER WORKS
Population Served
12,000
Water Source
Surface Water
System ID
NH2151010
Frequently Asked Questions About Somersworth Water
Is Somersworth tap water safe to drink?
Somersworth, New Hampshire tap water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA maximum contaminant levels and 37 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Somersworth's water?
Of the 69 contaminants tested in Somersworth's water supply, the most notable include chlorate. No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Somersworth have any water quality violations?
Yes, Somersworth has 37 EPA violation(s) on record, with the most recent in 2007. Violation types include Other, MCL, TT. 35 of these are health-based violations, which are the most serious category.
Do I need a water filter in Somersworth?
Somersworth water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Somersworth's tap water come from?
Somersworth's drinking water is sourced from surface water and supplied by SOMERSWORTH WATER WORKS. The system serves approximately 12,000 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Somersworth's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Somersworth's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Somersworth's water compare to other cities in New Hampshire?
Somersworth's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our New Hampshire state page to see how all cities in the state compare.
What should I do if I'm concerned about Somersworth's water quality?
If you have concerns about Somersworth's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (SOMERSWORTH WATER WORKS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.