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Safety Grade
We compute an overall water quality grade based on violations and health risks, not just legal compliance.
Health Context
Every contaminant comes with plain-English health effects, who's most at risk, and what to do.
Violation History
See every time your water exceeded legal limits or missed required testing, up to 10 years back.
Recommendations
Get specific, actionable suggestions: a filter type, a test kit, or nothing at all.
About this data: ClearWater uses the EPA's Safe Drinking Water Information System (SDWIS). Data is for public water systems only; private wells are not included. Legal limits (MCLs) are minimum standards; some contaminants may still pose health risks below legal thresholds.
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Water systems near
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DERRY WATER DEPT
DERRY, NH · 17,290 people served · Surface Water Purchased
Data last updated: 2026-07-13
0 total violations on record. No currently active health-based violations.
Lead & Copper
EPA has no lead or copper 90th-percentile results on record for this system.
Lithium
This system was monitored for lithium and none was detected at or above EPA's minimum reporting level of 9 µg/L.
Lithium has no federal drinking water limit. The Health Reference Level is a non-regulatory screening value from EPA's CCL 5 process, not an enforceable standard, and a result above it is not a violation. The figure shown is the highest single detection reported for this system; EPA compares averages, not maxima, when it reports national statistics. Source: EPA UCMR 5 occurrence data, reference values from EPA's UCMR 5 Data Summary (January 2026), Table 2.
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DERRY WATER DEPT: Frequently Asked Questions
Is DERRY WATER DEPT water safe to drink?
DERRY WATER DEPT has had 1 health-based violation in the last 5 years. The system generally meets EPA standards. Review the violation history below for details.
What violations has DERRY WATER DEPT had?
DERRY WATER DEPT has 0 total violations on record, but none are currently active health-based violations.
Does DERRY WATER DEPT water have lead?
Lead in drinking water typically comes from household plumbing, not from DERRY WATER DEPT's treatment plant. See the Lead & Copper section on this page for the most recent 90th-percentile lead test results. If your home was built before 1986, consider running cold water for 30 seconds before drinking and using an NSF/ANSI 53-certified filter.
Related water quality pages
PFAS / Forever Chemicals
EPA UCMR5 monitoring data (2023–2025). 1 PFAS compound detected.
| Compound | Detected | EPA MCL | Status |
|---|---|---|---|
| PFOA | 0.0046 µg/L | 0.004 µg/L | OVER LIMIT |
Source: EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5). MCLs finalized April 2024. Values shown are the maximum detected concentration across all sampling events, not running annual averages.
Lead & Copper
What To Do
Violations
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