Is DERRY WATER DEPT's water safe to drink?
DERRY WATER DEPT has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 17,370, over 4,302 connections.
How this compares nationally
Out of 12,903 systems in this dataset, DERRY WATER DEPT ranks 5,612th by violation burden (57th percentile) - 3 violations total, 3 health-baseds.
How DERRY WATER DEPT compares within NH
NH's 62 covered systems average 8.6 health-based violations each; DERRY WATER DEPT carries 3, not more than typical for the state. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for DERRY WATER DEPT is from 2004-01-08 (health-based: 2004-01-08). Last reported to EPA: 06/23/2026.
What kind of problem, specifically
DERRY WATER DEPT's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
DERRY WATER DEPT's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 3 logged violations can see. The guide to what this data misses covers that gap.