PORTSMOUTH WATER WORKS: EPA violation history, explained
PORTSMOUTH WATER WORKS has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 33,000 people through 7,200 service connections.
How this compares nationally
12 total violations and 12 health-based ones put PORTSMOUTH WATER WORKS at the 87th percentile nationally for violation burden, rank 1,666 of 12,903.
How PORTSMOUTH WATER WORKS compares within NH
PORTSMOUTH WATER WORKS's 12 health-based violations sit above the NH average of 8.6, across 62 systems statewide. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
The last violation EPA has on record for PORTSMOUTH WATER WORKS is from 2014-01-07 (health-based: 2014-01-07). Last reported to EPA: 06/23/2026.
What kind of problem, specifically
PORTSMOUTH WATER WORKS'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); Interim Enhanced Surface Water Treatment Rule; Surface Water Treatment Rule
- Disinfection byproducts - flagged from: TTHM; Total Haloacetic Acids (HAA5)
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
PORTSMOUTH WATER WORKS'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. This record - 12 health-based violations on file for PORTSMOUTH WATER WORKS - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.