HILLSBORO CITY: EPA violation history, explained

HILLSBORO CITY has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 6,650 people get their water from it, across 3,359 connections.

Ranked against every other system in this dataset

HILLSBORO CITY has 19 violations on record in total, 6 of thems health-based - ranking it 3,116th of 12,903 systems by violation count, the 76th percentile nationally.

Against the OH average

HILLSBORO CITY's 6 health-based violations sit above the OH average of 5.5, across 394 systems statewide. See the lead and copper guide for why lead counts differently.

Most recent violation on record

HILLSBORO CITY's most recent violation on record is dated 2025-02-07, with the most recent health-based one dated 2007-01-10. Last reported to EPA: 05/15/2026.

The concern categories on record

HILLSBORO CITY'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: Surface Water Treatment Rule

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 HILLSBORO CITY's record does not cover

This is what HILLSBORO CITY reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. This record - 6 health-based violations on file for HILLSBORO CITY - 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.