What's in HILLSDALE's water?
HILLSDALE had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 8,163 people get their water from it, across 4,016 connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, HILLSDALE ranks 6,712th by violation burden (48th percentile) - 7 violations total, 2 health-baseds.
How HILLSDALE compares within MI
Among the 390 MI systems in this dataset, the average is 1.3 health-based violations - HILLSDALE's 2 is above that. 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 HILLSDALE is from 2022-01-04 (health-based: 2022-01-04). Last reported to EPA: 06/23/2026.
What kind of problem, specifically
HILLSDALE'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:
- Disinfection byproducts - flagged from: TTHM; Total Haloacetic Acids (HAA5)
The most severe category on record is disinfection byproducts, which points toward a carbon-class filter if you want to address it directly.
What this data is and is not
This is what HILLSDALE 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. Between the utility's meter and HILLSDALE's customers' taps is household plumbing, invisible to a system-level record ranked 6,712th of 12,903 by violation count. The guide to what this data misses covers that gap.