GRINNELL WATER DEPARTMENT: EPA violation history, explained
GRINNELL WATER DEPARTMENT had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. It serves 9,564 people through 3,600 service connections.
How this compares nationally
Out of 12,903 systems in this dataset, GRINNELL WATER DEPARTMENT ranks 1,376th by violation burden (89th percentile) - 23 violations total, 14 health-baseds.
How GRINNELL WATER DEPARTMENT compares within IA
GRINNELL WATER DEPARTMENT's 14 health-based violations sit above the IA average of 3.5, across 203 systems statewide. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for GRINNELL WATER DEPARTMENT is from 2026-01-01 (health-based: 2026-01-01). Last reported to EPA: 06/17/2026.
What kind of problem, specifically
GRINNELL WATER DEPARTMENT'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)
- Radionuclides - flagged from: Combined Radium (-226 and -228); Gross Alpha, Excl. Radon and U
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
Everything on this page is GRINNELL WATER DEPARTMENT's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 23 logged violations can see. The guide to what this data misses covers that gap.