Plainfield, IL Water Quality
Is Plainfield's water safe to drink?
Plainfield has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. Population served: 50,000, over 15,894 connections.
Ranked against every other system in this dataset
Plainfield has 34 violations on record in total, 19 of them health-based - ranking it 952th of 12,903 systems by violation count, the 93th percentile nationally.
Against the IL average
Among the 572 IL systems in this dataset, the average is 5.1 health-based violations - Plainfield's 19 is above that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
Plainfield's most recent violation on record is dated 2025-01-07, with the most recent health-based one dated 2004-01-01. Last reported to EPA: 05/27/2026.
The concern categories on record
Plainfield'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 Plainfield's record does not cover
Everything on this page is Plainfield's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 19 health-based violations on file for Plainfield - 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.