Is DIAMOND's water safe to drink?
DIAMOND has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 2,508 people through 920 service connections.
DIAMOND's record against the rest of the country
Out of 12,903 systems in this dataset, DIAMOND ranks 879th by violation burden (93th percentile) - 84 violations total, 20 health-baseds.
Against the IL average
DIAMOND's 20 health-based violations sit above the IL average of 5.0, across 560 systems statewide. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
DIAMOND's most recent violation on record is dated 2015-01-09, with the most recent health-based one dated 2004-01-07. Last reported to EPA: 05/27/2026.
The concern categories on record
DIAMOND'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 DIAMOND's record does not cover
DIAMOND'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. Between the utility's meter and DIAMOND's customers' taps is household plumbing, invisible to a system-level record ranked 879th of 12,903 by violation count. The guide to what this data misses covers that gap.