Is HILLSBORO's water safe to drink?
HILLSBORO has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 4,402 people through 2,082 service connections.
How this compares nationally
Out of 12,903 systems in this dataset, HILLSBORO ranks 1,616th by violation burden (87th percentile) - 25 violations total, 12 health-baseds.
Against the IL average
IL's 560 covered systems average 5.0 health-based violations each; HILLSBORO carries 12, more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
HILLSBORO's most recent violation on record is dated 2026-01-01, with the most recent health-based one dated 2020-01-01. Last reported to EPA: 05/27/2026.
The concern categories on record
HILLSBORO'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: Interim Enhanced Surface Water Treatment Rule
- Synthetic organic chemicals / pesticides / VOCs - flagged from: Atrazine
- Disinfection byproducts - flagged from: Total Haloacetic Acids (HAA5)
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's record does not cover
This is what HILLSBORO 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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 25 logged violations can see. The guide to what this data misses covers that gap.