AMBOY: EPA violation history, explained

AMBOY's only violations on record are reporting or monitoring lapses, not a contaminant or treatment-technique failure EPA classifies as health-based. 2,500 people get their water from it, across 945 connections.

Ranked against every other system in this dataset

Out of 12,903 systems in this dataset, AMBOY ranks 11,505th by violation burden (11th percentile) - 4 violations total, 0 health-baseds.

Against the IL average

Among the 560 IL systems in this dataset, the average is 5.0 health-based violations - AMBOY's 0 is at or below that. See the lead and copper guide for why lead counts differently.

Most recent violation on record

AMBOY's most recent violation on record is dated 2017-01-07. Last reported to EPA: 05/27/2026.

What AMBOY's record does not cover

AMBOY'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 AMBOY's customers' taps is household plumbing, invisible to a system-level record ranked 11,505th of 12,903 by violation count. The guide to what this data misses covers that gap.