What's in CRYSTAL LAKE's water?
CRYSTAL LAKE has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 40,661 people get their water from it, across 14,101 connections.
CRYSTAL LAKE's record against the rest of the country
27 total violations and 4 health-based ones put CRYSTAL LAKE at the 68th percentile nationally for violation burden, rank 4,131 of 12,903.
Against the IL average
IL's 560 covered systems average 5.0 health-based violations each; CRYSTAL LAKE carries 4, not more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
CRYSTAL LAKE's most recent violation on record is dated 2026-01-01, with the most recent health-based one dated 1996-01-07. Last reported to EPA: 05/27/2026.
The concern categories on record
CRYSTAL LAKE'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)
- Other regulated metals - flagged from: Barium
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 CRYSTAL LAKE's record does not cover
CRYSTAL LAKE'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. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 27 logged violations can see. The guide to what this data misses covers that gap.