Is OAK LAWN's water safe to drink?
OAK LAWN has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 58,362 people get their water from it, across 16,766 connections.
OAK LAWN's record against the rest of the country
11 total violations and 2 health-based ones put OAK LAWN at the 50th percentile nationally for violation burden, rank 6,468 of 12,903.
Against the IL average
OAK LAWN's 2 health-based violations sit within 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
OAK LAWN's most recent violation on record is dated 2025-01-07, with the most recent health-based one dated 1993-01-01. Last reported to EPA: 05/27/2026.
The concern categories on record
OAK LAWN'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:
- Lead & copper - flagged from: Lead and Copper Rule
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What OAK LAWN's record does not cover
Everything on this page is OAK LAWN's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 11 logged violations can see. The guide to what this data misses covers that gap.