Tap Water Lookup

State

Illinois: drinking water records

EPA lists 1,787 community water systems serving homes in Illinois. 479 took part in EPA's national PFAS survey (UCMR 5), and 127 found at least one PFAS above the level laboratories can measure.

In focus1,787community water systems
Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

0
ZIP reports published
1,787
community water systems
403
systems with a health-based violation since 2016
155
systems that reached the lead action level since 2016

PFAS in EPA’s final survey

127 of the 479 Illinois systems in EPA’s national PFAS survey found at least one PFAS, and 13 had a PFOA or PFOS yearly average at or above EPA’s limit. See Illinois’s PFAS results by system and compound.

Counties

ZIP reports

Beyond the Illinois overview

Pick a county. Then read the records.

PFASIllinois PFAS resultsWhich Illinois systems found PFAS in EPA’s final survey, and which compounds turned up most often.LeadLead in drinking waterHow EPA’s lead records work and what the action level means for your home’s pipes.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.
All states and territories

Sources

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Keep exploring

Every record tells
part of the story.

Find a place. Read the measurements.
Understand the context.

Explore water records