EPA public water records · 17031
Cook County, Illinois
Find listed community water systems and their documented follow-up in federal fiscal 2026Q3.
- Systems with linked histories
- 122
- Systems with unresolved health-based records
- 5
- Of those, systems with a formally addressed health-based record
- 0
These counts cover the linked records shown here. A county listing can cover only part of the county or reflect a mailing location.
Find your water system
- ALPINE VILLAGE MHPIL0315125 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- ALSIPIL0310030 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- AQUA ILLINOIS-NORTH MAINE UTILITIESIL0315350 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- AQUA ILLINOIS-SUMMERDALEIL0312050 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- ARLINGTON HEIGHTSIL0314030 · Illinois · 25 violation records · 0 unresolved health-based in this snapshot
- BARTLETTIL0314120 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- BELLWOODIL0310150 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- BERWYNIL0310210 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- BLACKHAWK ESTATES LLCIL0317765 · Illinois · 9 violation records · 0 unresolved health-based in this snapshot
- BLUE ISLANDIL0310240 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- BROADVIEWIL0310300 · Illinois · 8 violation records · 0 unresolved health-based in this snapshot
- BUFFALO GROVEIL0314180 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- BURNHAMIL0310360 · Illinois · 17 violation records · 1 unresolved health-based in this snapshot
- CALUMET CITYIL0310390 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- CALUMET PARKIL0310420 · Illinois · 8 violation records · 0 unresolved health-based in this snapshot
- CANDLELIGHT VILLAGE MHPIL0315175 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- CENTRAL STICKNEY SDIL0315570 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- CHICAGOIL0316000 · Illinois · 10 violation records · 0 unresolved health-based in this snapshot
- CHICAGO HEIGHTSIL0310450 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- CICEROIL0310510 · Illinois · 8 violation records · 0 unresolved health-based in this snapshot
- COUNTRY CLUB HILLSIL0310540 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- COUNTRYSIDEIL0310570 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- CRESTWOODIL0310600 · Illinois · 10 violation records · 0 unresolved health-based in this snapshot
- DES PLAINESIL0310630 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- DES PLAINES MHPIL0317775 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- DIXMOORIL0310660 · Illinois · 15 violation records · 0 unresolved health-based in this snapshot
- DOLTONIL0310690 · Illinois · 20 violation records · 0 unresolved health-based in this snapshot
- EAST HAZEL CRESTIL0310750 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- EDWARD HINES JR V A HOSPITALIL0315617 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- ELK GROVE VILLAGEIL0314400 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- ELMWOOD PARKIL0310780 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- FLOSSMOORIL0310870 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- FORD HEIGHTSIL0310720 · Illinois · 8 violation records · 0 unresolved health-based in this snapshot
- FOREST PARKIL0310900 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- FOREST VIEWIL0310930 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- FRANCISCAN SISTERS OF CHICAGOIL0310110 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- FRANKLIN PARKIL0310960 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- GARDEN HOME SDIL0315620 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- GLEN EDEN ESTATES HOMEOWNERS ASSOCIATIONIL0315650 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- GLENVIEWIL0311020 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- GLENWOODIL0311050 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- HANOVER PARKIL0314480 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- HARBOR POINT ESTATES MHPIL0317010 · Illinois · 8 violation records · 0 unresolved health-based in this snapshot
- HARVEYIL0311110 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- HARWOOD HEIGHTSIL0311140 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- HAZEL CRESTIL0311170 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- HODGKINSIL0311260 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- HOMETOWNIL0311320 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- HOMEWOODIL0311350 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- INDIAN HEAD PARKIL0311410 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- KENILWORTHIL0311500 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- LA GRANGEIL0311530 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- LA GRANGE ESTATES MHPIL0311540 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- LA GRANGE HIGHLANDS SANITARY DISTRICTIL0315860 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- LA GRANGE PARKIL0311560 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- LANSINGIL0311590 · Illinois · 8 violation records · 0 unresolved health-based in this snapshot
- LEMONTIL0311620 · Illinois · 4 violation records · 1 unresolved health-based in this snapshot
- LEYDEN TWSP WATER DISTRICTIL0315880 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- LINCOLNWOODIL0311650 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- LINDENTREE TOWNHOMESIL0310370 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- LINWAY ESTATES MHPIL0315935 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- LYNWOODIL0311680 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- LYONSIL0311710 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- MARKHAMIL0311770 · Illinois · 9 violation records · 0 unresolved health-based in this snapshot
- MATTESONIL0311800 · Illinois · 11 violation records · 0 unresolved health-based in this snapshot
- MAYWOODIL0311830 · Illinois · 9 violation records · 1 unresolved health-based in this snapshot
- MELROSE PARKIL0311860 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- MERRIONETTE PARKIL0311890 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- MIDLOTHIANIL0311920 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- MISSION BROOK SDIL0315920 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- MORTON GROVEIL0311950 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- MOUNT PROSPECTIL0311980 · Illinois · 12 violation records · 0 unresolved health-based in this snapshot
- NILESIL0312010 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- NORTHBROOKIL0312070 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- NORTHFIELDIL0312100 · Illinois · 2 violation records · 1 unresolved health-based in this snapshot
- NORTHLAKEIL0314710 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- OAK FORESTIL0312190 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- OAK LAWNIL0312220 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- OASIS MHPIL0315185 · Illinois · 12 violation records · 0 unresolved health-based in this snapshot
- OLYMPIA FIELDSIL0312280 · Illinois · 11 violation records · 0 unresolved health-based in this snapshot
- ORLAND PARKIL0312310 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- PALOS HEIGHTSIL0312370 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- PALOS HILLSIL0312400 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- PARK FORESTIL0314740 · Illinois · 32 violation records · 0 unresolved health-based in this snapshot
- PARK RIDGEIL0312460 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- PHOENIXIL0312490 · Illinois · 22 violation records · 0 unresolved health-based in this snapshot
- POSENIL0312520 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- PROSPECT HEIGHTSIL0312530 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- RICHTON PARKIL0312550 · Illinois · 55 violation records · 1 unresolved health-based in this snapshot
- RIVER FORESTIL0312610 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- RIVER GROVEIL0312640 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- RIVER OAKS ESTATES MHPIL0310395 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- RIVERDALEIL0312580 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- RIVERSIDEIL0312670 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- ROBBINSIL0312700 · Illinois · 29 violation records · 0 unresolved health-based in this snapshot
- ROLLING MEADOWSIL0312730 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- ROSEMONTIL0312760 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- SAUK VILLAGEIL0312790 · Illinois · 164 violation records · 0 unresolved health-based in this snapshot
- SCHAUMBURGIL0314890 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- SCHILLER PARKIL0312850 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- SKOKIEIL0312880 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- SOUTH BARRINGTONIL0310200 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- SOUTH CHICAGO HEIGHTSIL0312940 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- SOUTH HOLLANDIL0312970 · Illinois · 7 violation records · 0 unresolved health-based in this snapshot
- SOUTH PALOS TWSP SANITARY DISTIL0310140 · Illinois · 8 violation records · 0 unresolved health-based in this snapshot
- SOUTH STICKNY SDIL0317370 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- SPRING LAKES MHPIL0315145 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- STEGERIL0314860 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- STERLING ESTATES MHPIL0315850 · Illinois · 5 violation records · 0 unresolved health-based in this snapshot
- STICKNEYIL0313000 · Illinois · 10 violation records · 0 unresolved health-based in this snapshot
- STONE PARKIL0313030 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- STREAMWOODIL0313060 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- SUMMITIL0310060 · Illinois · 6 violation records · 0 unresolved health-based in this snapshot
- SUNRISE SENIOR LIVINGIL0312540 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
- SUNSET MHPIL0310080 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- THORNTONIL0313090 · Illinois · 4 violation records · 0 unresolved health-based in this snapshot
- TINLEY PARKIL0314910 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- WESTCHESTERIL0313150 · Illinois · 7 violation records · 0 unresolved health-based in this snapshot
- WESTERN SPRINGSIL0313180 · Illinois · 10 violation records · 0 unresolved health-based in this snapshot
- WILLOWAY TERRACE MHPIL0317595 · Illinois · 2 violation records · 0 unresolved health-based in this snapshot
- WILMETTEIL0313300 · Illinois · 3 violation records · 0 unresolved health-based in this snapshot
- WORTHIL0313360 · Illinois · 1 violation records · 0 unresolved health-based in this snapshot
EPA data and scope
How to read the records
The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.
- We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
- EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
- Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
- We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.
EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility