County · Illinois
DuPage County, Illinois: drinking water records
This overview covers 37 ZIP codes and 48 community water systems in DuPage County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Prairie Path Water Company-Clarendon IL0435300 | 625 | 60 | 0 | 1 | 1.4 ppb |
| Naperville IL0434670 | 156,406 | 120 | 0 | 0 | 7.1 ppb |
| Wheaton IL0431050 | 53,970 | 120 | 0 | 0 | 1.5 ppb |
| Downers Grove IL0430300 | 49,425 | 120 | 0 | 0 | 4.2 ppb |
| Elmhurst IL0430350 | 45,000 | 120 | 1 | 0 | 7.2 ppb |
| Lombard IL0430600 | 44,476 | 120 | 0 | 0 | 11.2 ppb |
| Carol Stream IL0430200 | 39,854 | 240 | 1 | 0 | 0.8 ppb |
| Addison IL0430050 | 38,017 | 120 | 0 | 0 | 4.7 ppb |
| Woodridge IL0431250 | 33,566 | 120 | 0 | 0 | 1.8 ppb |
| Glendale Heights IL0430400 | 33,176 | 120 | 0 | 0 | 1.5 ppb |
| Glen Ellyn IL0430450 | 28,850 | 120 | 0 | 0 | 2.8 ppb |
| West Chicago IL0430900 | 25,166 | 60 | 0 | 0 | 0.9 ppb |
| Lisle IL0430551 | 24,223 | 120 | 0 | 0 | 0 ppb |
| Westmont IL0430950 | 24,161 | 120 | 0 | 0 | 8.3 ppb |
| Roselle IL0434820 | 22,897 | 120 | 0 | 0 | 3.8 ppb |
| Villa Park IL0430800 | 22,263 | 120 | 0 | 0 | 8.9 ppb |
| Bloomingdale IL0430100 | 22,018 | 120 | 0 | 0 | 1.3 ppb |
| Darien IL0430270 | 21,751 | 120 | 0 | 0 | 1.4 ppb |
| Bensenville IL0434140 | 18,537 | 120 | 0 | 0 | 6.3 ppb |
| Hinsdale IL0434520 | 17,900 | 120 | 0 | 0 | 5 ppb |
| Wood Dale IL0431200 | 14,012 | 120 | 0 | 0 | 0 ppb |
| Warrenville IL0430833 | 12,350 | 240 | 0 | 0 | 1.7 ppb |
| Burr Ridge IL0434190 | 11,192 | 120 | 0 | 0 | 0 ppb |
| Winfield IL0431150 | 9,835 | 120 | 0 | 0 | 0 ppb |
| Itasca IL0430500 | 9,506 | 240 | 1 | 0 | 0.9 ppb |
ZIP reports in DuPage County
No ZIP report in this county is published yet.
Sources and scope
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. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.