COUNTY WATER-SYSTEM LEDGER
DuPage, Illinois
EPA’s September 2026 export lists 32 active community water systems serving DuPage, Illinois, with 7 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving DuPage, Illinois
EPA associates 32 covered systems with DuPage, Illinois; their reported population-served values total 834,595 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| NapervilleIL0434670 | 156,406 | Surface water purchased | No current violation flagged |
| WheatonIL0431050 | 53,970 | Surface water purchased | No current violation flagged |
| Downers GroveIL0430300 | 49,425 | Surface water purchased | No current violation flagged |
| ElmhurstIL0430350 | 45,000 | Surface water purchased | No current violation flagged |
| LombardIL0430600 | 44,476 | Surface water purchased | Current monitoring/reporting flag |
| Carol StreamIL0430200 | 39,854 | Surface water purchased | No current violation flagged |
| AddisonIL0430050 | 38,017 | Surface water purchased | No current violation flagged |
| WoodridgeIL0431250 | 33,566 | Surface water purchased | Other current violation flag |
| Glendale HeightsIL0430400 | 33,176 | Surface water purchased | No current violation flagged |
| Glen EllynIL0430450 | 28,850 | Surface water purchased | Other current violation flag |
| West ChicagoIL0430900 | 25,166 | Ground water | No current violation flagged |
| LisleIL0430551 | 24,223 | Surface water purchased | Other current violation flag |
| WestmontIL0430950 | 24,161 | Surface water purchased | No current violation flagged |
| RoselleIL0434820 | 22,897 | Surface water purchased | No current violation flagged |
| Villa ParkIL0430800 | 22,263 | Surface water purchased | No current violation flagged |
| BloomingdaleIL0430100 | 22,018 | Surface water purchased | Other current violation flag |
| DarienIL0430270 | 21,751 | Surface water purchased | No current violation flagged |
| BensenvilleIL0434140 | 18,537 | Surface water purchased | No current violation flagged |
| HinsdaleIL0434520 | 17,900 | Surface water purchased | No current violation flagged |
| Wood DaleIL0431200 | 14,012 | Surface water purchased | Other current violation flag |
| WarrenvilleIL0430833 | 12,350 | Ground water | No current violation flagged |
| Burr RidgeIL0434190 | 11,192 | Surface water purchased | No current violation flagged |
| WinfieldIL0431150 | 9,835 | Surface water purchased | No current violation flagged |
| ItascaIL0430500 | 9,506 | Surface water purchased | No current violation flagged |
| Oak BrookIL0430700 | 9,400 | Surface water purchased | No current violation flagged |
| WillowbrookIL0431100 | 9,000 | Surface water purchased | Current monitoring/reporting flag |
| Clarendon HillsIL0430250 | 8,702 | Surface water purchased | No current violation flagged |
| Southeast Regional Water FacilityIL0430060 | 6,940 | Surface water purchased | No current violation flagged |
| Il American-Valley ViewIL0437350 | 6,721 | Surface water purchased | No current violation flagged |
| Il American-Dupage UtilityIL0430552 | 6,613 | Surface water purchased | No current violation flagged |
| Aqua Illinois-Oak BrookIL0430055 | 5,361 | Surface water purchased | No current violation flagged |
| Il American-Liberty Ridge WestIL0435650 | 3,307 | Surface water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for DuPage, Illinois
EPA classifies 32 systems serving DuPage, Illinois across 2 primary-source categories; Surface water purchased is the largest category with 30 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.