DuPage County tap water
0 of 32 water systems serving DuPage County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 48 community water systems list this county as served; 30 serve 3,300+ people with full PFAS testing.
- 2 had a health-based violation since 2021-10-26.
Largest systems serving this county
| System | Source | People served (whole system) | PFAS above a 2024 level? | Violations since 2021-10-26 |
|---|---|---|---|---|
| Naperville | Purchased surface water | 156,406 | No | 0 |
| Wheaton | Purchased surface water | 53,970 | No | 0 |
| Downers Grove | Purchased surface water | 49,425 | No | 0 |
| Elmhurst | Purchased surface water | 45,000 | No | 0 |
| Lombard | Purchased surface water | 44,476 | No | 0 |
| Carol Stream | Purchased surface water | 39,854 | No | 0 |
| Addison | Purchased surface water | 38,017 | No | 0 |
| Woodridge | Purchased surface water | 33,566 | No | 0 |
| Glendale Heights | Purchased surface water | 33,176 | No | 0 |
| Glen Ellyn | Purchased surface water | 28,500 | No | 0 |
| West Chicago | Groundwater | 25,166 | No | 0 |
| Lisle | Purchased surface water | 24,223 | No | 0 |
Which one is yours? A county usually has several utilities. Your bill or your utility's annual water-quality report names yours. Population is for the whole system, which can cross county lines.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.