Lake County tap water
0 of 16 water systems serving Lake County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 30 community water systems list this county as served; 15 serve 3,300+ people with full PFAS testing.
- 4 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 |
|---|---|---|---|---|
| Indiana American Water - Northwest | Surface water | 210,510 | No | 0 |
| Hammond Water Works department | Surface water | 78,384 | No | 0 |
| Crown Point Water Works | Purchased surface water | 30,000 | No | 0 |
| Schererville Water department | Purchased surface water | 30,000 | No | 0 |
| East Chicago Water Works | Surface water | 26,370 | No | 0 |
| St. John Municipal Water Utility | Groundwater | 25,700 | No | 0 |
| Highland Water Works | Purchased surface water | 23,984 | No | 0 |
| Munster Water Company | Purchased surface water | 23,894 | No | 0 |
| Griffith Water department | Purchased surface water | 16,893 | No | 0 |
| Dyer Water department | Purchased surface water | 16,800 | No | 0 |
| Indiana American Water - Lowell | Groundwater under surface influence | 11,908 | No | 1 |
| Cuii - Twin Lakes | Groundwater | 8,000 | 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.