Missouri tap water
6 of 225 Missouri water systems with full PFAS testing (3%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 1,434 active community water systems in the EPA file; 202 serve 3,300+ people and have a full PFAS set.
- 202 systems had at least one health-based violation since 2021-10-26.
- 2 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Mo American St Louis St Charles Counties | 1,111,000 | No | 0 |
| Kansas City PWS | 553,295 | No | 0 |
| St Louis City PWS | 304,709 | No | 0 |
| City Utilities of Springfield | 210,898 | No | 0 |
| City of Columbia Utilities | 126,254 | No | 0 |
| Independence PWS | 120,000 | No | 0 |
| St Charles County Pwsd 2 | 100,587 | No | 0 |
| Lees Summit PWS | 99,400 | No | 0 |
Counties
Jefferson County14 systems with full PFAS testingJackson County13 systems with full PFAS testingClay County10 systems with full PFAS testing
All 14 utilities with a page in Missouri
- Blue Springs PWS 61,084
- City of Columbia Utilities 126,254
- City Utilities of Springfield 210,898
- Independence PWS 120,000
- Kansas City PWS 553,295
- Lees Summit PWS 99,400
- Mo American Joplin 73,728
- Mo American St Joseph 89,171
- Mo American St Louis St Charles Counties 1,111,000
- St Charles County Pwsd 2 100,587
- St Charles PWS 78,961
- St Louis City PWS 304,709
- St Peters PWS 52,575
- Wentzville PWS 41,784
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
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.