Seminole County tap water
2 of 15 water systems serving Seminole County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 38 community water systems list this county as served; 15 serve 3,300+ people with full PFAS testing.
- 3 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 |
|---|---|---|---|---|
| Sanford, City of (2 Wps) | Groundwater | 79,715 | No | 0 |
| Seminole County Southeast | Groundwater | 70,040 | No | 0 |
| Casselberry, City of (3 Wps) | Groundwater | 54,747 | No | 0 |
| Altamonte Springs Water dept (2 Wps) | Groundwater | 51,000 | No | 0 |
| Oviedo, City of | Groundwater | 47,933 | No | 0 |
| Sanlando (3 Wtps) | Groundwater | 36,953 | No | 0 |
| Winter Springs, City of (3 Wps) | Groundwater | 34,657 | Yes | 0 |
| Seminole County Northwest | Groundwater | 31,986 | No | 3 |
| Longwood, City of (2 Wps) | Groundwater | 23,237 | No | 0 |
| Seminole County Northeast | Groundwater | 19,925 | No | 0 |
| Lake Mary, City of | Groundwater | 17,066 | No | 0 |
| Seminole County Southwest | Groundwater | 9,622 | 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.