PFAS · Mississippi
PFAS in Mississippi drinking water: EPA’s final survey results
EPA’s national PFAS survey (UCMR 5) tested 235 of the community water systems that serve homes in Mississippi. 9 found at least one of 29 PFAS above the laboratory reporting level, and 5 had a PFOA or PFOS sampling-location yearly average at or above EPA’s 4.0 ppt limit. Samples were collected from January 2023 to March 2026.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
PFOS was the compound Mississippi community systems found most often: 6 of 235 tested systems measured it above the reporting level. Across the country, 35% of surveyed community systems found at least one PFAS; in Mississippi the share is 4%. The largest Mississippi system with a detection, City of Oxford, serves 28,500 people and found 9 of the 29 compounds.
Which PFAS were found most often in Mississippi
Each row counts the Mississippi community water systems where that compound was measured above the reporting level at least once. A detection is a measurement, not a violation: most of these compounds have no federal limit.
| Compound | Systems where found | Systems tested | Share |
|---|---|---|---|
| PFOS | 6 | 235 | 3% |
| PFOA | 5 | 235 | 2% |
| PFBS | 4 | 235 | 2% |
| PFBA | 3 | 235 | 1% |
| PFHxA | 3 | 235 | 1% |
| PFHxS | 3 | 235 | 1% |
| 6:2 FTS | 2 | 235 | 1% |
| PFHpA | 2 | 235 | 1% |
| PFPeA | 2 | 235 | 1% |
Mississippi systems with the most PFAS found
The 9 surveyed community water systems that found the most different PFAS, with PFOA and PFOS compared to EPA’s 4.0 ppt limits on the yearly average at the highest sampling location. Larger systems come first when counts tie.
| Water system | People served | PFAS found (of 29) | PFOA | PFOS |
|---|---|---|---|---|
| City of Oxford MS0360011 | 28,500 | 9 | 4.4 ppt at or above the MCL | 52.9 ppt at or above the MCL |
| University of Mississippi MS0360015 | 26,874 | 8 | 5.3 ppt at or above the MCL | 2.1 ppt below the MCL |
| City of Corinth MS0020002 | 15,000 | 5 | 4.2 ppt at or above the MCL | 5.3 ppt at or above the MCL |
| City of Holly Springs MS0470002 | 9,779 | 3 | 6.5 ppt at or above the MCL | 9.5 ppt at or above the MCL |
| City of Brookhaven MS0430002 | 12,513 | 1 | — not detected above the reporting level | — not detected above the reporting level |
| Keesler Air Force Base MS0240049 | 8,006 | 1 | — not detected above the reporting level | 3.9 ppt below the MCL |
| Sunrise Utility Assn INC MS0180013 | 6,067 | 1 | 2.8 ppt below the MCL | — not detected above the reporting level |
| Smiths Crossing Water Assn MS0640014 | 4,480 | 1 | — not detected above the reporting level | 5.4 ppt at or above the MCL |
| Broadmoor Utilities, INC MS0010005 | 1,185 | 1 | — not detected above the reporting level | — not detected above the reporting level |
Counties with the most systems that found PFAS
- Lafayette County 2 of 3 surveyed systems
- Harrison County 1 of 11 surveyed systems
- Forrest County 1 of 7 surveyed systems
- Alcorn County 1 of 4 surveyed systems
- Simpson County 1 of 3 surveyed systems
- Lincoln County 1 of 3 surveyed systems
- Adams County 1 of 4 surveyed systems
- Marshall County 1 of 3 surveyed systems