County · Louisiana
St. Tammany Parish, Louisiana: drinking water records
This overview covers 16 ZIP codes and 66 community water systems in St. Tammany Parish. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Slidell Water Supply LA1103041 | 35,547 | 420 | 0 | 1 | 0 ppb |
| City of Covington Water Supply LA1103011 | 16,185 | 180 | 0 | 1 | 0 ppb |
| St Tam Parish - Cross Gates Sd LA1103053 | 8,037 | 120 | 1 | 1 | 0 ppb |
| Town of Abita Springs Water System LA1103002 | 3,693 | 120 | 0 | 1 | 2 ppb |
| Folsom Water Supply LA1103014 | 1,992 | 180 | 0 | 1 | 0 ppb |
| St Tam Parish- Bedico -Faubourg-Coquille LA1103149 | 18,372 | 300 | 0 | 0 | 0 ppb |
| St Tam Parish - Briarwood Terrace LA1103079 | 17,536 | 300 | 0 | 0 | 2 ppb |
| City of Mandeville Water Supply LA1103023 | 13,000 | 180 | 0 | 0 | 0 ppb |
| Utilities INC - North Park Water Supply LA1103124 | 11,298 | 271 | 0 | 0 | 0 ppb |
| Bayou Liberty Water Association LA1103005 | 10,791 | 120 | 0 | 0 | 1 ppb |
| Lee Road Water Corporation LA1103020 | 7,665 | 120 | 0 | 0 | 0 ppb |
| Utilities INC - Kingspoint Subdivision LA1103055 | 6,351 | 120 | 0 | 0 | 0 ppb |
| St Tammany Water District #2 LA1103033 | 5,200 | 60 | 0 | 0 | 0 ppb |
| Beau Chene Water System LA1103006 | 4,650 | 120 | 0 | 0 | 0 ppb |
| Town of Pearl River LA1103157 | 3,333 | 120 | 0 | 0 | 0 ppb |
| Utilities INC - Green Brier Water Supply LA1103130 | 2,250 | 0 | 0 | 2 | 0.8 ppb |
| Utilities INC - Magnolia Forest Subd LA1103054 | 1,635 | 0 | 0 | 1 | 0.8 ppb |
| Tchefuncta Club Estates LA1103043 | 1,245 | 0 | 0 | 2 | 0.5 ppb |
| Lake Ramsey LA1103139 | 840 | 0 | 0 | 7 | 2 ppb |
| Village of Sun Water Supply LA1103038 | 726 | 0 | 0 | 11 | 2 ppb |
| Ponderosa Ranches Subdivision LA1103077 | 579 | 0 | 0 | 8 | 0 ppb |
| Marina del Ray Water System LA1103123 | 500 | 0 | 0 | 1 | 1 ppb |
| St Tam Parish - Northlake Behavioral LA1103039 | 480 | 0 | 0 | 2 | 5 ppb |
| Village Guthrie Subdivision LA1103066 | 405 | 0 | 0 | 1 | 0 ppb |
| Central Park Subdivision LA1103088 | 342 | 0 | 0 | 5 | 1.5 ppb |
ZIP reports in St. Tammany Parish
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 70457, 70464.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.