St. Tammany Parish, LA
The federal environmental record for St. Tammany Parish (population 275,583): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
3
Superfund NPL sites
7
federal cleanup sites
1
PFAS-detecting water systems
3
TRI facilities
9
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Bayou Bonfouca | Slidell | on the NPL | 09/08/1983 |
| Madisonville Creosote Works | Madisonville | on the NPL | 12/23/1996 |
| Southern Shipbuilding | Slidell | deleted | 05/26/1995 |
Drinking water: PFAS testing
Public water systems serving St. Tammany with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| ST TAM PARISH - CROSS GATES SD LA1103053 | 6:2 FTS: 8.2 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
3 facilities in St. Tammany filed TRI reports for 2024, totalling 10k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| US ARMY NATIONAL GUARD - CAMP VILLERE RANGE(S) | SLIDELL | Lead | 10k lb |
| PEBBLE TECHNOLOGY INTERNATIONAL | SLIDELL | Lead And Lead Compounds | 0 lb |
| PAVESTONE - NEW ORLEANS LA PLANT | LACOMBE | Lead | 0 lb |
Underground fuel tanks
EPA's UST Finder records 418 tank facilities in St. Tammany: 343 tanks in service and 856 closed. 212 fuel releases are on record, of which 9 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps St. Tammany as Zone 3, the lowest predicted indoor radon (under 2 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for St. Tammany, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- BAYOU BONFOUCASLIDELL
- MADISONVILLE CREOSOTE WORKSMADISONVILLE
- SLIDELL AREA HOUSESLIDELL
- SLIDELL DRUM SITESLIDELL
- SLIDELL MERCURYSLIDELL
- SOUTHERN SHIPBUILDINGSLIDELL
- TULANE REGIONAL PRIMATE RESEARCH CENTERCOVINGTON