St. Tammany Parish, LA
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for St. Tammany Parish in Louisiana · Population: 269,331
TRI sites such as Arcosa Marine Products Inc Plt 1038; US Army National Guard - Camp Villere Range(s); Pavestone - New Orleans la Plant; SDWIS systems such as ST TAM PARISH- BEDICO -FAUBOURG-COQUILLE; ST TAM PARISH - BRIARWOOD TERRACE; CITY OF MANDEVILLE WATER SUPPLY; NPL sites such as Bayou Bonfouca; Madisonville Creosote Works; Southern Shipbuilding anchor St. Tammany Parish, LA's EPA extract. Derived burden score 51/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in St. Tammany Parish include ST TAM PARISH - CROSS GATES SD; UTILITIES INC - HAMMOND HEIGHTS; TOWN OF ABITA SPRINGS WATER SYSTEM, while Arcosa Marine Products Inc Plt 1038 leads reported TRI pounds among local Form R filers. AQS median AQI 39 / peak 186 in 2024.
Burden score 51/100 (Moderate Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for St. Tammany Parish -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for St. Tammany Parish, LA: EPA TRI 2023 reporting year
Same facilities, both years
-21.3%
3 facilities that filed in 2022 and 2023
Whole inventory
-21.3%
13.3 thousand lb → 10.5 thousand lb, every facility that filed
- St. Tammany Parish, LA's total reported releases fell from 13.3 thousand lb in 2022 to 10.5 thousand lb in 2023, based on EPA TRI filings.
- St. Tammany Parish, LA's land releases fell from 13.3 thousand lb in 2022 to 10.5 thousand lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 291 (80%) | 70 | 0 | 186 |
| 2023 | 248 (68%) | 116 | 1 | 105 |
| 2022 | 277 (76%) | 87 | 1 | 103 |
| 2021 | 288 (82%) | 64 | 0 | 71 |
| 2020 | 268 (74%) | 96 | 0 | 90 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Louisiana, see the EPA's AirNow.gov.
Water Systems (65)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| ST TAM PARISH- BEDICO -FAUBOURG-COQUILLE | 18,372 | 0 |
| ST TAM PARISH - BRIARWOOD TERRACE | 17,536 | 0 |
| CITY OF MANDEVILLE WATER SUPPLY | 13,000 | 0 |
| UTILITIES INC - NORTH PARK WATER SUPPLY | 11,298 | 0 |
| BAYOU LIBERTY WATER ASSOCIATION | 10,791 | 0 |
| ST TAM PARISH - CROSS GATES SD | 8,037 | 4 |
| LEE ROAD WATER CORPORATION | 7,665 | 0 |
| UTILITIES INC - KINGSPOINT SUBDIVISION | 6,351 | 0 |
| BEAU CHENE WATER SYSTEM | 4,650 | 0 |
| UTILITIES INC - HAMMOND HEIGHTS | 4,281 | 1 |
| TOWN OF ABITA SPRINGS WATER SYSTEM | 3,693 | 1 |
| TOWN OF PEARL RIVER | 3,333 | 0 |
| UTILITIES INC - LAKE VILLAGE SD | 2,724 | 0 |
| UTILITIES INC- WHITEHALL/ HEAD OF ISLAND | 2,676 | 1 |
| ST TAM PARISH PINELAND PARK SUBD | 2,500 | 0 |
| UTILITIES INC - FRENCH SETTLEMENT | 2,313 | 1 |
| UTILITIES INC - GREEN BRIER WATER SUPPLY | 2,250 | 2 |
| UTILITIES INC - HUNTWYCK VILLAGE | 2,088 | 0 |
| FOLSOM WATER SUPPLY | 1,992 | 3 |
| UTILITIES INC- SPRINGFIELD AREA | 1,914 | 0 |
| ST TAM PARISH -NORTHRIDGE ESTATES | 1,653 | 0 |
| UTILITIES INC - MAGNOLIA FOREST SUBD | 1,635 | 2 |
| UTILITIES INC - WOODRIDGE SUBDIVISION | 1,590 | 0 |
| UTILITIES INC - QUAIL RIDGE SUBDIVISION | 1,563 | 0 |
| UTILITIES INC - VELMA | 1,302 | 1 |
| TCHEFUNCTA CLUB ESTATES | 1,245 | 3 |
| COUNTRY PINES NORTH SUBDIVISION WS | 936 | 0 |
| ST TAM PARISH - RIVER OAKS | 933 | 0 |
| VILLAGES OF BOCAGE- MADISONVILLE | 894 | 0 |
| VILLAGE OF MADISONVILLE WATER SUPPLY | 871 | 0 |
| VILLAGE OF SUN WATER SUPPLY | 726 | 17 |
| UTILITIES INC - OAKMONT SUBD | 612 | 0 |
| ST TAM PARISH - ABITA LAKES | 609 | 0 |
| PINE CREST TRAILER PARK | 600 | 0 |
| COUNTRY PINES SOUTH SUBDIVISION WS | 570 | 0 |
| SPILLWAY ESTATES WATER SYSTEM | 501 | 109 |
| MARINA DEL RAY WATER SYSTEM | 500 | 2 |
| ST TAM PARISH - ALTON | 499 | 0 |
| ST TAM PARISH - NORTHLAKE BEHAVIORAL | 480 | 2 |
| JOYCE WATER SUPPLY | 474 | 70 |
| TAYLOR WATER SYSTEM | 318 | 0 |
| MANGANOS MOBILE HOME PARK | 234 | 0 |
| ST TAM PARISH - TAMANEND | 222 | 0 |
| ST TAM PARISH- BEN THOMAS RD | 220 | 1 |
| ST TAM PARISH SALVATION MANOR ST JOE | 171 | 0 |
| UTILITIES INC - BEAU VILLAGE | 165 | 1 |
| LACOMBE NURSING CENTRE | 150 | 0 |
| SOUTH CALCASIEU ESTATES SUBDIVISION W S | 144 | 0 |
| ST JOSEPH ABBEY | 127 | 5 |
| UTILITIES INC - OAKRIDGE | 123 | 0 |
| LAKEVIEW ESTATES SUBD WS | 120 | 0 |
| UTILITIES INC -BANKSTON | 120 | 0 |
| CREEK PLACE APARTMENTS | 100 | 4 |
| INDIAN HILLS TRAILER PARK | 100 | 2 |
| ST TAM PARISH - LAKE HILLS VILLAGE | 88 | 4 |
| ST TAM PARISH-MADISONVILLE WOODS | 87 | 0 |
| UTILITIES INC - NORTH FOLSOM HILLS | 81 | 1 |
| MT MORIAH WATER SYSTEM | 78 | 0 |
| OZONE PINE SUBDIVISION | 75 | 14 |
| ST TAM PARISH - ST GERTRUDE | 72 | 0 |
| PEARL PLANTATION TOWNHSE | 60 | 16 |
| LEWISBURG ESTATES | 60 | 6 |
| MADISONVILLE ON THE LAKE | 51 | 10 |
| ALEXANDER MILNE HOME FOR WOMEN | 42 | 0 |
| RICHLAND HEIGHTS SUBD WATER SYSTEM | 30 | 0 |
TRI Facilities (5)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Arcosa Marine Products Inc Plt 1038 | 92.0K lbs |
| 2 | US Army National Guard - Camp Villere Range(s) | 80.1K lbs |
| 3 | Pavestone - New Orleans la Plant | 0 lbs |
| 4 | Pebble Technology International | 0 lbs |
| 5 | Cmc Steel Fabricators Inc DBA Cmc Capitol Steel-Slidell | 0 lbs |
Superfund Sites (3)
| Site Name | Status | HRS Score |
|---|---|---|
| Bayou Bonfouca | NPL Site | 29.78 |
| Madisonville Creosote Works | NPL Site | 48.01 |
| Southern Shipbuilding | Deleted NPL Site | 50.00 |
Cities in St. Tammany Parish (9)
Frequently Asked Questions
What is the environmental risk level in St. Tammany Parish, Louisiana? ▼
Are there Superfund sites in St. Tammany Parish? ▼
How many toxic release facilities are in St. Tammany Parish? ▼
What is the air quality in St. Tammany Parish? ▼
Is the drinking water safe in St. Tammany Parish? ▼
What environmental agencies cover St. Tammany Parish? ▼
What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.