St. Mary 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. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.
Environmental data for St. Mary Parish in Louisiana · Population: 48,455
TRI sites such as Cabot Corp Canal Plant; Bollinger Marine Fabricators LLC; Orion Engineered Carbons-Ivanhoe Carbon Black Plant; SDWIS systems such as WATER & SEWER COMMISSION 4 OF ST MARY; CITY OF PATTERSON WATER SYSTEM; CITY OF FRANKLIN WATER SUPPLY anchor St. Mary Parish, LA's EPA extract. Derived burden score 54/100 (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. Mary Parish include WATER & SEWER COMMISSION 4 OF ST MARY; CITY OF PATTERSON WATER SYSTEM; CITY OF FRANKLIN WATER SUPPLY, while Cabot Corp Canal Plant leads reported TRI pounds among local Form R filers. No AQS county monitors report here.
Burden score 54/100 (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. Mary 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. Mary Parish, LA: EPA TRI 2023 reporting year
Same facilities, both years
+5.5%
12 facilities that filed in 2022 and 2023
Whole inventory
+5.5%
1.0 million lb → 1.1 million lb, every facility that filed
Between the two reporting years, 2 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- St. Mary Parish, LA's total reported releases rose from 1.0 million lb in 2022 to 1.1 million lb in 2023, based on EPA TRI filings.
- St. Mary Parish, LA's off-site transfers rose from 70.3 thousand lb in 2022 to 116.0 thousand lb in 2023, based on EPA TRI filings.
- St. Mary Parish, LA's land releases fell from 817 lb in 2022 to 472 lb in 2023, based on EPA TRI filings.
- St. Mary Parish, LA's water releases rose from 453 lb in 2022 to 551 lb in 2023, based on EPA TRI filings.
Water Systems (8)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| WATER & SEWER COMMISSION 4 OF ST MARY | 9,709 | 15 |
| CITY OF PATTERSON WATER SYSTEM | 8,456 | 9 |
| CITY OF FRANKLIN WATER SUPPLY | 8,325 | 191 |
| ST MARY WATER & SEWER COMM #3 | 7,828 | 4 |
| ST MARY PARISH W&S #2 BAYOU VISTA | 5,379 | 0 |
| ST MARY PARISH WATER SEWERAGE COMM 1 | 2,823 | 4 |
| PORT OF WEST ST MARY | 400 | 16 |
| BERWICK BAYOU VISTA WW COMMISSION | 0 | 5 |
TRI Facilities (17)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Cabot Corp Canal Plant | 2.6M lbs |
| 2 | Bollinger Marine Fabricators LLC | 804.5K lbs |
| 3 | Orion Engineered Carbons-Ivanhoe Carbon Black Plant | 400.0K lbs |
| 4 | Cameron International Corp | 293.7K lbs |
| 5 | Birla Carbon USA Inc | 179.3K lbs |
| 6 | Conrad Shipyard LLC (deepwater Yard) | 164.8K lbs |
| 7 | Azz Galvanizing - Morgan City | 76.7K lbs |
| 8 | Cameron International Corp | 68.1K lbs |
| 9 | Pelican Processing Plant | 7.7K lbs |
| 10 | Enterprise Gas Processing LLC - Neptune Gas Plant | 4.5K lbs |
| 11 | New Industries LLC | 235 lbs |
| 12 | Twin Brothers Marine LLC | 103 lbs |
| 13 | Conrad Shipyard LLC (main Yard) | 65 lbs |
| 14 | Conrad Shipyard Amelia LLC | 61 lbs |
| 15 | Baker Hughes Oilfield Operations LLC | 3 lbs |
| 16 | D & D Welding/fab Inc. | 0 lbs |
| 17 | Halliburton Berwick Baroid | 0 lbs |
Cities in St. Mary Parish (7)
Frequently Asked Questions
What is the environmental risk level in St. Mary Parish, Louisiana? ▼
Are there Superfund sites in St. Mary Parish? ▼
How many toxic release facilities are in St. Mary Parish? ▼
What is the air quality in St. Mary Parish? ▼
Is the drinking water safe in St. Mary Parish? ▼
What environmental agencies cover St. Mary 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.