Terrebonne 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 Terrebonne Parish in Louisiana · Population: 107,362
TRI sites such as Laship LLC; Gulf Island Fabrication LLC; Vallourec Tube-Alloy LLC; NPL sites such as Delta Shipyard anchor Terrebonne Parish, LA's EPA extract. Derived burden score 33/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Laship LLC; Gulf Island Fabrication LLC; Vallourec Tube-Alloy LLC are among the largest Form R filers reporting in Terrebonne Parish; no SDWIS system here carries an active health-based flag. AQS median AQI 39 / peak 99 in 2024.
Burden score 33/100 (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 Terrebonne 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 Terrebonne Parish, LA: EPA TRI 2023 reporting year
Same facilities, both years
+7.0%
7 facilities that filed in 2022 and 2023
Whole inventory
+7.3%
44.1 thousand lb → 47.3 thousand lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Terrebonne Parish, LA's total reported releases rose from 44.1 thousand lb in 2022 to 47.2 thousand lb in 2023, based on EPA TRI filings.
- Terrebonne Parish, LA's water releases fell from 28 lb in 2022 to 0 lb in 2023, based on EPA TRI filings.
- Terrebonne Parish, LA's off-site transfers fell from 3.3 thousand lb in 2022 to 1.4 thousand lb in 2023, based on EPA TRI filings.
- Terrebonne Parish, LA's air releases rose from 40.8 thousand lb in 2022 to 45.8 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 | 85 (69%) | 38 | 0 | 99 |
| 2023 | 77 (67%) | 35 | 2 | 176 |
| 2022 | 90 (74%) | 31 | 0 | 96 |
| 2021 | 89 (81%) | 21 | 0 | 64 |
| 2020 | 92 (77%) | 28 | 0 | 77 |
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.
TRI Facilities (10)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Laship LLC | 154.8K lbs |
| 2 | Gulf Island Fabrication LLC | 25.7K lbs |
| 3 | Vallourec Tube-Alloy LLC | 7.0K lbs |
| 4 | Bollinger Houma Shipyards LLC | 2.0K lbs |
| 5 | Oil States Industries - Houma | 1.7K lbs |
| 6 | National Oilwell Varco LP | 110 lbs |
| 7 | Gulf Island Services LLC | 60 lbs |
| 8 | Howco Metals Management LLC | 0 lbs |
| 9 | Performance Energy Services LLC | 0 lbs |
| 10 | Hunting Energy Services LLC | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Delta Shipyard | NPL Site | 48.05 |
Cities in Terrebonne Parish (3)
Frequently Asked Questions
What is the environmental risk level in Terrebonne Parish, Louisiana? ▼
Are there Superfund sites in Terrebonne Parish? ▼
How many toxic release facilities are in Terrebonne Parish? ▼
What is the air quality in Terrebonne Parish? ▼
Is the drinking water safe in Terrebonne Parish? ▼
What environmental agencies cover Terrebonne 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.