Ascension 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 Ascension Parish in Louisiana · Population: 128,593
TRI sites such as Cf Industries Nitrogen LLC; Rubicon LLC; Basf Corp; SDWIS systems such as CITY OF GONZALES WATER SYSTEM; PARISH UTILITIES OF ASCENSION; ASCENSION CONSOLIDATED UTILITY DIST 1; NPL sites such as Cleve Reber; Dutchtown Treatment Plant; Old Inger Oil Refinery anchor Ascension Parish, LA's EPA extract. Derived burden score 80/100 (High 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 Ascension Parish include PARISH UTILITIES OF ASCENSION; ASCENSION CONSOLIDATED UTILITY DIST 1; FAIRVIEW MOBILE ESTATES NORTH WS, while Cf Industries Nitrogen LLC leads reported TRI pounds among local Form R filers. AQS median AQI 33 / peak 151 in 2024.
Burden score 80/100 (High 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 Ascension 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 Ascension Parish, LA: EPA TRI 2023 reporting year
Same facilities, both years
-12.2%
24 facilities that filed in 2022 and 2023
Whole inventory
-12.1%
24.4 million lb → 21.4 million lb, every facility that filed
Between the two reporting years, 2 facilities filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Ascension Parish, LA's total reported releases fell from 24.4 million lb in 2022 to 21.4 million lb in 2023, based on EPA TRI filings.
- Ascension Parish, LA's land releases fell from 7.9 million lb in 2022 to 5.5 million lb in 2023, based on EPA TRI filings.
- Ascension Parish, LA's off-site transfers rose from 601.5 thousand lb in 2022 to 743.3 thousand lb in 2023, based on EPA TRI filings.
- Ascension Parish, LA's air releases fell from 12.7 million lb in 2022 to 12.0 million 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 | 331 (92%) | 26 | 2 | 151 |
| 2023 | 310 (86%) | 49 | 2 | 154 |
| 2022 | 336 (92%) | 28 | 0 | 90 |
| 2021 | 338 (95%) | 16 | 1 | 159 |
| 2020 | 350 (96%) | 14 | 0 | 100 |
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 (24)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| CITY OF GONZALES WATER SYSTEM | 16,806 | 0 |
| PARISH UTILITIES OF ASCENSION | 9,732 | 14 |
| ASCENSION CONSOLIDATED UTILITY DIST 1 | 2,229 | 34 |
| DIVERSION WATER- WATER FRONT WEST | 1,548 | 0 |
| DIVERSION WATER RIVER HIGHLANDS | 1,356 | 0 |
| DIVERSION WATER - TERRY HARBOR CAMPSITES | 969 | 0 |
| FAIRVIEW MOBILE ESTATES NORTH WS | 669 | 2 |
| DIVERSION WATER - MONTROSE SUBDIVISION | 591 | 0 |
| DIVERSION WATER - BAYOU ESTATES | 450 | 0 |
| FAIRVIEW MOBILE ESTATES SOUTH WS | 378 | 1 |
| DIVERSION WATER - CHINQUAPIN | 327 | 0 |
| DIVERSION WATER - OLD MILL SETTLEMENT | 246 | 0 |
| DIVERSION WATER - STONEHILL | 225 | 0 |
| CHAHTA MOBILE HOME PARK | 180 | 2 |
| DIVERSION WATER - CYPRESS POINT | 114 | 0 |
| DIVERSION WATER - CYPRESS LAKES | 111 | 0 |
| JIMMY BABIN APARTMENTS | 96 | 5 |
| DIVERSION WATER- OLIVIA ROSE | 96 | 0 |
| BIG BRANCH TRAILER PARK | 92 | 3 |
| FAMILY COURT MOBILE HOME PARK | 80 | 10 |
| TREYVILLE COURTS TRAILER PARK | 69 | 2 |
| DIVERSION WATER - RIVER RUN ESTATES | 69 | 0 |
| ST AMANT TRAILER PARK | 69 | 0 |
| SALT BAYOU KAMPGROUND - VISTA SITES | 25 | 4 |
TRI Facilities (29)
Superfund Sites (3)
| Site Name | Status | HRS Score |
|---|---|---|
| Cleve Reber | Deleted NPL Site | 48.80 |
| Dutchtown Treatment Plant | Deleted NPL Site | 36.41 |
| Old Inger Oil Refinery | Deleted NPL Site | 0.00 |
Cities in Ascension Parish (10)
Frequently Asked Questions
What is the environmental risk level in Ascension Parish, Louisiana? ▼
Are there Superfund sites in Ascension Parish? ▼
How many toxic release facilities are in Ascension Parish? ▼
What is the air quality in Ascension Parish? ▼
Is the drinking water safe in Ascension Parish? ▼
What environmental agencies cover Ascension 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.