St. John The Baptist 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. John The Baptist Parish in Louisiana · Population: 41,342
TRI sites such as Dupont Pontchartrain Works; Marathon Petroleum Co LP; Pinnacle Polymers; SDWIS systems such as ST JOHN WATER DISTRICT 3; ST JOHN WATER DISTRICT 1; ST JOHN WATER DISTRICT 2 anchor St. John The Baptist Parish, LA's EPA extract. Derived burden score 47/100 (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. John The Baptist Parish include ST JOHN WATER DISTRICT 1; ST JOHN WATER DISTRICT 2; PLEASURE BEND WATER SUPPLY, while Dupont Pontchartrain Works leads reported TRI pounds among local Form R filers. AQS median AQI 36 / peak 105 in 2024.
Burden score 47/100 (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. John The Baptist 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. John The Baptist Parish, LA: EPA TRI 2023 reporting year
Same facilities, both years
-0.7%
11 facilities that filed in 2022 and 2023
Whole inventory
-0.7%
2.2 million lb → 2.2 million lb, every facility that filed
- St. John The Baptist Parish, LA's total reported releases fell from 2.2 million lb in 2022 to 2.2 million lb in 2023, based on EPA TRI filings.
- St. John The Baptist Parish, LA's off-site transfers rose from 61.6 thousand lb in 2022 to 68.3 thousand lb in 2023, based on EPA TRI filings.
- St. John The Baptist Parish, LA's air releases rose from 742.6 thousand lb in 2022 to 819.7 thousand lb in 2023, based on EPA TRI filings.
- St. John The Baptist Parish, LA's land releases fell from 1.1 million lb in 2022 to 1.1 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 | 320 (89%) | 37 | 2 | 105 |
| 2023 | 315 (88%) | 39 | 4 | 112 |
| 2022 | 335 (95%) | 16 | 0 | 80 |
| 2021 | 327 (97%) | 8 | 1 | 108 |
| 2020 | 341 (97%) | 10 | 0 | 80 |
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 (4)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| ST JOHN WATER DISTRICT 3 | 31,965 | 0 |
| ST JOHN WATER DISTRICT 1 | 10,484 | 12 |
| ST JOHN WATER DISTRICT 2 | 3,702 | 1 |
| PLEASURE BEND WATER SUPPLY | 528 | 36 |
TRI Facilities (12)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Dupont Pontchartrain Works | 5.1M lbs |
| 2 | Marathon Petroleum Co LP | 3.6M lbs |
| 3 | Pinnacle Polymers | 489.0K lbs |
| 4 | Denka Performance Elastomer LLC | 427.8K lbs |
| 5 | Air Products & Chemicals Inc - Garyville Smr | 129.4K lbs |
| 6 | Evonik Corp | 89.6K lbs |
| 7 | Clariant Corporation - Reserve Site | 71.2K lbs |
| 8 | Mt. Airy Terminal LLC | 63.4K lbs |
| 9 | Nalco Co | 51.3K lbs |
| 10 | Stockhausen Superabsorber LLC | 31.1K lbs |
| 11 | Pvs Dx Inc. | 563 lbs |
| 12 | Championx -- Garyville Facility | 542 lbs |
Cities in St. John The Baptist Parish (4)
Frequently Asked Questions
What is the environmental risk level in St. John The Baptist Parish, Louisiana? ▼
Are there Superfund sites in St. John The Baptist Parish? ▼
How many toxic release facilities are in St. John The Baptist Parish? ▼
What is the air quality in St. John The Baptist Parish? ▼
Is the drinking water safe in St. John The Baptist Parish? ▼
What environmental agencies cover St. John The Baptist 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.