Iberville 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 Iberville Parish in Louisiana · Population: 29,950
TRI sites such as Flopam Inc; Syngenta Crop Protection LLC Saint Gabriel Facility; The Dow Chemical Co - Louisiana Operations; SDWIS systems such as CITY OF PLAQUEMINE WATER SYSTEM; TOWN OF MARINGOUIN; TOWN OF WHITE CASTLE WATER SYSTEM; NPL sites such as Bayou Sorrel anchor Iberville Parish, LA's EPA extract. Derived burden score 67/100 (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 Iberville Parish include TOWN OF MARINGOUIN; TOWN OF WHITE CASTLE WATER SYSTEM; VILLAGE OF GROSSE TETE WATER SYSTEM, while Flopam Inc leads reported TRI pounds among local Form R filers. AQS median AQI 41 / peak 159 in 2024.
Burden score 67/100 (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 Iberville 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 Iberville Parish, LA: EPA TRI 2023 reporting year
Same facilities, both years
+9.8%
24 facilities that filed in 2022 and 2023
Whole inventory
+9.8%
10.5 million lb → 11.5 million lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 2 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Iberville Parish, LA's total reported releases rose from 10.5 million lb in 2022 to 11.5 million lb in 2023, based on EPA TRI filings.
- Iberville Parish, LA's land releases fell from 217.9 thousand lb in 2022 to 124.7 thousand lb in 2023, based on EPA TRI filings.
- Iberville Parish, LA's off-site transfers rose from 1.6 million lb in 2022 to 1.9 million lb in 2023, based on EPA TRI filings.
- Iberville Parish, LA's air releases rose from 6.5 million lb in 2022 to 7.6 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 | 270 (74%) | 86 | 8 | 159 |
| 2023 | 253 (69%) | 99 | 12 | 154 |
| 2022 | 267 (73%) | 91 | 6 | 156 |
| 2021 | 299 (82%) | 63 | 3 | 129 |
| 2020 | 306 (84%) | 57 | 3 | 136 |
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 (6)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| CITY OF PLAQUEMINE WATER SYSTEM | 14,043 | 0 |
| TOWN OF MARINGOUIN | 3,300 | 1 |
| TOWN OF WHITE CASTLE WATER SYSTEM | 2,550 | 11 |
| VILLAGE OF GROSSE TETE WATER SYSTEM | 954 | 3 |
| VILLAGE OF ROSEDALE WATER SYSTEM | 664 | 17 |
| GILLIS LONG CENTER | 600 | 2 |
TRI Facilities (26)
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Bayou Sorrel | Deleted NPL Site | 34.69 |
Cities in Iberville Parish (8)
Frequently Asked Questions
What is the environmental risk level in Iberville Parish, Louisiana? ▼
Are there Superfund sites in Iberville Parish? ▼
How many toxic release facilities are in Iberville Parish? ▼
What is the air quality in Iberville Parish? ▼
Is the drinking water safe in Iberville Parish? ▼
What environmental agencies cover Iberville 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.