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St. Landry Parish, LA

Moderate Risk (38/100)

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 St. Landry Parish in Louisiana · Population: 82,128

TRI sites such as Alon Refining Krotz Springs Inc; Lemoyen LLC - Lemoyen Plant; SDWIS systems such as TOWN OF LEONVILLE WATER SYSTEM; LEWISBURG BELLEVUE WATER SYSTEM; PLAISANCE WATER SYSTEM anchor St. Landry Parish, LA's EPA extract. Derived burden score 38/100 (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. Landry Parish include TOWN OF LEONVILLE WATER SYSTEM; PLAISANCE WATER SYSTEM; PRAIRIE RONDE WATER SYSTEM INC, while Alon Refining Krotz Springs Inc leads reported TRI pounds among local Form R filers. No AQS county monitors report here.

Burden score 38/100 (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. Landry 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. Landry Parish, LA: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

+3.6%

2 facilities that filed in 2022 and 2023

Whole inventory

+3.6%

494.5 thousand lb → 512.2 thousand lb, every facility that filed

  • St. Landry Parish, LA's total reported releases rose from 494.5 thousand lb in 2022 to 512.2 thousand lb in 2023, based on EPA TRI filings.
  • St. Landry Parish, LA's water releases rose from 234.4 thousand lb in 2022 to 264.0 thousand lb in 2023, based on EPA TRI filings.
  • St. Landry Parish, LA's off-site transfers fell from 7.5 thousand lb in 2022 to 6.7 thousand lb in 2023, based on EPA TRI filings.
  • St. Landry Parish, LA's air releases fell from 252.5 thousand lb in 2022 to 241.5 thousand lb in 2023, based on EPA TRI filings.
County population (Census ACS)
82,128
TRI Facilities
2
Water Systems
25
Superfund Sites
0
Total Releases
2.3M lbs

Water Systems (25)

System System pop (SDWIS) Violations
TOWN OF LEONVILLE WATER SYSTEM 9,552 8
LEWISBURG BELLEVUE WATER SYSTEM 8,226 0
PLAISANCE WATER SYSTEM 6,465 2
PRAIRIE RONDE WATER SYSTEM INC 6,090 4
ST LANDRY WATER WORKS DISTRICT 2 RURAL 4,761 2
UNITED WATER SYSTEM 4,446 58
TOWN OF SUNSET WATER SYSTEM 4,356 18
TOWN OF ARNAUDVILLE WATER SYSTEM 3,957 1
TOWN OF PORT BARRE WATER SYSTEM 3,828 0
LAWTELL WATER WORKS DISTRICT NO 1 3,717 3
VILLAGE OF CANKTON WATER SYSTEM 2,730 10
VILLAGE OF PALMETTO WATER SYSTEM 2,178 63
TOWN OF KROTZ SPRINGS WATER SYSTEM 2,130 0
ST LANDRY WWD 3 PORT BARRE AREA D 1,860 1
TOWN OF WASHINGTON WATER SYSTEM 1,713 9
GREENBRIAR PRAIRIE BASSE WATER SYSTEM 1,656 2
TOWN OF GRAND COTEAU WATER SYSTEM 1,650 17
MORROW WATER SYSTEM INC 1,572 0
TOWN OF MELVILLE WATER SYSTEM 1,314 5
ST LANDRY WATERWORKS DISTRICT NO. 5 519 0
ST LANDRY WWD 3 PORT BARRE AREA B 516 14
ST LANDRY WWD 3 PORT BARRE AREA C 351 0
ST LANDRY WWD 3 PORT BARRE AREA A 270 0
HIDDEN HILLS SUBDIVISION WATER SYSTEM 240 17
MIDWAY WATER SYSTEM INC 192 11

TRI Facilities (2)

# Facility Total Releases
1 Alon Refining Krotz Springs Inc 2.3M lbs
2 Lemoyen LLC - Lemoyen Plant 0 lbs

Cities in St. Landry Parish (13)

Krotz Springs
1 facilities · 2 water
Morrow
1 facilities · 1 water
Port Barre
0 facilities · 5 water
Arnaudville
0 facilities · 3 water
Opelousas
0 facilities · 3 water
Sunset
0 facilities · 3 water
Lawtell
0 facilities · 2 water
Melville
0 facilities · 2 water
Cankton
0 facilities · 1 water
Grand Coteau
0 facilities · 1 water
Leonville
0 facilities · 1 water
Palmetto
0 facilities · 1 water
Washington
0 facilities · 1 water

Frequently Asked Questions

What is the environmental risk level in St. Landry Parish, Louisiana? ▼
St. Landry Parish, LA has an environmental risk score of 38/100 (Moderate Risk), based on 2 TRI facilities, 0 Superfund sites, and 25 water systems on record. 18 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in St. Landry Parish? ▼
No Superfund National Priorities List (NPL) sites are currently registered in St. Landry Parish, LA in the EPA database.
How many toxic release facilities are in St. Landry Parish? ▼
St. Landry Parish, LA has 2 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 2.3M lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in St. Landry Parish? ▼
Air quality monitoring data (EPA AQS) is not available for St. Landry Parish, LA. This may indicate no EPA monitoring stations are located in the county. For regional air quality data, see the state environmental profile or visit EPA's AirNow.gov.
Is the drinking water safe in St. Landry Parish? ▼
St. Landry Parish, LA has 25 EPA-regulated water systems. 18 systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental agencies cover St. Landry Parish? ▼
Environmental compliance in St. Landry Parish, Louisiana is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Louisiana state environmental agency. Facilities report to the EPA Toxic Release Inventory, water systems are regulated under the Safe Drinking Water Act, and contaminated sites are managed under the Superfund program. Contact your state environmental agency for local concerns.

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.

Related Guides

Understanding EPA Data
How EPA collects and publishes environmental data
Environmental Justice
Who lives near polluters and environmental hazards
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro