PlainEnviro

St. Mary Parish, LA

Moderate Risk (54/100)

A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.

Environmental data for St. Mary Parish in Louisiana · Population: 48,455

St. Mary Parish, LA is tracked across three EPA datasets covering 17 Toxics Release Inventory (TRI) facilities, 8 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 54/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.

Industrial disclosures inside the county total 4.6M lbs of reported toxic releases under EPCRA Section 313, while 7 water systems carry an active health-based violation in the SDWIS record. No EPA Air Quality System monitors currently report data for this county.

All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.

Population
48,455
TRI Facilities
17
Water Systems
8
Superfund Sites
0
Total Releases
4.6M lbs

Water Systems (8)

System Population Violations
WATER & SEWER COMMISSION 4 OF ST MARY 9,709 10
PATTERSON WATER SYSTEM 8,456 7
FRANKLIN WATER SUPPLY 8,325 153
ST MARY WATER & SEWER COMM #3 7,500 3
ST MARY PARISH W&S #2 BAYOU VISTA 5,379 0
ST MARY PARISH WATER SEWERAGE COMM 1 2,823 3
PORT OF WEST ST MARY 400 15
BERWICK BAYOU VISTA WW COMMISSION 0 5

TRI Facilities (17)

# Facility Total Releases
1 Cabot Corp Canal Plant 2.6M lbs
2 Bollinger Marine Fabricators LLC 804.5K lbs
3 Orion Engineered Carbons-Ivanhoe Carbon Black Plant 400.0K lbs
4 Cameron International Corp 293.7K lbs
5 Birla Carbon USA Inc 179.3K lbs
6 Conrad Shipyard LLC (deepwater Yard) 164.8K lbs
7 Azz Galvanizing - Morgan City 76.7K lbs
8 Cameron International Corp 68.1K lbs
9 Pelican Processing Plant 7.7K lbs
10 Enterprise Gas Processing LLC - Neptune Gas Plant 4.5K lbs
11 New Industries LLC 235 lbs
12 Twin Brothers Marine LLC 103 lbs
13 Conrad Shipyard LLC (main Yard) 65 lbs
14 Conrad Shipyard Amelia LLC 61 lbs
15 Baker Hughes Oilfield Operations LLC 3 lbs
16 D & D Welding/fab Inc. 0 lbs
17 Halliburton Berwick Baroid 0 lbs

Cities in St. Mary Parish (6)

Amelia
Pop: -
1 facilities · 1 water
Bayou Vista
Pop: -
1 facilities · 0 water
Patterson
Pop: -
2 facilities · 2 water
Centerville
Pop: -
4 facilities · 1 water
Franklin
Pop: -
2 facilities · 2 water
Berwick
Pop: -
1 facilities · 2 water

Frequently Asked Questions

What is the environmental risk level in St. Mary Parish, Louisiana? ▼
St. Mary Parish, LA has an environmental risk score of 54/100 (Moderate Risk), based on 17 TRI facilities, 0 Superfund sites, and 8 water systems on record. 7 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in St. Mary Parish? ▼
No Superfund National Priorities List (NPL) sites are currently registered in St. Mary Parish, LA in the EPA database.
How many toxic release facilities are in St. Mary Parish? ▼
St. Mary Parish, LA has 17 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 4.6M lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in St. Mary Parish? ▼
Air quality monitoring data (EPA AQS) is not available for St. Mary 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. Mary Parish? ▼
St. Mary Parish, LA has 8 EPA-regulated water systems. 7 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. Mary Parish? ▼
Environmental compliance in St. Mary 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 Editorial