St. Mary Parish, LA
The federal environmental record for St. Mary Parish (population 47,055): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
0
federal cleanup sites
6
PFAS-detecting water systems
14
TRI facilities
11
open tank releases
Drinking water: PFAS testing
Public water systems serving St. Mary with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| FRANKLIN WATER SUPPLY LA1101003 | PFBA: 6.6 ng/L | detected |
| PATTERSON WATER SYSTEM LA1101006 | PFBA: 6.1 ng/L PFPeA: 3.2 ng/L | detected |
| ST MARY WATER & SEWER COMM #3 LA1101010 | PFBA: 5.4 ng/L | detected |
| WATER & SEWER COMMISSION 4 OF ST MARY LA1101011 | PFBA: 22.9 ng/L | detected |
| TOWN OF BERWICK LA1101014 | PFBA: 6.3 ng/L | detected |
| ST MARY PARISH W&S #2 BAYOU VISTA LA1101015 | PFBA: 6.9 ng/L PFPeA: 3.1 ng/L PFHxA: 3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
14 facilities in St. Mary filed TRI reports for 2024, totalling 919k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| CABOT CORP CANAL PLANT | CENTERVILLE | Hydrogen sulfide, Carbon disulfide | 585k lb |
| BOLLINGER MARINE FABRICATORS LLC | AMELIA | Propylene, Xylene (mixed isomers) | 133k lb |
| CONRAD SHIPYARD LLC (DEEPWATER YARD) | MORGAN CITY | Xylene (mixed isomers), n-Butyl alcohol | 48k lb |
| ORION ENGINEERED CARBONS-IVANHOE CARBON BLACK PLANT | FRANKLIN | Ammonia, Hydrogen sulfide | 47k lb |
| BIRLA CARBON USA INC | CENTERVILLE | Hydrogen sulfide, Carbon disulfide | 41k lb |
| CAMERON INTERNATIONAL CORP | BAYOU VISTA | Ethylene glycol, Chromium | 29k lb |
| CAMERON INTERNATIONAL CORP | PATTERSON | Ethylene glycol | 25k lb |
| ENTERPRISE GAS PROCESSING LLC - NEPTUNE GAS PLANT | CENTERVILLE | Benzene, n-Hexane | 6k lb |
| PELICAN PROCESSING PLANT | PATTERSON | n-Hexane, Ethylbenzene | 4k lb |
| NEW INDUSTRIES LLC | MORGAN CITY | Zinc compounds, Copper compounds | 118 lb |
| TWIN BROTHERS MARINE LLC | FRANKLIN | Manganese And Manganese Compounds | 10 lb |
| CONRAD SHIPYARD LLC (MAIN YARD) | MORGAN CITY | Nickel | 10 lb |
| BAKER HUGHES OILFIELD OPERATIONS LLC | MORGAN CITY | Lead And Lead Compounds | 1 lb |
| HALLIBURTON BERWICK BAROID | BERWICK | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 230 tank facilities in St. Mary: 118 tanks in service and 516 closed. 78 fuel releases are on record, of which 11 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps St. Mary as Zone 3, the lowest predicted indoor radon (under 2 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39