St. Charles Parish, LA
The federal environmental record for St. Charles Parish (population 50,620): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
3
federal cleanup sites
1
PFAS-detecting water systems
22
TRI facilities
3
open tank releases
Drinking water: PFAS testing
Public water systems serving St. Charles 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 |
|---|---|---|
| ST CHARLES PARISH DEPT OF WATERWORKS LA1089001 | PFBA: 13.6 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
22 facilities in St. Charles filed TRI reports for 2024, totalling 26.5M lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| BAYER CROPSCIENCE LP | LULING | Formaldehyde, Formic acid | 17.8M lb |
| SHELL NORCO CHEMICAL PLANT | NORCO | Propylene, Ethylene | 5.7M lb |
| VALERO REFINING - NEW ORLEANS LLC | NORCO | Hydrogen cyanide, Ammonia | 671k lb |
| ST CHARLES OPERATIONS (TAFT/STAR) UNION CARBIDE CORP | HAHNVILLE | Ammonia, Ethylene | 663k lb |
| GALATA CHEMICALS LLC - GALATA TAFT FACILITY | HAHNVILLE | Ammonia, Hydrogen sulfide | 572k lb |
| BUNGE CHEVRON AG RENEWABLES LLC | DESTREHAN | n-Hexane | 434k lb |
| OCCIDENTAL CHEMICAL CORP LULING | LULING | Ammonia, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 416k lb |
| LINDE ST CHARLES FACILITY | NORCO | Chromium compounds (except for chromite ore mined in the Transvaal Region), Ammonia | 63k lb |
| RAIN CII CARBON LLC | NORCO | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 57k lb |
| LINDE GAS & EQUIPMENT | HAHNVILLE | N,N-Dimethylformamide, Ethylene | 45k lb |
| DIAMOND GREEN DIESEL LLC | NORCO | Manganese And Manganese Compounds, n-Hexane | 33k lb |
| SHELL NORCO CHEMICAL PLANT WEST SITE | NORCO | Benzene, Toluene | 19k lb |
| HEXION LULING FACILITY | LULING | Methanol, Formaldehyde | 16k lb |
| ENTERPRISE GAS PROC LLC/NORCO FRACTIONATOR | NORCO | n-Hexane, Toluene | 12k lb |
| KOCH FERTILIZER LLC - TAFT TERMINAL | TAFT | Ammonia | 12k lb |
| DISCOVERY PRODUCER SERVICES: PARADIS FRACTIONATOR | PARADIS | n-Hexane, Benzene | 4k lb |
| SHAC CATALYST PLANT | NORCO | Titanium tetrachloride, Chloroethane | 3k lb |
| ARKEMA COATING RESINS | HAHNVILLE | Vinyl acetate, Styrene | 2k lb |
| BARRIERE CONSTRUCTION CO LLC - BOUTTE ASPHALT PLANT | BOUTTE | Polycyclic aromatic compounds | 428 lb |
| AIR PRODUCTS & CHEMICALS INC LULING SMR | LULING | Methanol | 113 lb |
| OCCIDENTAL CHEMICAL CORP | HAHNVILLE | Chlorine, Dioxin and dioxin-like compounds | 99 lb |
| AIR PRODUCTS & CHEMCIALS INC NORCO SMR | NORCO | Methanol | 47 lb |
Underground fuel tanks
EPA's UST Finder records 157 tank facilities in St. Charles: 110 tanks in service and 369 closed. 52 fuel releases are on record, of which 3 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps St. Charles 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 - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for St. Charles, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- DOW ST CHARLES OPERATIONSTAFT
- ST. ROSESAINT ROSE
- ST. ROSE DRUMST. ROSE