Ascension Parish, LA
The federal environmental record for Ascension Parish (population 131,632): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
3
Superfund NPL sites
6
federal cleanup sites
1
PFAS-detecting water systems
26
TRI facilities
7
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Cleve Reber | Sorrento | deleted | 09/08/1983 |
| Dutchtown Treatment Plant | Ascension Parish | deleted | 07/22/1987 |
| Old Inger Oil Refinery | Darrow | deleted | 09/08/1983 |
Drinking water: PFAS testing
Public water systems serving Ascension 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 |
|---|---|---|
| PARISH UTILITIES OF ASCENSION LA1005035 | PFBA: 6.7 ng/L PFBS: 4.7 ng/L PFOS: 4.5 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
26 facilities in Ascension filed TRI reports for 2024, totalling 23.4M lb released. The 25 largest by volume:
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| CF INDUSTRIES NITROGEN LLC | DONALDSONVILLE | Ammonia, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 9.2M lb |
| RUBICON LLC | GEISMAR | Aniline, Sodium nitrite | 7.1M lb |
| BASF CORP | GEISMAR | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Ammonia | 1.6M lb |
| PCS NITROGEN FERTILIZER LP | GEISMAR | Ammonia, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 1.5M lb |
| METHANEX USA SERVICES LLC | GEISMAR | Ammonia, Methanol | 1.4M lb |
| LION COPOLYMER GEISMAR LLC | GEISMAR | n-Hexane, Propylene | 1.0M lb |
| HONEYWELL INTERNATIONAL INC GEISMAR PLANT | CARVILLE | Arsenic, Hydrogen fluoride | 347k lb |
| SHELL CHEMICAL LP | GEISMAR | Ethylene, Ammonia | 310k lb |
| OCCIDENTAL CHEMICAL HOLDING CORP - GEISMAR PLANT | GEISMAR | Zinc compounds, Methanol | 206k lb |
| WESTLAKE VINYLS CO | GEISMAR | 1,2-Dichloroethane, Chloroform | 169k lb |
| INNOPHOS INC | GEISMAR | Chromium, Vanadium (except when contained in an alloy) | 133k lb |
| NOVA CHEMICALS OLEFINS LLC | GEISMAR | Ethylene, Propylene | 129k lb |
| GEISMAR FRACTINATION PLANT | GEISMAR | Propylene, Ethylene | 68k lb |
| HEXION INC | GEISMAR | Methanol, Formaldehyde | 58k lb |
| LINDE GEISMAR FACILITY | GEISMAR | Methanol, Ammonia | 55k lb |
| RIVERSIDE FRACTIONATION PLANT | GEISMAR | n-Hexane, Propylene | 11k lb |
| NEXPERA BURNSIDE FACILITY | DARROW | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Hydrogen sulfide | 9k lb |
| BASF NORTH GEISMAR SITE | GEISMAR | Toluene, Hydrogen cyanide | 9k lb |
| TEBONE FRACTIONATION PLANT | GEISMAR | n-Hexane, Benzene | 3k lb |
| REG GEISMAR LLC | GEISMAR | n-Hexane | 2k lb |
| GEISMAR FABRICATION FACILITY | GEISMAR | Nickel, Chromium | 132 lb |
| UNIVAR SOLUTIONS GEISMAR GE | GEISMAR | Certain glycol ethers | 28 lb |
| SUN COAST RESOURCES LLC | DONALDSONVILLE | Polycyclic aromatic compounds | 0 lb |
| AIRGAS USA LLC | GEISMAR | - | 0 lb |
| MULTI-CHEM GROUP GEISMAR LA FACILITY | GEISMAR | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 292 tank facilities in Ascension: 216 tanks in service and 597 closed. 106 fuel releases are on record, of which 7 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Ascension 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 Ascension, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- CLEVE REBERSORRENTO
- DUTCHTOWN TREATMENT PLANTASCENSION PARISH
- GONZALES HM & BAILEY PROPERTYGONZALES
- OLD INGER OIL REFINERYDARROW
- WESTLAKE VINYLS CO LP - GEISMAR FACILITYGEISMAR
- WILLIAMS OLEFIN GEISMAR EXPLOSIONGEISMAR