De Soto Parish, LA
The federal environmental record for De Soto Parish (population 27,114): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
1
federal cleanup sites
2
PFAS-detecting water systems
2
TRI facilities
5
open tank releases
Drinking water: PFAS testing
Public water systems serving De Soto 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 |
|---|---|---|
| MANSFIELD WATER SYSTEM LA1031009 | PFPeA: 3.5 ng/L | detected |
| DESOTO PARISH WATER WORKS DISTRICT 1 LA1031030 | PFPeA: 3.7 ng/L PFHxA: 3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
2 facilities in De Soto filed TRI reports for 2024, totalling 4.3M lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| INTERNATIONAL PAPER CO - MANSFIELD MILL | MANSFIELD | Methanol, Zinc compounds | 4.1M lb |
| NORTH LOUISIANA GAS PLANT | FRIERSON | Toluene, Benzene | 191k lb |
Underground fuel tanks
EPA's UST Finder records 120 tank facilities in De Soto: 50 tanks in service and 290 closed. 37 fuel releases are on record, of which 5 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps De Soto 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 De Soto, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
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