Pennington County, SD
The federal environmental record for Pennington County (population 115,903): 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
3
PFAS-detecting water systems
7
TRI facilities
16
open tank releases
Drinking water: PFAS testing
Public water systems serving Pennington 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 |
|---|---|---|
| RAPID VALLEY SANITARY DISTRICT SD4600274 | PFHxS: 5.8 ng/L PFOS: 5.7 ng/L | above final limit |
| NPS-MOUNT RUSHMORE NATIONAL MEMORIAL SD4680046 | PFHxS: 20.8 ng/L PFOS: 10.6 ng/L PFBS: 3.2 ng/L | above final limit |
| RAPID CITY SD4600406 | PFHxS: 5.6 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
7 facilities in Pennington filed TRI reports for 2024, totalling 68k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| GCC DACOTAH | RAPID CITY | Barium, Chromium compounds (except for chromite ore mined in the Transvaal Region) | 36k lb |
| PETE LIEN & SONS INC | RAPID CITY | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Lead compounds | 30k lb |
| MIDWEST MANUFACTURING INC DBA DAKOTA PANEL | RAPID CITY | Formaldehyde, Methanol | 1k lb |
| U.S. DOD USAF, ELLSWORTH AFB | ELLSWORTH AFB | Toluene, Xylene (mixed isomers) | 302 lb |
| FOREST PRODUCTS DISTRIBUTORS INC | RAPID CITY | - | 0 lb |
| HUBBARD FEEDS INC | RAPID CITY | - | 0 lb |
| FORTERRA CONCRETE PRODUCTS - RAPID CITY | RAPID CITY | Lead | 0 lb |
Underground fuel tanks
EPA's UST Finder records 319 tank facilities in Pennington: 295 tanks in service and 682 closed. 376 fuel releases are on record, of which 16 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Pennington as Zone 2, moderate predicted indoor radon (2 to 4 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 Pennington, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- BLACK HILLS PLATINGRAPID CITY
- CHEYENNE RIVER BASINRAPID CITY
- ELLSWORTH AIR FORCE BASEELLSWORTH AFB