NPS-MOUNT RUSHMORE NATIONAL MEMORIAL
PWSID: SD4680046 · KEYSTONE, SD · Serving 4,100 people
Type: NTNCWSOwner: FSource: GW
Settlement eligible
Settlement details
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Upgrade to ProExceeds MCL
One or more PFAS compounds exceed EPA Maximum Contaminant Levels. Corrective action required by 2031.
Key contaminants vs MCL
EPA MCL: 4 ppt (parts per trillion) for PFOA and PFOS individually. Compliance deadline: 2031-12-31
Exact contamination levels
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Upgrade to ProDetection summary
33.7 ppt
Highest single detection
2023-06-14
Latest sample date
All PFAS detection results
Source: EPA UCMR5 (UCMR5) · 58 compounds tested
| Contaminant | Result (ppt) | MCL (ppt) | Status | Sample date |
|---|
| PFBA | ND | — | Below MRL | 2023-11-07 |
| 8:2 FTS | ND | — | Below MRL | 2023-06-14 |
| PFPeS | ND | — | Below MRL | 2023-11-07 |
| PFHpS | ND | — | Below MRL | 2023-11-07 |
| PFTA | ND | — | Below MRL | 2023-11-07 |