RAPID VALLEY SANITARY DISTRICT
SD · PWS ID SD4600274 · Community water system
50
contaminants tested
10
detected
11,408
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHxS | 0.0058 ug/L | 4/4 | 2024 |
| PFOS | 0.0057 ug/L | 1/4 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| COPPER, FREE | 445 UG/L | 60/60 | SYR4 | 2012–2018 |
| Lead | 27 UG/L | 60/60 | SYR4 | 2012–2018 |
| TTHM | 102 UG/L | 58/58 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 64.4 UG/L | 53/58 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0070 mg/L | 15/15 | LCR | 2024 |
| Nitrate | 892 UG/L | 2/6 | SYR4 | 2017–2019 |
| lithium | 23.4 ug/L | 2/4 | UCMR-5 | 2024 |
| Gross Alpha, Excl. Radon and U | 0.8000 PCI/L | 1/1 | SYR4 | 2012 |
40 contaminants tested, none detected
11Cl-PF3OUdS4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalArsenicBariumBeryllium, TotalCadmiumChromiumCombined Radium (-226 and -228)Combined UraniumGross Beta Particle ActivityHFPO-DAMercuryNEtFOSAANFDHANMeFOSAANitritePFBAPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFMBAPFMPAPFNAPFOAPFPeAPFPeSPFTAPFTrDAPFUnASeleniumThallium, Total
Areas served
RAPID CITY