RAPID CITY
SD · PWS ID SD4600406 · Community water system
50
contaminants tested
12
detected
72,009
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHxS | 0.0056 ug/L | 2/20 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 45 UG/L | 124/128 | SYR4 | 2012–2019 |
| COPPER, FREE | 343 UG/L | 90/90 | SYR4 | 2012–2018 |
| Lead | 7 UG/L | 90/90 | SYR4 | 2012–2018 |
| Total Haloacetic Acids (HAA5) | 24 UG/L | 52/127 | SYR4 | 2012–2019 |
| Nitrate | 1710 UG/L | 34/56 | SYR4 | 2013–2019 |
| LEAD SUMMARY | 0.0060 mg/L | 15/15 | LCR | 2024 |
| Barium | 140 UG/L | 12/12 | SYR4 | 2012–2019 |
| Arsenic | 6 UG/L | 4/13 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon and U | 7.32 PCI/L | 4/13 | SYR4 | 2012–2018 |
| Gross Beta Particle Activity | 3.5 PCI/L | 1/13 | SYR4 | 2012–2018 |
| Nitrite | 200 UG/L | 1/12 | SYR4 | 2012–2018 |
38 contaminants tested, none detected
11Cl-PF3OUdS4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalBeryllium, TotalCadmiumChromiumCombined Radium (-226 and -228)Combined UraniumHFPO-DAMercuryNEtFOSAANFDHANMeFOSAAPFBAPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFMBAPFMPAPFNAPFOAPFOSPFPeAPFPeSPFTAPFTrDAPFUnASeleniumThallium, Totallithium
Areas served
RAPID CITY