CASTLE ROCK TOWN OF
CO · PWS ID CO0118010 · Community water system
111
contaminants tested
30
detected
110,298
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFPeA | 0.0047 ug/L | 2/12 | 2024 |
| PFBA | 0.0051 ug/L | 1/12 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 67.49 UG/L | 208/210 | SYR4 | 2012–2019 |
| Chloroform | 5.3 UG/L | 111/113 | SYR4 | 2015–2019 |
| Bromodichloromethane | 9.3 UG/L | 96/113 | SYR4 | 2015–2019 |
| Total Haloacetic Acids (HAA5) | 9.3 UG/L | 74/210 | SYR4 | 2012–2019 |
| Dibromochloromethane | 14.1 UG/L | 68/113 | SYR4 | 2015–2019 |
| Nitrate | 350 UG/L | 62/110 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 4.5 UG/L | 45/112 | SYR4 | 2016–2019 |
| Bromoform | 7.49 UG/L | 41/113 | SYR4 | 2015–2019 |
| Barium | 520 UG/L | 37/37 | SYR4 | 2012–2019 |
| Fluoride | 1100 UG/L | 37/37 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0060 mg/L | 33/33 | LCR | 2025 |
| Combined Radium (-226 and -228) | 5.2 PCI/L | 29/29 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 4.6 UG/L | 29/112 | SYR4 | 2016–2019 |
| Gross Alpha, Excl. Radon and U | 7.63 PCI/L | 25/28 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 350 UG/L | 17/26 | SYR4 | 2012–2019 |
| lithium | 25 ug/L | 11/12 | UCMR-5 | 2024 |
| Monobromoacetic acid | 2.2 UG/L | 9/112 | SYR4 | 2016–2019 |
| Combined Uranium | 3 UG/L | 8/29 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 7 PCI/L | 8/12 | SYR4 | 2012–2018 |
| Chromium | 3 UG/L | 7/37 | SYR4 | 2012–2019 |
| Selenium | 5 UG/L | 6/37 | SYR4 | 2012–2019 |
| Xylenes, Total | 27.5 UG/L | 2/56 | SYR4 | 2012–2019 |
| Arsenic | 1.9 UG/L | 1/37 | SYR4 | 2012–2019 |
| Di(2-ethylhexyl) phthalate | 1.9 UG/L | 1/49 | SYR4 | 2012–2019 |
| Ethylbenzene | 2.3 UG/L | 1/56 | SYR4 | 2012–2019 |
| Picloram | 0.1000 UG/L | 1/48 | SYR4 | 2012–2019 |
| Thallium, Total | 2 UG/L | 1/37 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 1.3 UG/L | 1/113 | SYR4 | 2014–2019 |
81 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorMonochloroacetic acidNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFHxAPFHxSPFMBAPFMPAPFNAPFOAPFOSPFPeSPFTAPFTrDAPFUnAPentachlorophenolSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chloridecis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene