THORNTON CITY OF
CO · PWS ID CO0101150 · Community water system
113
contaminants tested
33
detected
226,465
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFBS | 0.0081 ug/L | 7/7 | 2023 |
| PFHxA | 0.0126 ug/L | 7/7 | 2023 |
| PFPeA | 0.0124 ug/L | 7/7 | 2023 |
| PFBA | 0.0104 ug/L | 6/7 | 2023 |
| PFHpA | 0.0037 ug/L | 2/7 | 2023 |
| PFHxS | 0.0059 ug/L | 2/7 | 2023 |
| PFOA | 0.0071 ug/L | 2/7 | 2023 |
| PFOS | 0.0050 ug/L | 2/7 | 2023 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| TTHM | 78.14 UG/L | 766/766 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 44 UG/L | 763/765 | SYR4 | 2012–2019 |
| Bromodichloromethane | 25.4 UG/L | 100/100 | SYR4 | 2012–2019 |
| Chloroform | 27 UG/L | 100/100 | SYR4 | 2012–2019 |
| Dibromochloromethane | 18.8 UG/L | 100/100 | SYR4 | 2012–2019 |
| Bromoform | 7.5 UG/L | 98/100 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 5.64 UG/L | 96/96 | SYR4 | 2016–2019 |
| Dichloroacetic Acid | 16.1 UG/L | 96/96 | SYR4 | 2016–2019 |
| Trichloroacetic Acid | 10 UG/L | 96/96 | SYR4 | 2016–2019 |
| Nitrate | 1160 UG/L | 30/32 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0090 mg/L | 27/27 | LCR | 2025 |
| Barium | 52.5 UG/L | 18/18 | SYR4 | 2012–2019 |
| Bromate | 1.6 UG/L | 17/76 | SYR4 | 2012–2019 |
| Fluoride | 910 UG/L | 16/16 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 1200 UG/L | 13/14 | SYR4 | 2013–2019 |
| Combined Uranium | 7.4 UG/L | 12/14 | SYR4 | 2012–2018 |
| Chromium | 1.8 UG/L | 8/18 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon and U | 2.7 PCI/L | 7/13 | SYR4 | 2012–2018 |
| lithium | 34 ug/L | 7/7 | UCMR-5 | 2023 |
| Monobromoacetic acid | 1.1 UG/L | 6/96 | SYR4 | 2016–2019 |
| Gross Beta Particle Activity | 5.86 PCI/L | 5/7 | SYR4 | 2014–2017 |
| Combined Radium (-226 and -228) | 0.8300 PCI/L | 4/13 | SYR4 | 2012–2018 |
| Nitrite | 650 UG/L | 3/14 | SYR4 | 2013–2019 |
| Antimony, Total | 0.2700 UG/L | 2/18 | SYR4 | 2012–2019 |
| Arsenic | 0.9300 UG/L | 2/18 | SYR4 | 2012–2019 |
80 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-PF3ONSADONAAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECOPPER, FREECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOMercuryMethoxychlorMonochloroacetic acidNEtFOSAANFDHANMeFOSAAOXAMYLPFDAPFDoAPFEESAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene