MODESTO, CITY OF
CA · PWS ID CA5010010 · Community water system
114
contaminants tested
35
detected
218,771
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFOS | 0.0260 ug/L | 15/86 | 2024 |
| PFHxS | 0.0093 ug/L | 13/86 | 2024 |
| PFHxA | 0.0061 ug/L | 8/86 | 2024 |
| PFOA | 0.0086 ug/L | 8/86 | 2024 |
| PFPeA | 0.0067 ug/L | 8/86 | 2024 |
| PFBS | 0.0043 ug/L | 2/86 | 2024 |
| PFHpA | 0.0036 ug/L | 1/86 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 21000 UG/L | 12032/12254 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 16000 UG/L | 5231/5297 | SYR4 | 2012–2018 |
| Combined Uranium | 71.52 UG/L | 2492/2649 | SYR4 | 2012–2019 |
| Arsenic | 12 UG/L | 630/1638 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.7000 UG/L | 576/1233 | SYR4 | 2012–2019 |
| TTHM | 98.16 UG/L | 276/449 | SYR4 | 2012–2019 |
| Chloroform | 94.45 UG/L | 252/450 | SYR4 | 2012–2019 |
| Trichloroethylene | 54 UG/L | 239/573 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 61.1 UG/L | 236/249 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 32.9 UG/L | 232/247 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 32.2 UG/L | 232/247 | SYR4 | 2012–2019 |
| Bromodichloromethane | 13.8 UG/L | 224/463 | SYR4 | 2012–2019 |
| Nitrite | 0.9500 UG/L | 170/5319 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 22 UG/L | 121/573 | SYR4 | 2012–2019 |
| Dibromochloromethane | 9.92 UG/L | 120/405 | SYR4 | 2012–2019 |
| Barium | 310 UG/L | 97/177 | SYR4 | 2012–2019 |
| Bromoform | 6.67 UG/L | 78/392 | SYR4 | 2012–2019 |
| Fluoride | 1200 UG/L | 59/177 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 2.9 UG/L | 33/162 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0120 mg/L | 31/31 | LCR | 2027 |
| Monochloroacetic acid | 5.3 UG/L | 23/167 | SYR4 | 2012–2019 |
| lithium | 21 ug/L | 13/86 | UCMR-5 | 2024 |
| 1,1-Dichloroethylene | 0.9900 UG/L | 11/572 | SYR4 | 2012–2019 |
| Selenium | 6.2 UG/L | 3/177 | SYR4 | 2012–2019 |
| Combined Radium (-226 and -228) | 1.19 PCI/L | 2/2 | SYR4 | 2013–2015 |
| Gross Beta Particle Activity | 3.67 PCI/L | 2/2 | SYR4 | 2015–2017 |
| Chromium | 6.4 UG/L | 1/177 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 2 UG/L | 1/158 | SYR4 | 2012–2019 |
79 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalAsbestosAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECOPPER, FREECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneChloriteDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOLeadMercuryMethoxychlorNEtFOSAANFDHANMeFOSAAOXAMYLPFBAPFDAPFDoAPFEESAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene
Areas served
MODESTO