GSWC - CLAREMONT

CA · PWS ID CA1910024 · Community water system

44
contaminants tested
19
detected
39,730
people served
Water source
SWP
Ownership
Private
Counties served
Los Angeles

PFAS detected

“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
ContaminantMaxDetection ratePeriod
PFHxA 0.0084 ug/L 8/26 2024
PFPeA 0.0064 ug/L 8/26 2024
PFBS 0.0051 ug/L 5/26 2024
PFOA 0.0129 ug/L 5/26 2024
PFHpA 0.0046 ug/L 4/26 2024
PFHxS 0.0037 ug/L 3/26 2024
PFOS 0.0104 ug/L 1/26 2024

Other contaminants detected

ContaminantMaxDetection rateSourcePeriod
TTHM 68 UG/L 261/473 SYR4 2012–2019
Chloroform 27 UG/L 251/477 SYR4 2012–2019
Bromodichloromethane 21 UG/L 140/459 SYR4 2012–2019
Dibromochloromethane 29 UG/L 140/460 SYR4 2012–2019
Total Haloacetic Acids (HAA5) 38 UG/L 125/128 SYR4 2012–2019
Dichloroacetic Acid 16 UG/L 119/128 SYR4 2012–2019
Dibromoacetic acid 8.3 UG/L 116/128 SYR4 2012–2019
Bromoform 13 UG/L 115/460 SYR4 2012–2019
Trichloroacetic Acid 12 UG/L 106/128 SYR4 2012–2019
Monobromoacetic acid 6.2 UG/L 42/128 SYR4 2012–2019
LEAD SUMMARY 0.0057 mg/L 38/38 LCR 2026
Monochloroacetic acid 5.7 UG/L 36/128 SYR4 2012–2019
25 contaminants tested, none detected
11Cl-PF3OUdS4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONACOPPER, FREEHFPO-DALeadNEtFOSAANFDHANMeFOSAAPFBAPFDAPFDoAPFEESAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnAlithium

Utility contact

Contact
ZAKHARI, GEORGE
Phone
760-515-8322
Email
George.Zakhari@gswater.com