LAKE ARROWHEAD CSD
CA · PWS ID CA3610005 · Community water system
111
contaminants tested
27
detected
7,038
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHpA | 0.0057 ug/L | 8/8 | 2024 |
| PFHxA | 0.0067 ug/L | 8/8 | 2024 |
| PFOA | 0.0140 ug/L | 8/8 | 2024 |
| PFOS | 0.0072 ug/L | 8/8 | 2024 |
| PFPeA | 0.0045 ug/L | 8/8 | 2024 |
| PFDA | 0.0039 ug/L | 3/8 | 2024 |
| PFHxS | 0.0033 ug/L | 1/8 | 2024 |
| PFNA | 0.0046 ug/L | 1/8 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Combined Uranium | 223.5 UG/L | 417/1153 | SYR4 | 2012–2019 |
| Bromodichloromethane | 21.3 UG/L | 155/155 | SYR4 | 2012–2019 |
| Chloroform | 58.1 UG/L | 155/155 | SYR4 | 2012–2019 |
| Dibromochloromethane | 29.6 UG/L | 155/155 | SYR4 | 2012–2019 |
| TTHM | 97.6 UG/L | 155/155 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 41 UG/L | 152/152 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 27.8 UG/L | 151/152 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 16.7 UG/L | 146/152 | SYR4 | 2012–2019 |
| Bromoform | 53.1 UG/L | 54/109 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0220 mg/L | 44/44 | LCR | 2023 |
| Dibromoacetic acid | 9.6 UG/L | 42/105 | SYR4 | 2012–2019 |
| Fluoride | 230 UG/L | 29/84 | SYR4 | 2012–2019 |
| Monochloroacetic acid | 3.1 UG/L | 18/98 | SYR4 | 2012–2019 |
| Nitrate | 700 UG/L | 16/168 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 700 UG/L | 8/83 | SYR4 | 2012–2019 |
| Monobromoacetic acid | 1.1 UG/L | 4/96 | SYR4 | 2013–2019 |
| Arsenic | 5.3 UG/L | 1/84 | SYR4 | 2012–2019 |
| Ethylbenzene | 2.5 UG/L | 1/37 | SYR4 | 2012–2019 |
| Xylenes, Total | 16 UG/L | 1/37 | SYR4 | 2012–2019 |
84 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, TotalAsbestosAtrazineBHC-GAMMABariumBenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECOPPER, FREECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneChromiumDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOLeadMercuryMethoxychlorNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBAPFBSPFDoAPFEESAPFHpSPFMBAPFMPAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl chloridecis-1,2-Dichloroethylenelithiumo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene