GREAT OAKS WC INC
CA · PWS ID CA4310022 · Community water system
112
contaminants tested
20
detected
110,088
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHxA | 0.0045 ug/L | 5/37 | 2025 |
| PFHxS | 0.0080 ug/L | 5/37 | 2025 |
| PFPeA | 0.0047 ug/L | 5/37 | 2025 |
| PFOS | 0.0046 ug/L | 1/37 | 2025 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 7600 UG/L | 310/310 | SYR4 | 2012–2019 |
| Fluoride | 260 UG/L | 52/52 | SYR4 | 2013–2019 |
| Nitrate-Nitrite | 1000000 UG/L | 49/49 | SYR4 | 2013–2019 |
| Barium | 180 UG/L | 37/53 | SYR4 | 2013–2019 |
| lithium | 16 ug/L | 34/38 | UCMR-5 | 2025 |
| LEAD SUMMARY | 0.0160 mg/L | 31/31 | LCR | 2023 |
| 1,1,1-Trichloroethane | 1.7 UG/L | 16/69 | SYR4 | 2012–2019 |
| Bromoform | 8.8 UG/L | 5/12 | SYR4 | 2013–2019 |
| TTHM | 13 UG/L | 5/12 | SYR4 | 2013–2019 |
| Dibromoacetic acid | 2.1 UG/L | 4/5 | SYR4 | 2016–2019 |
| Dibromochloromethane | 4.1 UG/L | 4/12 | SYR4 | 2013–2019 |
| Total Haloacetic Acids (HAA5) | 2.1 UG/L | 2/5 | SYR4 | 2016–2019 |
| Asbestos | 0.1900 MFL | 1/22 | SYR4 | 2014–2019 |
| Bromodichloromethane | 1.1 UG/L | 1/12 | SYR4 | 2013–2019 |
| Gross Beta Particle Activity | 4.7 PCI/L | 1/2 | SYR4 | 2016 |
| Mercury | 1.9 UG/L | 1/52 | SYR4 | 2013–2019 |
92 contaminants tested, none detected
1,1,2-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, TotalArsenicAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCHLOROBENZENECOPPER, FREECYANIDECadmiumCarbofuranCarbon tetrachlorideChlordaneChloroformChromiumCombined UraniumDICHLOROMETHANEDalaponDi(2-ethylhexyl) adipateDi(2-ethylhexyl) phthalateDichloroacetic AcidDinosebDiquatETHYLENE DIBROMIDEEndothallEndrinEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHeptachlor epoxideHexachlorocyclopentadieneLASSOLeadMethoxychlorMonobromoacetic acidMonochloroacetic acidNEtFOSAANFDHANMeFOSAANitriteOXAMYLPFBAPFBSPFDAPFDoAPFEESAPFHpAPFHpSPFMBAPFMPAPFNAPFOAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl chlorideXylenes, Totalcis-1,2-Dichloroethyleneo-Dichlorobenzenep-Dichlorobenzenetrans-1,2-Dichloroethylene