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States → 09

Viejas Community System

PWS ID: 090600158 · Alpine, 09 91901

PFAS Detected

2 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
9,600
Total Violations
181
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
230
School/Daycare
No
MCL Violations
3
Monitoring Violations
138
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 17 2007
Nitrate MR 4 2007
CYANIDE MR 3 2005
ETHYLENE DIBROMIDE MR 3 2004
Coliform (TCR) MCL 3 2008
Lead and Copper Rule MR 3 2005
Arsenic MR 2 2005
Chromium MR 2 2005
Cadmium MR 2 2005
Fluoride MR 2 2005
Mercury MR 2 2005
Selenium MR 2 2005
Beryllium, Total MR 2 2005
Asbestos MR 2 1998
Endrin MR 2 1998
BHC-GAMMA MR 2 1998
Toxaphene MR 2 1998
Atrazine MR 2 1998
Heptachlor MR 2 1998
Heptachlor epoxide MR 2 1998
2,4-D MR 2 1998
2,4,5-TP MR 2 1998
Pentachlorophenol MR 2 1998
cis-1,2-Dichloroethylene MR 2 2004
Total Polychlorinated Biphenyls (PCB) MR 2 1998
1,2-DIBROMO-3-CHLOROPROPANE MR 2 1998
Xylenes, Total MR 2 2004
Chlordane MR 2 1998
o-Dichlorobenzene MR 2 2004
p-Dichlorobenzene MR 2 2004

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFBS 6/4/2024 0.0243 µg/L 0.003 µg/L Detected
PFOA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 6/4/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 6/4/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 6/4/2024 <0.008 µg/L 0.008 µg/L Not Detected
lithium 6/4/2024 21.4000 µg/L 9 µg/L Detected
PFHpS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/4/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMPA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/4/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/4/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/4/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFBA 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 6/4/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 6/4/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/4/2024 <0.003 µg/L 0.003 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.