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States → California

CITY OF PASO ROBLES WATER DIVISION

PWS ID: CA4010007 · PASO ROBLES, California 93446

PFAS Detected

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

Population Served
31,176
Total Violations
9
Health-Based Violations
2
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
10,822
County
San Luis Obispo
School/Daycare
No
MCL Violations
0
Monitoring Violations
5
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule TT 2 1993
E. COLI MR 2 2015
Coliform (TCR) MR 2 2008
Lead and Copper Rule MR 1 1993

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 38 of 690 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/5/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 6/5/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 6/5/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 6/5/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHxS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 6/5/2025 <0.006 µg/L 0.006 µg/L Not Detected
lithium 6/5/2025 43.3000 µg/L 9 µg/L Detected
PFTA 6/5/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFOS 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 6/5/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFMPA 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 6/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 6/5/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFEESA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 6/5/2025 <0.005 µg/L 0.005 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.