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ATASCADERO STATE HOSPITAL

PWS ID: CA4010832 · ATASCADERO, California 93423

PFAS Detected

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

Population Served
4,100
Total Violations
6
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
State
Connections
875
County
San Luis Obispo
School/Daycare
No
MCL Violations
0
Monitoring Violations
6
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 4 2015
Nitrate MR 2 2023

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
PFNA 8/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFUnA 8/15/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFOA 8/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 8/15/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/15/2023 <0.004 µg/L 0.004 µg/L Not Detected
11Cl-PF3OUdS 8/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 8/15/2023 0.0043 µg/L 0.004 µg/L Detected
PFHxS 8/15/2023 0.0044 µg/L 0.003 µg/L Detected
PFHpA 8/15/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/15/2023 0.0036 µg/L 0.003 µg/L Detected
NMeFOSAA 8/15/2023 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 8/15/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 8/15/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/15/2023 <0.008 µg/L 0.008 µg/L Not Detected
lithium 8/15/2023 <9 µg/L 9 µg/L Not Detected
9Cl-PF3ONS 8/15/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFDA 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 2/8/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFTA 2/8/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 2/8/2023 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 2/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 2/8/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFBS 2/8/2023 0.0055 µg/L 0.003 µg/L Detected
PFHpA 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 2/8/2023 0.0340 µg/L 0.003 µg/L Detected
PFNA 2/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 2/8/2023 0.0330 µg/L 0.004 µg/L Detected
PFOA 2/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 2/8/2023 0.0036 µg/L 0.003 µg/L Detected
11Cl-PF3OUdS 2/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 2/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 2/8/2023 0.0061 µg/L 0.004 µg/L Detected
NFDHA 2/8/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 2/8/2023 <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.