PlainWater
States → California

ROHNERT PARK, CITY OF

PWS ID: CA4910014 · ROHNERT PARK, California 94928

PFAS Detected

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

Population Served
43,821
Total Violations
561
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
10,427
County
Sonoma
School/Daycare
No
MCL Violations
4
Monitoring Violations
552
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
p-Dichlorobenzene MR 26 2017
Vinyl chloride MR 26 2017
1,1-Dichloroethylene MR 26 2017
trans-1,2-Dichloroethylene MR 26 2017
1,2-Dichloroethane MR 26 2017
1,1,1-Trichloroethane MR 26 2017
1,2-Dichloropropane MR 26 2017
1,1,2-Trichloroethane MR 26 2017
Tetrachloroethylene MR 26 2017
Benzene MR 26 2017
Toluene MR 26 2017
1,2,4-Trichlorobenzene MR 26 2017
cis-1,2-Dichloroethylene MR 26 2017
DICHLOROMETHANE MR 26 2017
o-Dichlorobenzene MR 26 2017
Carbon tetrachloride MR 26 2017
Ethylbenzene MR 26 2017
Styrene MR 26 2017
Xylenes, Total MR 26 2017
Trichloroethylene MR 26 2017
CHLOROBENZENE MR 26 2017
Coliform (TCR) MCL 4 2011
Revised Total Coliform Rule MON 2 2021
Arsenic MR 2 2021
Nitrate MR 2 2017

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 17 of 480 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 5/21/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/21/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 5/21/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 5/21/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 5/21/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 5/21/2024 <0.004 µg/L 0.004 µg/L Not Detected
6:2 FTS 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 5/21/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 5/21/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFBA 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 5/21/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 5/21/2024 <0.008 µg/L 0.008 µg/L Not Detected
NFDHA 5/21/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFTA 5/21/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 5/21/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 5/21/2024 <0.006 µg/L 0.006 µg/L Not Detected
8:2 FTS 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 5/21/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFOA 5/21/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 5/21/2024 0.0036 µg/L 0.003 µg/L Detected
PFOS 5/21/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 5/21/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 5/21/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 5/21/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 5/21/2024 <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.