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States → California

UKIAH, CITY OF

PWS ID: CA2310003 · UKIAH, California 95482

PFAS Detected

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

Population Served
16,607
Total Violations
4
Health-Based Violations
2
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
4,935
County
Mendocino
School/Daycare
No
MCL Violations
2
Monitoring Violations
1
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 2 1996
Lead and Copper Rule MR 1 2022

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 19 of 480 samples detected PFAS.

Contaminant Date Result MRL Status
PFHxS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/1/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFOS 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 8/1/2024 <0.02 µg/L 0.02 µg/L Not Detected
11Cl-PF3OUdS 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/1/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
ADONA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/1/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/1/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/1/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/1/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/1/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/1/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/1/2024 <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.