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States → California

CITY OF GRIDLEY

PWS ID: CA0410004 · GRIDLEY, California 95948

PFAS Detected

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

Population Served
7,269
Total Violations
11
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,282
County
Butte
School/Daycare
No
MCL Violations
6
Monitoring Violations
2
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 4 2008
Nitrate MR 2 2002
Coliform (TCR) MCL 2 1999
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 12 of 300 samples detected PFAS.

Contaminant Date Result MRL Status
ADONA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 6/3/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 6/3/2024 <0.008 µg/L 0.008 µg/L Not Detected
lithium 6/3/2024 <9 µg/L 9 µg/L Not Detected
PFHpS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/3/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 6/3/2024 <0.006 µg/L 0.006 µg/L Not Detected
HFPO-DA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/3/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/3/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 6/3/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 6/3/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 6/3/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFHpS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/3/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 6/3/2024 0.0065 µg/L 0.003 µg/L Detected
PFMPA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 6/3/2024 0.0105 µg/L 0.004 µg/L Detected
HFPO-DA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/3/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/3/2024 <0.002 µg/L 0.002 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.