CITY OF ARROYO GRANDE UTILITIES DIVISION
PWS ID: CA4010001 · ARROYO GRANDE, California 93420
PFAS Detected
7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
17,963
Total Violations
7
Health-Based Violations
2
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 6,854
- County
- San Luis Obispo
- School/Daycare
- No
- MCL Violations
- 2
- Monitoring Violations
- 3
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 2 | 2012 |
| TTHM | MCL | 2 | 1996 |
| Revised Total Coliform Rule | MON | 1 | 2025 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 29 of 240 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 11Cl-PF3OUdS | 9/10/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 9/10/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 9/10/2024 | 0.0033 µg/L | 0.003 µg/L | Detected |
| PFDoA | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 9/10/2024 | 0.0046 µg/L | 0.004 µg/L | Detected |
| PFNA | 9/10/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 9/10/2024 | 0.0043 µg/L | 0.003 µg/L | Detected |
| PFBS | 9/10/2024 | 0.0110 µg/L | 0.003 µg/L | Detected |
| 9Cl-PF3ONS | 9/10/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFDA | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 9/10/2024 | 14.0000 µg/L | 9 µg/L | Detected |
| PFHpA | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 9/10/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| NEtFOSAA | 9/10/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 9/10/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFOS | 9/10/2024 | 0.0056 µg/L | 0.004 µg/L | Detected |
| ADONA | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 9/10/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFPeS | 9/10/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFTrDA | 9/10/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFEESA | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 4:2 FTS | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 9/10/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 9/10/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 9/10/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 9/10/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFPeA | 9/10/2024 | 0.0033 µg/L | 0.003 µg/L | Detected |
| 6:2 FTS | 9/10/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 9/10/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 6/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 6/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 6/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NFDHA | 6/19/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFOS | 6/19/2024 | 0.0068 µg/L | 0.004 µg/L | Detected |
| PFEESA | 6/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 6/19/2024 | 0.0110 µg/L | 0.003 µg/L | Detected |
| PFHxS | 6/19/2024 | 0.0055 µg/L | 0.003 µg/L | Detected |
| PFOA | 6/19/2024 | 0.0058 µg/L | 0.004 µg/L | Detected |
| PFHxA | 6/19/2024 | 0.0035 µg/L | 0.003 µg/L | Detected |
| PFUnA | 6/19/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 9Cl-PF3ONS | 6/19/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 6/19/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 6/19/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 6/19/2024 | 13.6000 µg/L | 9 µg/L | Detected |
| PFPeA | 6/19/2024 | 0.0041 µg/L | 0.003 µg/L | Detected |
| PFTA | 6/19/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NMeFOSAA | 6/19/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 6/19/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFPeS | 6/19/2024 | <0.004 µg/L | 0.004 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.