Dry Creek Rancheria
PWS ID: 090600127 · Geyserville, 09 95441
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
2,200
Total Violations
122
Health-Based Violations
4
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Native American
- Connections
- 3
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 44
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 11 | 2014 |
| Nitrate | MR | 4 | 2013 |
| Coliform (TCR) | MCL | 4 | 2011 |
| Consumer Confidence Rule | Other | 3 | 2002 |
| Xylenes, Total | MR | 2 | 2021 |
| Lead and Copper Rule | MR | 2 | 1996 |
| Arsenic | MR | 1 | 2001 |
| Cadmium | MR | 1 | 2001 |
| CYANIDE | MR | 1 | 1998 |
| Fluoride | MR | 1 | 2001 |
| Mercury | MR | 1 | 2001 |
| Selenium | MR | 1 | 2001 |
| Antimony, Total | MR | 1 | 2001 |
| Beryllium, Total | MR | 1 | 2001 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2017 |
| Pentachlorophenol | MR | 1 | 2017 |
| 2,4-D | MR | 1 | 2017 |
| Benzo(a)pyrene | MR | 1 | 2017 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 1996 |
| Chlorine | MR | 1 | 2025 |
| Revised Total Coliform Rule | MON | 1 | 2018 |
| Public Notice | Other | 1 | 2018 |
| Picloram | MR | 1 | 2017 |
| Methoxychlor | MR | 1 | 2017 |
| Dinoseb | MR | 1 | 2017 |
| E. COLI | MR | 1 | 2019 |
| Barium | MR | 1 | 2001 |
| 2,4,5-TP | MR | 1 | 2017 |
| Dalapon | MR | 1 | 2017 |
| Chromium | MR | 1 | 2001 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFUnA | 7/22/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 7/22/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFOA | 7/22/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 7/22/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDoA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 7/22/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTrDA | 7/22/2025 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 7/22/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFNA | 7/22/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMPA | 7/22/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NMeFOSAA | 7/22/2025 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/22/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxS | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 7/22/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 7/22/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 7/22/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 7/22/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 7/22/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 7/22/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| lithium | 7/22/2025 | 11.8000 µg/L | 9 µg/L | Detected |
| PFMBA | 7/22/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 1/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 1/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 1/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 1/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 1/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 1/6/2025 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 1/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 1/6/2025 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| lithium | 1/6/2025 | 16.4000 µg/L | 9 µg/L | Detected |
| PFOA | 1/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 1/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 1/6/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NFDHA | 1/6/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| 8:2 FTS | 1/6/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDA | 1/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 1/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFEESA | 1/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 1/6/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 1/6/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 4:2 FTS | 1/6/2025 | <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.