Greasewood Springs Community Boarding School BIA
PWS ID: NN0436008 · Ganado, Navajo Nation 86505-9706
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
720
Total Violations
216
Health-Based Violations
15
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Federal
- Connections
- 81
- School/Daycare
- Yes
- MCL Violations
- 15
- Monitoring Violations
- 173
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Barium | MCL | 13 | 2013 |
| Coliform (TCR) | MR | 12 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 10 | 2016 |
| TTHM | MR | 8 | 2016 |
| Barium | MR | 7 | 2024 |
| Consumer Confidence Rule | Other | 6 | 2024 |
| 2,3,7,8-TCDD | MR | 6 | 2008 |
| Nitrate | MR | 5 | 2024 |
| Nitrite | MR | 5 | 2024 |
| Fluoride | MR | 4 | 2008 |
| Revised Total Coliform Rule | MON | 4 | 2025 |
| Revised Total Coliform Rule | RPT | 4 | 2025 |
| Revised Total Coliform Rule | Other | 3 | 2016 |
| Public Notice | Other | 3 | 2025 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 3 | 2013 |
| Methoxychlor | MR | 2 | 2004 |
| Toxaphene | MR | 2 | 2004 |
| Dalapon | MR | 2 | 2004 |
| Diquat | MR | 2 | 2004 |
| Endothall | MR | 2 | 2004 |
| OXAMYL | MR | 2 | 2004 |
| Di(2-ethylhexyl) phthalate | MR | 2 | 2004 |
| Hexachlorocyclopentadiene | MR | 2 | 2004 |
| Aldicarb sulfoxide | MR | 2 | 2004 |
| Carbofuran | MR | 2 | 2004 |
| Aldicarb | MR | 2 | 2004 |
| LASSO | MR | 2 | 2004 |
| Heptachlor epoxide | MR | 2 | 2004 |
| Benzo(a)pyrene | MR | 2 | 2004 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2004 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NEtFOSAA | 8/21/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 8/21/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 8/21/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 8/21/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| lithium | 8/21/2023 | 187.0000 µg/L | 9 µg/L | Detected |
| 11Cl-PF3OUdS | 7/31/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 7/31/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 7/31/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 7/31/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/31/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFBS | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 7/31/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFEESA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 7/31/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| ADONA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 7/31/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMPA | 7/31/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 7/31/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 7/31/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 7/31/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 7/31/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 7/31/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTA | 2/21/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 2/21/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 2/21/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 2/21/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| lithium | 2/21/2023 | 160.0000 µg/L | 9 µg/L | Detected |
| PFHxS | 12/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 12/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 12/12/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFNA | 12/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 11Cl-PF3OUdS | 12/12/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpA | 12/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 12/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 12/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 12/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 12/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 12/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 12/12/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 12/12/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFMBA | 12/12/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 12/12/2023 | <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.