GRAND CANYON NATIONAL PARK
PWS ID: AZ0403702 · GRAND CANYON, Arizona 86023
Population Served
16,590
Total Violations
424
Health-Based Violations
26
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Federal
- Connections
- 630
- County
- Coconino
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 342
- Treatment Tech Violations
- 17
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 39 | 2025 |
| Mercury | MR | 22 | 2009 |
| Nitrate | MR | 19 | 2005 |
| Groundwater Rule | TT | 13 | 2022 |
| Coliform (TCR) | MR | 12 | 2006 |
| TTHM | MR | 10 | 2023 |
| Total Haloacetic Acids (HAA5) | MR | 10 | 2023 |
| Revised Total Coliform Rule | MON | 9 | 2024 |
| Arsenic | MR | 8 | 2009 |
| Cadmium | MR | 8 | 2009 |
| Selenium | MR | 8 | 2009 |
| Consumer Confidence Rule | Other | 8 | 2025 |
| Chromium | MR | 8 | 2009 |
| Barium | MR | 8 | 2009 |
| Fluoride | MR | 7 | 2009 |
| Antimony, Total | MR | 7 | 2009 |
| CYANIDE | MR | 7 | 2009 |
| Beryllium, Total | MR | 7 | 2009 |
| Thallium, Total | MR | 7 | 2009 |
| cis-1,2-Dichloroethylene | MR | 5 | 2025 |
| DICHLOROMETHANE | MR | 5 | 2025 |
| o-Dichlorobenzene | MR | 5 | 2025 |
| 1,1-Dichloroethylene | MR | 5 | 2025 |
| trans-1,2-Dichloroethylene | MR | 5 | 2025 |
| 1,1,1-Trichloroethane | MR | 5 | 2025 |
| 1,2-Dichloropropane | MR | 5 | 2025 |
| Trichloroethylene | MR | 5 | 2025 |
| 1,1,2-Trichloroethane | MR | 5 | 2025 |
| CHLOROBENZENE | MR | 5 | 2025 |
| Benzene | MR | 5 | 2025 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 30 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| HFPO-DA | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFEESA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 7/29/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 7/29/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| ADONA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 8:2 FTS | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/29/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFTA | 7/29/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFOS | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 7/29/2024 | <9 µg/L | 9 µg/L | Not Detected |
| PFTrDA | 7/29/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 7/29/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 7/29/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFOA | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDoA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 7/29/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 7/29/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 7/29/2024 | <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.