NOGALES CITY OF
PWS ID: AZ0412004 · NOGALES, Arizona 85621
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
22,000
Total Violations
1,954
Health-Based Violations
36
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 5,400
- County
- Santa Cruz
- School/Daycare
- No
- MCL Violations
- 25
- Monitoring Violations
- 1,860
- Treatment Tech Violations
- 11
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MR | 98 | 2024 |
| Nitrate | MR | 82 | 2023 |
| TTHM | MR | 55 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 55 | 2024 |
| Chlorine | MR | 39 | 2025 |
| 2,4-D | MR | 34 | 2018 |
| Coliform (TCR) | MR | 33 | 2016 |
| Pentachlorophenol | MR | 32 | 2018 |
| Di(2-ethylhexyl) adipate | MR | 31 | 2018 |
| Simazine | MR | 31 | 2018 |
| Di(2-ethylhexyl) phthalate | MR | 31 | 2018 |
| Picloram | MR | 31 | 2018 |
| Dinoseb | MR | 31 | 2018 |
| Hexachlorocyclopentadiene | MR | 31 | 2018 |
| Carbofuran | MR | 31 | 2018 |
| Atrazine | MR | 31 | 2018 |
| LASSO | MR | 31 | 2018 |
| 2,3,7,8-TCDD | MR | 31 | 2018 |
| Heptachlor | MR | 31 | 2018 |
| Heptachlor epoxide | MR | 31 | 2018 |
| 2,4,5-TP | MR | 31 | 2018 |
| HEXACHLOROBENZENE | MR | 31 | 2018 |
| Benzo(a)pyrene | MR | 31 | 2018 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 31 | 2018 |
| ETHYLENE DIBROMIDE | MR | 31 | 2018 |
| Chlordane | MR | 31 | 2018 |
| Methoxychlor | MR | 31 | 2018 |
| Endrin | MR | 31 | 2018 |
| BHC-GAMMA | MR | 31 | 2018 |
| Diquat | MR | 31 | 2018 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 9 of 296 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFBA | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBS | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 9/27/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 9/27/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 4:2 FTS | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| ADONA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 9/27/2023 | 52.3000 µg/L | 9 µg/L | Detected |
| 6:2 FTS | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 8:2 FTS | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 9/27/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeS | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 9/27/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 9/27/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 9/27/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFHxS | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 11Cl-PF3OUdS | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 9/27/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFNA | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 9/27/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFMPA | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| lithium | 9/27/2023 | 52.6000 µg/L | 9 µg/L | Detected |
| PFBS | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 9/27/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| ADONA | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 9/27/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHpS | 9/27/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 9/27/2023 | <0.005 µg/L | 0.005 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.