WILLIAMS CITY OF
PWS ID: AZ0403026 · WILLIAMS, Arizona 86046
Population Served
3,145
Total Violations
314
Health-Based Violations
23
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,883
- County
- Coconino
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 248
- Treatment Tech Violations
- 17
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 30 | 2025 |
| Coliform (TCR) | MR | 28 | 2015 |
| Interim Enhanced Surface Water Treatment Rule | MR | 21 | 2022 |
| Consumer Confidence Rule | Other | 20 | 2025 |
| TTHM | MR | 19 | 2016 |
| Total Haloacetic Acids (HAA5) | MR | 19 | 2012 |
| Surface Water Treatment Rule | MR | 16 | 2022 |
| E. COLI | MR | 16 | 2018 |
| Interim Enhanced Surface Water Treatment Rule | TT | 11 | 2023 |
| Public Notice | Other | 6 | 2023 |
| CARBON, TOTAL | TT | 6 | 2022 |
| TTHM | MCL | 4 | 2006 |
| Lead and Copper Rule | MR | 4 | 2021 |
| CARBON, TOTAL | MR | 4 | 2023 |
| cis-1,2-Dichloroethylene | MR | 3 | 1999 |
| o-Dichlorobenzene | MR | 3 | 1999 |
| p-Dichlorobenzene | MR | 3 | 1999 |
| 1,2-Dichloroethane | MR | 3 | 1999 |
| 2,4-D | MR | 3 | 1999 |
| DICHLOROMETHANE | MR | 3 | 1999 |
| 1,1-Dichloroethylene | MR | 3 | 1999 |
| 1,1,1-Trichloroethane | MR | 3 | 1999 |
| Carbon tetrachloride | MR | 3 | 1999 |
| CHLOROBENZENE | MR | 3 | 1999 |
| Benzene | MR | 3 | 1999 |
| Styrene | MR | 3 | 1999 |
| 1,2-Dichloropropane | MR | 3 | 1999 |
| Trichloroethylene | MR | 3 | 1999 |
| 1,1,2-Trichloroethane | MR | 3 | 1999 |
| trans-1,2-Dichloroethylene | MR | 3 | 1999 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.