DELAWARE
PWS ID: OK1021502 · DELAWARE, Oklahoma 74027
Population Served
456
Total Violations
1,086
Health-Based Violations
344
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 358
- County
- Nowata
- School/Daycare
- No
- MCL Violations
- 139
- Monitoring Violations
- 586
- Treatment Tech Violations
- 205
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | MR | 365 | 2025 |
| CARBON, TOTAL | TT | 204 | 2025 |
| TTHM | MCL | 139 | 2013 |
| Public Notice | Other | 104 | 2024 |
| Consumer Confidence Rule | Other | 29 | 2024 |
| Lead and Copper Rule | MR | 24 | 2025 |
| Nitrate-Nitrite | MR | 18 | 2020 |
| CARBON, TOTAL | MR | 7 | 2004 |
| Arsenic | MR | 7 | 2007 |
| Xylenes, Total | MR | 7 | 2020 |
| DICHLOROMETHANE | MR | 7 | 2020 |
| p-Dichlorobenzene | MR | 7 | 2020 |
| Vinyl chloride | MR | 7 | 2020 |
| 1,1-Dichloroethylene | MR | 7 | 2020 |
| trans-1,2-Dichloroethylene | MR | 7 | 2020 |
| 1,1,1-Trichloroethane | MR | 7 | 2020 |
| Trichloroethylene | MR | 7 | 2020 |
| 1,1,2-Trichloroethane | MR | 7 | 2020 |
| Tetrachloroethylene | MR | 7 | 2020 |
| Benzene | MR | 7 | 2020 |
| Ethylbenzene | MR | 7 | 2020 |
| 1,2,4-Trichlorobenzene | MR | 7 | 2020 |
| cis-1,2-Dichloroethylene | MR | 7 | 2020 |
| 1,2-Dichloroethane | MR | 7 | 2020 |
| Carbon tetrachloride | MR | 7 | 2020 |
| 1,2-Dichloropropane | MR | 7 | 2020 |
| CHLOROBENZENE | MR | 7 | 2020 |
| Styrene | MR | 7 | 2020 |
| Toluene | MR | 7 | 2020 |
| o-Dichlorobenzene | MR | 7 | 2020 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.