GRAND LAKE PWA
PWS ID: OK1021691 · OCHELATA, Oklahoma 74051
Population Served
2,800
Total Violations
362
Health-Based Violations
144
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,327
- County
- Delaware
- School/Daycare
- No
- MCL Violations
- 118
- Monitoring Violations
- 197
- Treatment Tech Violations
- 26
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MCL | 70 | 2013 |
| CARBON, TOTAL | MR | 54 | 2009 |
| TTHM | MCL | 43 | 2013 |
| Surface Water Treatment Rule | MR | 30 | 2004 |
| CARBON, TOTAL | TT | 25 | 2014 |
| Coliform (TCR) | MR | 24 | 2010 |
| Consumer Confidence Rule | Other | 21 | 2023 |
| Chlorine | MR | 9 | 2018 |
| Interim Enhanced Surface Water Treatment Rule | MR | 8 | 2005 |
| Gross Alpha, Excl. Radon and U | MR | 8 | 2022 |
| Combined Radium (-226 and -228) | MR | 8 | 2022 |
| Gross Beta Particle Activity | MR | 8 | 2022 |
| Combined Uranium | MR | 8 | 2022 |
| Total Haloacetic Acids (HAA5) | MR | 7 | 2015 |
| TTHM | MR | 7 | 2015 |
| Lead and Copper Rule | MR | 7 | 2024 |
| Nitrate-Nitrite | MR | 6 | 2006 |
| Revised Total Coliform Rule | MON | 5 | 2018 |
| Combined Radium (-226 and -228) | MCL | 5 | 2024 |
| Arsenic | MR | 4 | 2007 |
| E. COLI | MR | 4 | 2020 |
| Surface Water Treatment Rule | TT | 1 | 1993 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.