PROGRESSIVE FLAT WATER ASSN
PWS ID: WA5369650 · Tonasket, Washington 98855-9433
Population Served
335
Total Violations
242
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 84
- County
- Okanogan
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 237
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Pentachlorophenol | MR | 6 | 2005 |
| DICHLOROMETHANE | MR | 5 | 2005 |
| 1,1-Dichloroethylene | MR | 5 | 2005 |
| trans-1,2-Dichloroethylene | MR | 5 | 2005 |
| Carbon tetrachloride | MR | 5 | 2005 |
| 1,2-Dichloropropane | MR | 5 | 2005 |
| 1,1,2-Trichloroethane | MR | 5 | 2005 |
| Tetrachloroethylene | MR | 5 | 2005 |
| CHLOROBENZENE | MR | 5 | 2005 |
| Toluene | MR | 5 | 2005 |
| Toxaphene | MR | 5 | 2005 |
| Di(2-ethylhexyl) adipate | MR | 5 | 2005 |
| Di(2-ethylhexyl) phthalate | MR | 5 | 2005 |
| Atrazine | MR | 5 | 2005 |
| LASSO | MR | 5 | 2005 |
| Heptachlor | MR | 5 | 2005 |
| HEXACHLOROBENZENE | MR | 5 | 2005 |
| Benzo(a)pyrene | MR | 5 | 2005 |
| Dalapon | MR | 5 | 2005 |
| Aldicarb sulfoxide | MR | 5 | 2005 |
| Aldicarb sulfone | MR | 5 | 2005 |
| Aldicarb | MR | 5 | 2005 |
| 1,2,4-Trichlorobenzene | MR | 5 | 2005 |
| Ethylbenzene | MR | 5 | 2005 |
| Methoxychlor | MR | 5 | 2005 |
| p-Dichlorobenzene | MR | 5 | 2005 |
| Trichloroethylene | MR | 5 | 2005 |
| 2,4,5-TP | MR | 5 | 2005 |
| Dinoseb | MR | 5 | 2005 |
| o-Dichlorobenzene | MR | 5 | 2005 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.