BLACK DIAMOND WATER DEPT
PWS ID: WA5307220 · BLACK DIAMOND, Washington 98010
Population Served
2,420
Total Violations
194
Health-Based Violations
13
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,355
- County
- King
- School/Daycare
- No
- MCL Violations
- 13
- Monitoring Violations
- 178
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 17 | 2006 |
| Coliform (TCR) | MCL | 13 | 1995 |
| Coliform (TCR) | MR | 7 | 1992 |
| Diquat | MR | 7 | 2008 |
| Heptachlor epoxide | MR | 7 | 2008 |
| Pentachlorophenol | MR | 6 | 2008 |
| Trichloroethylene | MR | 3 | 2008 |
| Aldicarb sulfone | MR | 3 | 2008 |
| Ethylbenzene | MR | 3 | 2008 |
| Styrene | MR | 3 | 2008 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2008 |
| HEXACHLOROBENZENE | MR | 3 | 2008 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2008 |
| Carbofuran | MR | 3 | 2008 |
| Endrin | MR | 3 | 2008 |
| 1,2-Dichloroethane | MR | 3 | 2008 |
| 2,4,5-TP | MR | 3 | 2008 |
| o-Dichlorobenzene | MR | 3 | 2008 |
| trans-1,2-Dichloroethylene | MR | 3 | 2008 |
| Atrazine | MR | 3 | 2008 |
| 1,1,2-Trichloroethane | MR | 3 | 2008 |
| Benzene | MR | 3 | 2008 |
| Chlordane | MR | 3 | 2008 |
| Dalapon | MR | 3 | 2008 |
| Heptachlor | MR | 3 | 2008 |
| Tetrachloroethylene | MR | 3 | 2008 |
| OXAMYL | MR | 3 | 2008 |
| Methoxychlor | MR | 3 | 2008 |
| Benzo(a)pyrene | MR | 3 | 2008 |
| Picloram | MR | 3 | 2008 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.