LOWER GRANITE LOCK & DAM
PWS ID: WA5348705 · Pomeroy, Washington 99347
Population Served
120
Total Violations
41
Health-Based Violations
1
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Federal
- Connections
- 3
- County
- Garfield
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 39
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 7 | 2016 |
| Nitrate | MR | 2 | 2015 |
| Pentachlorophenol | MR | 2 | 2006 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2006 |
| ETHYLENE DIBROMIDE | MR | 1 | 2006 |
| Lead and Copper Rule | MR | 1 | 1998 |
| Heptachlor | MR | 1 | 2006 |
| 2,4,5-TP | MR | 1 | 2006 |
| Carbofuran | MR | 1 | 2006 |
| Endrin | MR | 1 | 2006 |
| Toxaphene | MR | 1 | 2006 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2006 |
| Dalapon | MR | 1 | 2006 |
| Aldicarb | MR | 1 | 2006 |
| Aldicarb sulfone | MR | 1 | 2006 |
| Atrazine | MR | 1 | 2006 |
| Coliform (TCR) | MCL | 1 | 2004 |
| Picloram | MR | 1 | 2006 |
| Diquat | MR | 1 | 2006 |
| Methoxychlor | MR | 1 | 2006 |
| Benzo(a)pyrene | MR | 1 | 2006 |
| Dinoseb | MR | 1 | 2006 |
| Chlordane | MR | 1 | 2006 |
| BHC-GAMMA | MR | 1 | 2006 |
| Simazine | MR | 1 | 2006 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2006 |
| HEXACHLOROBENZENE | MR | 1 | 2006 |
| Aldicarb sulfoxide | MR | 1 | 2006 |
| Hexachlorocyclopentadiene | MR | 1 | 2006 |
| OXAMYL | MR | 1 | 2006 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.