MAPLEWOOD ADDITION WATER COOP
PWS ID: WA5351400 · Renton, Washington 98058
Population Served
435
Total Violations
80
Health-Based Violations
1
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 155
- County
- King
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 65
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Consumer Confidence Rule | Other | 12 | 2021 |
| Coliform (TCR) | MR | 6 | 2015 |
| Arsenic | MR | 3 | 2005 |
| Cadmium | MR | 3 | 2005 |
| Chromium | MR | 3 | 2005 |
| Fluoride | MR | 3 | 2005 |
| Nickel | MR | 3 | 2005 |
| Selenium | MR | 3 | 2005 |
| Antimony, Total | MR | 3 | 2005 |
| Mercury | MR | 3 | 2005 |
| Thallium, Total | MR | 3 | 2005 |
| CYANIDE | MR | 3 | 2005 |
| Barium | MR | 3 | 2005 |
| Beryllium, Total | MR | 3 | 2005 |
| cis-1,2-Dichloroethylene | MR | 1 | 2005 |
| o-Dichlorobenzene | MR | 1 | 2005 |
| p-Dichlorobenzene | MR | 1 | 2005 |
| Vinyl chloride | MR | 1 | 2005 |
| trans-1,2-Dichloroethylene | MR | 1 | 2005 |
| 1,2-Dichloroethane | MR | 1 | 2005 |
| 1,1,1-Trichloroethane | MR | 1 | 2005 |
| 1,2-Dichloropropane | MR | 1 | 2005 |
| Trichloroethylene | MR | 1 | 2005 |
| 1,1,2-Trichloroethane | MR | 1 | 2005 |
| Tetrachloroethylene | MR | 1 | 2005 |
| CHLOROBENZENE | MR | 1 | 2005 |
| Ethylbenzene | MR | 1 | 2005 |
| Lead and Copper Rule | MR | 1 | 2015 |
| Coliform (TCR) | MCL | 1 | 1994 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.