INDEX WATER DEPT
PWS ID: WA5335600 · INDEX, Washington 98256
Population Served
420
Total Violations
130
Health-Based Violations
18
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 129
- County
- Snohomish
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 110
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 18 | 1998 |
| Nitrate | MR | 14 | 2013 |
| Lead and Copper Rule | MR | 13 | 2022 |
| Coliform (TCR) | MR | 4 | 2000 |
| Barium | MR | 3 | 2005 |
| Chromium | MR | 3 | 2005 |
| Fluoride | MR | 3 | 2005 |
| Mercury | MR | 3 | 2005 |
| Selenium | MR | 3 | 2005 |
| Arsenic | MR | 3 | 2005 |
| Cadmium | MR | 3 | 2005 |
| Nickel | MR | 2 | 2005 |
| Antimony, Total | MR | 2 | 2005 |
| cis-1,2-Dichloroethylene | MR | 2 | 2017 |
| o-Dichlorobenzene | MR | 2 | 2017 |
| 1,1-Dichloroethylene | MR | 2 | 2017 |
| 1,2-Dichloroethane | MR | 2 | 2017 |
| Carbon tetrachloride | MR | 2 | 2017 |
| CHLOROBENZENE | MR | 2 | 2017 |
| Benzene | MR | 2 | 2017 |
| Ethylbenzene | MR | 2 | 2017 |
| p-Dichlorobenzene | MR | 2 | 2017 |
| trans-1,2-Dichloroethylene | MR | 2 | 2017 |
| 1,1,1-Trichloroethane | MR | 2 | 2017 |
| Toluene | MR | 2 | 2017 |
| Revised Total Coliform Rule | MON | 2 | 2024 |
| Thallium, Total | MR | 2 | 2005 |
| Trichloroethylene | MR | 2 | 2017 |
| Styrene | MR | 2 | 2017 |
| Tetrachloroethylene | MR | 2 | 2017 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.