HOLLISTER CITY OF
PWS ID: ID5420030 · HOLLISTER, Idaho 83301
Population Served
220
Total Violations
107
Health-Based Violations
14
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 120
- County
- Twin Falls
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 89
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Gross Alpha, Excl. Radon and U | MR | 27 | 2013 |
| Chlorine | MR | 23 | 2025 |
| Coliform (TCR) | MR | 19 | 2012 |
| Coliform (TCR) | MCL | 9 | 2014 |
| TTHM | MR | 6 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 6 | 2012 |
| Nitrate | MR | 4 | 2015 |
| Gross Alpha, Excl. Radon and U | MCL | 4 | 2008 |
| Radium-228 | MR | 2 | 2012 |
| Revised Total Coliform Rule | MON | 2 | 2025 |
| Consumer Confidence Rule | Other | 2 | 1999 |
| TTHM | MCL | 1 | 2005 |
| Public Notice | Other | 1 | 2011 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.