CITY REPORT
ID
4 HEALTH VIOLATIONS
Twin Falls, ID Water Quality Report
1 ZIP code · 3 water systems · Updated 2026-03-16
Data: EPA SDWIS Last verified: 2026-03-16
1
ZIP Codes
3
Water Systems
1
ZIPs with Violations
Zone 1
Radon Risk (High)
Overview
We track water quality and home safety data for 1 ZIP code in Twin Falls, Idaho, covering 3 community water systems serving approximately 56,121 people.
1 of 1 ZIP code (100%) have recorded EPA violations. 4 health-based violations documented.
Water Sources
Twin Falls water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Twin Falls
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead | Inorganic | 18 | 1 |
| Contaminant 1925 | Other | 8 | 1 |
| Contaminant 1996 | Other | 8 | 1 |
| Barium | Inorganic | 6 | 1 |
| Contaminant 1016 | Other | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 83301 | — | 32 | 4 | TWIN FALLS CITY OF |
All ZIP Codes in Twin Falls
- 83301 — 32 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.