Water Quality in Twin Falls, ID (83321)
EPA violation data for public water systems serving ZIP code 83321.
No Health-Based Violations
None of the 2 water systems serving this ZIP have exceeded federal contaminant limits in the past 5 years. There are5 monitoring/reporting violations (missed testing deadlines), all resolved.
Better than 53% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
482
Population
2
Water Systems
5
Violations (5yr)
0
Health-Based
Location
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Water Systems Serving This Area (2)
Twin Falls City Of
All resolvedCastleford City Of
Contaminants Found
At high levels, nitrate can cause blue baby syndrome in infants.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Lead & Copper Levels
Lead (Pb)
Within limitSampled: Jul 2025
How Does This Compare?
Twin Falls (83321) has more violations than 53% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 5, most of which are monitoring/reporting issues.
Water Filter Recommendations
No contaminant issues detected. For general protection, a basic carbon filter removes common impurities like chlorine and sediment. Look for NSF/ANSI 42 certified products.