STATE REPORT ID 77 HEALTH VIOLATIONS

Idaho Water Quality & Safety Report

37 ZIP codes · 96 water systems · UPC plumbing code · Updated 2026-03-16

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-03-16

37
ZIP Codes
96
Water Systems
27
ZIPs with Violations
UPC
Plumbing Code

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 37 ZIP codes across Idaho, covering 96 community water systems that serve approximately 947,315 people.

27 of 37 ZIP codes (73%) have recorded EPA violations. 77 health-based violations have been documented.

Plumbing Regulations

Idaho follows the Uniform Plumbing Code (2018 edition).

  • Plumbing code: UPC (2018)
  • Homeowner DIY: Allowed with permit
  • Water heater permit: Required
  • Annual backflow test: Required

Full Idaho regulations →

Areas with Most Violations

ZIP CodeCitySafety ScoreViolationsHealth-BasedSystem
83440Rexburg—37418REXBURG CITY OF
83401Idaho Falls—1876IDAHO FALLS CITY OF
83353Sun Valley—631SUN VALLEY WATER AND SEWER DIST
83226Challis—450CHALLIS CITY OF
83701Boise—436VEOLIA WATER IDAHO
83237Franklin—387FRANKLIN CITY OF
83605Caldwell—350CALDWELL CITY OF
83843Moscow—331MOSCOW WATER DEPT
83301Twin Falls—324TWIN FALLS CITY OF
83211American Falls—3011AMERICAN FALLS CITY OF

Areas with No Violations

ZIP CodeCitySafety ScoreSystemPopulation
83210Aberdeen—ABERDEEN CITY OF2,088
83215Atomic City—ATOMIC WATER WORKS35
83217Bancroft—BANCROFT CITY OF350
83236Firth—FIRTH CITY OF511
83239Georgetown—GEORGETOWN CITY OF476
83251Mackay—MACKAY CITY OF566
83254Montpelier—MONTPELIER CITY OF2,772
83256Moreland—MORELAND WATER AND SEWER DISTRICT364
83814Coeur D Alene—COEUR D ALENE CITY OF54,115
83854Post Falls—POST FALLS CITY OF20,285

Lead & Copper

  • 0 ZIP codes exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 0 ZIP codes (0%)
  • Moderate risk (Zone 2): 0 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

All 37 ZIP Codes in Idaho

Data Sources

Updated daily.

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