State Hub
Idaho Water Quality
174
Utilities in database
1.5M
Residents served
0
With open violations
56
PFAS monitored
Quick Answer
Idaho public drinking water is served by 174 EPA-tracked water systems, providing service to approximately 1.5 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 56 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 40% of ID residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for Idaho's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
Drinking Water in Idaho
Idaho has 174 community water systems serving approximately 1.5 million residents. Primary water sources include groundwater. The most commonly reported contaminants include arsenic, nitrates. 40% of Idaho residents rely on private wells. DEQ holds primary enforcement authority under the Safe Drinking Water Act.
Safest Large Utilities
Idaho systems with no open health violations serving 10,000+ residents.
Utilities in Idaho
1–25 of 174Veolia Water Idaho
ID4010016 · 264,978 served
Meridian Water Dept
ID4010097 · 147,340 served
City of Nampa
ID3140080 · 100,200 served
City of Caldwell
ID3140013 · 74,000 served
City of Idaho Falls
ID7100039 · 69,450 served
City of Pocatello
ID6030043 · 58,231 served
City of Twin Falls
ID5420058 · 56,121 served
City of Coeur D Alene
ID1280053 · 54,115 served
City of Rexburg
ID7330022 · 39,790 served
City of Kuna
ID4010085 · 32,038 served
Moscow Water Dept
ID2290023 · 26,000 served
Falls Water Company Inc
ID7100030 · 22,650 served
City of Post Falls
ID1280147 · 20,285 served
Lewiston Orchards Irrigation Dist
ID2350015 · 20,000 served
City of Ammon
ID7100004 · 17,338 served
City of Chubbuck
ID6030008 · 15,842 served
City of Lewiston
ID2350014 · 15,001 served
City of Mountain Home
ID4200032 · 14,651 served
Star Sewer and Water Dist Water System
ID4010220 · 14,000 served
City of Blackfoot
ID6060007 · 13,224 served
City of Middleton
ID3140074 · 13,190 served
City of Jerome
ID5270011 · 13,135 served
Garden City Water and Sewer System
ID4010066 · 12,500 served
Sandpoint Public Works Dept
ID1090121 · 12,284 served
East Greenacres Irrigation Dist
ID1280064 · 11,165 served
Key Contaminant Concerns in Idaho
These contaminants appear most frequently in Idaho utility records or pose elevated risk in this region based on EPA data.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always caused by human activity — nitrate is converted in the digestive system to nitrite, which then reacts with hemoglobin to form methemoglobin, a form of hemoglobin that cannot carry oxygen. In the body, nitrite also reacts with amines in food to form N-nitroso compounds (nitrosamines) — known carcinogens classified by the IARC as Group 2A (probable human carcinogens). The United States applies over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination in U.S. groundwater.
EPA limit: 10 mg/L
Arsenic
Arsenic (As) occurs naturally in rock and soil, dissolving into groundwater through natural weathering processes. Inorganic arsenic — the form found in drinking water — is a known human carcinogen. The western United States has particularly arsenic-rich geological formations, but elevated levels have been found in 48 states. Arsenic is tasteless and odorless.
EPA limit: 10 ppb
City Water Reports in Idaho
Tap water quality pages for Idaho cities — violations, PFAS records, utility profiles, and official source links.
Idaho PFAS Watchlist — all utilities with official recordsIndependent Water Testing
Find a certified lab in Idaho
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Idaho labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Idaho
Veolia Water Idaho
Violation history, PFAS records, and official source links
Meridian Water Dept
Violation history, PFAS records, and official source links
City of Nampa
Violation history, PFAS records, and official source links
PFAS monitoring records — Idaho
56 water systems in Idaho with EPA UCMR 5 records
Lead in Idaho drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Idaho drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Idaho
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Idaho Drinking Water
Does Idaho drinking water have PFAS?
56 Idaho water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Idaho water utilities have open violations?
Browse Idaho utility compliance records and violation history
How do I test my water in Idaho?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from ID tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Idaho PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Idaho water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Idaho Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-22