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
101–125 of 174City of Ashton
ID7220004 · 1,129 served
Dry Creek Water Company Llc
ID4010266 · 1,125 served
City of Moyie Springs
ID1110021 · 1,123 served
Remington Rec Water Dist
ID1280270 · 1,104 served
Caldwell Housing Authority
ID3140012 · 1,100 served
City of Arco
ID6120001 · 1,080 served
City of Genesee
ID2290015 · 1,044 served
City of Plummer
ID1050021 · 1,034 served
Black Rock Utilities Inc
ID1280290 · 1,014 served
City of Franklin
ID6210007 · 1,000 served
City of Cascade
ID4430012 · 1,000 served
Carey Water and Sewer
ID5070010 · 993 served
City of Athol
ID1280006 · 990 served
City of Hagerman
ID5240012 · 988 served
Greenferry Water & Sewer District
ID1280077 · 978 served
Cottonwood Water Dept
ID2250013 · 977 served
Schweitzer Basin Water Company
ID1090124 · 955 served
Stoneridge Utilities
ID1090009 · 940 served
Teton Springs Water and Sewer Company
ID7410033 · 924 served
City of Grace
ID6150010 · 920 served
City of Challis
ID7190013 · 900 served
City of Council
ID3020002 · 900 served
City of Hazelton
ID5270007 · 899 served
City of Dover
ID1090193 · 865 served
City of Troy
ID2290041 · 850 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
City of Ashton
Violation history, PFAS records, and official source links
Dry Creek Water Company Llc
Violation history, PFAS records, and official source links
City of Moyie Springs
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