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
51–75 of 174City of Gooding
ID5240009 · 3,706 served
Eagle, City of (eastern Zone)
ID4010201 · 3,702 served
St Anthony
ID7220067 · 3,606 served
City of Ketchum
ID5070028 · 3,555 served
Rimrock Service Area
ID1280009 · 3,493 served
Sun Valley Water and Sewer Dist
ID5070051 · 3,400 served
City of Bonners Ferry
ID1110003 · 3,367 served
Idoc Sbx Complex
ID4010141 · 3,309 served
City of Salmon
ID7300042 · 3,158 served
Grangeville Water Dept
ID2250023 · 3,151 served
City of Soda Springs
ID6150017 · 3,111 served
City of Heyburn
ID5340006 · 3,000 served
City of Wendell
ID5240028 · 3,000 served
City of Homedale
ID3370012 · 2,999 served
Filer Water Works
ID5420021 · 2,858 served
City of Spirit Lake
ID1280177 · 2,825 served
City of Montpelier
ID6040021 · 2,772 served
City of Bellevue
ID5070004 · 2,747 served
Iona Water Dept
ID7100041 · 2,717 served
Dalton Water Assn Inc
ID1280059 · 2,598 served
City of Orofino
ID2180024 · 2,459 served
Three Mile Water Dist
ID1110028 · 2,458 served
City of Sugar City
ID7330026 · 2,395 served
E Shoshone County Water Dist Wallace
ID1400019 · 2,388 served
City of Victor
ID7410013 · 2,361 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 Gooding
Violation history, PFAS records, and official source links
Eagle, City of (eastern Zone)
Violation history, PFAS records, and official source links
St Anthony
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