Coeur d’Alene Water Contaminants Filtration Guide

A water quality report for Coeur d’Alene, ID, conducted by the Environmental Protection Agency (EPA) and the Environmental Working Group (EWG) in 2023 found 15 total water contaminants in Coeur d’Alene’s municipal water source. The main water source in Coeur d’Alene is the Rathdrum Prairie Aquifer, which covers 250 square miles of Idaho. 

Water Contaminants Found in Coeur d’Alene’s Municipal Water

• Arsenic: 4.77 ppb (Health Guideline: 0.004 ppb )
• Chromium (hexavalent): 0.167 ppb (Health Guideline: 0.02 ppb)
• Haloacetic Acids (HAA9): 0.151 ppb (Health Guideline: 0.06 ppb)
• Nitrate: 0.849 ppm (Health Guideline: 0.14 ppm)
• Nitrate & Nitrite: 1.29 ppm (Health Guideline: 0.14 ppm)
• Total Trihalomethanes: 0.610 ppb (Health Guideline: 0.15 ppb)
• Uranium: 1.52 pCi/L (Health Guideline: 0.42 pCi/L)
• Barium: 35.0 ppb (Health Guideline: 700 ppb)
• Chlorate: 5.55 ppb (Health Guideline: 210 ppb)
• Colbalt: 0.0265 ppb (Health Guideline: 70 ppb)
• Germanium: 0.0200 ppb (NO HEALTH GUIDELINE)
• Manganese: 10.1 ppb (Health Guideline: 100 ppb)
• Radium, combined (-226 & -228): 0.05 pCi/L (Health Guideline: 0.05 pCi/L)
• Strontium: 0.0932 ppb (Health Guideline: 1,500 ppb)
• Vanadium: 0.167 ppb (Health Guideline: 21 ppb)

Effective Methods of Filtration for Coeur d’Alene Water

• Arsenic: reverse osmosis and ion exchange
• Chromium (hexavalent): reverse osmosis and ion exchange
• Haloacetic Acids (HAA9): activated carbon and reverse osmosis
• Nitrate: reverse osmosis and ion exchange
• Nitrate & Nitrite: reverse osmosis and ion exchange
• Total Trihalomethanes: activated carbon and reverse osmosis
• Uranium: reverse osmosis and ion exchange
• Barium: reverse osmosis and ion exchange
• Colbalt: reverse osmosis and ion exchange
• Germanium: reverse osmosis
• Manganese: ion exchange
• Radium, combined (-226 & -228): reverse osmosis and ion exchange
• Strontium: reverse osmosis and ion exchange
• Vanadium: ion exchange

*Most effective method of filtration for Coeur d’Alene Water: Reverse Osmosis

How to Find Effective Filtration in Coeur d’Alene

We offer filtration solutions to homeowners in Coeur d’Alene and the surrounding areas. Receive your complimentary water test and find out what’s in your water today!

SOURCES

Environmental Working Group (EWG) “EWG’s Tap Water Database: What’s in Your Drinking Water?” 2024 https://www.ewg.org/tapwater/system.php?pws=ID1280053

Environmental Working Group (EWG) “EWG’s Tap Water Database: Contaminants in Your Water.” Www.ewg.org, www.ewg.org/tapwater/chemical-contaminants.php

Environmental Protection Agency (EPA) “US EPA.” 2023, www.epa.gov  

Published on: 2/10/2026

Last updated on: 2/10/2026