Drinking Water Contaminants Found in Post Falls, Idaho by the EPA

The Environmental Protection Agency (EPA) found nine total water contaminants in Post Falls, Idaho. In a report by the Environmental Working Group (EWG), the group found that five of those contaminants exceed EWG health guidelines. Municipal water in Post Falls comes from the Rathdrum Prairie Aquifer.

WATER CONTAMINANTS IN POST FALLS

• Arsenic: 3.79 ppb (EWG HEALTH GUIDELINE: 0.004 ppb)*
• Chromium (hexavalent): 0.221 ppb (EWG HEALTH GUIDELINE: 0.02 ppb)*
• Nitrate: 0.730 ppm (EWG HEALTH GUIDELINE: 0.14 ppm)*
• Nitrate & Nitrite: 0.628 ppm (EWG HEALTH GUIDELINE: 0.14 ppm)*
• Radium, combined (-226 and -228): 0.34 pCi/L (EWG HEALTH GUIDELINE: 0.05 pCi/L)*
• Manganese: 0.1000 ppb (EWG HEALTH GUIDELINE: 100 ppb)
• Strontium: 0.0758 ppb (EWG HEALTH GUIDELINE: 1,500 ppb)
• Uranium: 0.36 pCi/L (EWG HEALTH GUIDELINE: 0.43 pCi/L)
• Vanadium: 0.227 ppb (EWG HEALTH GUIDELINE: 21 ppb)
• *Above EWG Health Guideline

EFFECTIVE METHODS OF FILTRATION

• Arsenic: reverse osmosis and ion exchange
• Chromium (hexavalent): reverse osmosis and ion exchange
• Nitrate: reverse osmosis and ion exchange
• Nitrate & Nitrite: reverse osmosis and ion exchange
• Radium, combined (-226 and -228): reverse osmosis and ion exchange
• Manganese: ion exchange
• Strontium: reverse osmosis and ion exchange
• Uranium: reverse osmosis and ion exchange
• Vanadium: ion exchange

COMPLIMENTARY WATER TEST

If you’re a homeowner in Post Falls and you’re concerned about your water quality, we offer complimentary in-home water testing. We also provide lab-certified water testing for purchase if you would like to test your water yourself.

SOURCE

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

Published on: 3/19/2026

Last updated on: 3/19/2026