Post Falls Tap Water Quality Report
Post Falls's water has 2 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
No single water system serves most of Post Falls (45,800 residents, Census 2024 estimate). Its large systems are POST FALLS CITY OF (EPA counts 17,422 people served, about 38% of Post Falls's population); COEUR D ALENE CITY OF (EPA counts 54,115 people served, more than Post Falls's population); EAST GREENACRES IRRIGATION DIST (EPA counts 10,600 people served, about 23% of Post Falls's population). EPA's counts may include people served outside Post Falls, so each share is at most that. Check which one bills you: each system's figures are shown separately below.
- POST FALLS CITY OF: 145 contaminants tested, 2 above EPA MCLGs; health-based violations since 2020: 1
- COEUR D ALENE CITY OF: 154 contaminants tested, 3 above EPA MCLGs; health-based violations since 2020: 0
- EAST GREENACRES IRRIGATION DIST: 97 contaminants tested, 3 above EPA MCLGs; health-based violations since 2020: 0
Other systems listed for Post Falls with results above guidelines: EAST GREENACRES IRRIGATION DIST (3 above guidelines), COEUR D ALENE CITY OF (3 above guidelines), SOUTH RIVER WATER ASSN (1 above guidelines), ROSS POINT WATER DIST (4 above guidelines)
Water systems
3 large systems
Residents (Census 2024)
45,800
Health-based violations since 2020
1
POST FALLS CITY OF. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Apr 2025 · POST FALLS CITY OF
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Post Falls Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Post Falls's water has 2 contaminants above EPA health-based guidelines (MCLGs).
POST FALLS CITY OF, Post Falls's water system, serves 17,422 people. 8 other systems are listed for Post Falls. Each system's results are listed under its own name, never added to POST FALLS CITY OF's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for POST FALLS CITY OF is from Apr 2025.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Idaho
Post Falls Water Service Areas
What these numbers actually mean for Post Falls, ID
We read Post Falls, ID’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 2 contaminants above EPA MCLGs and 5 contaminants with an EPA health goal detected in some samples (no level on file)
- 141 results on file
- 23 PFAS compounds on record
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Recommended Water Filters for Post Falls
Based on Post Falls's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
AquaTru
Classic
NSF Certified:
Flow Rate
0.04 gpm
Daily Production
600 gpd
Highlights:
- Best overall contaminant reduction score
- Most performance certifications
- Lifetime warranty
- NSF-42, NSF-53, NSF-58, NSF-401 certified
Removes 23 contaminants:
+18 more
Molybdenum, Barium, Chlorine, Arsenic, 83+ contaminants, Calcium, Chloride, Copper, Magnesium, Nitrate, Phosphorus, Sodium, Sulfate, Total Dissolved Solids, Zinc, Total THMs, Chloroform, Nitrate (as N)
AquaTru
Carafe
NSF Certified:
Flow Rate
0.3 gpm
Daily Production
4 gpd
Highlights:
- Verified PFAS reduction
- Glass collection vessel
- Plug-and-play installation
- NSF-53, NSF-42, NSF-58, NSF-401, NSF-372 certified
Removes 17 contaminants:
+12 more
Arsenic, 83+ contaminants, Copper, Total THMs, Chloroform, Chloride, Sulfate, Nitrate (as N), Molybdenum, Barium, Strontium, Uranium
Waterdrop
A1
NSF Certified:
Flow Rate
0.042 gpm
Daily Production
130 gpd
Highlights:
- Built-in UV sterilization
- Easy maintenance with filter change reminders
- NSF-58 certified
- Hot and cold water dispensing
Removes 12 contaminants:
+7 more
Molybdenum, Sulfate, Strontium, Phosphorus, Chlorine, Barium, Nitrate
Solventum Purification Inc.
3MRO401
NSF Certified:
Daily Production
11.48 gpd
Highlights:
- NSF-58 certified reverse osmosis system
- 11.48 GPD production capacity
- Reduces total dissolved solids (TDS) for purer water
Removes 15 contaminants:
+10 more
Copper, Cryptosporidium, Fluoride, Lead, Radium 226, Radium 228, Radium, combined (-226 & -228), Selenium, Total Dissolved Solids, Turbidity
Test Your Water Quality
Professional laboratory testing provides accurate, detailed analysis of your drinking water.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
What Post Falls's water readings can explain
Utility-reported data for Post Falls includes sulfate — the readings behind these common tap water questions. We publish a city-level hardness figure for Post Falls, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Post Falls? Public-water results do not apply to private wells. See Kootenai County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Post Falls
Post Falls's tap water measures 5.2 grains per gallon (88.2 mg/L) — moderately hard on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for 5.2 gpg water in Post Falls — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For Idaho as a whole, read water softener cost in Idaho — priced against the plumber wage published for the state.
Frequently Asked Questions About Post Falls Tap Water
Post Falls's water has 2 contaminants above EPA MCLGs. We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach POST FALLS CITY OF. For a problem with your water now (discolored water, no water, low pressure, a leak), contact POST FALLS CITY OF directly.
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