Water Hardness in Spokane, WA
Washington · 14 zip codes · 39 matched water systems
City avg (weighted): 218 PPM
Dataset updated March 9, 202639 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Spokane, WA Water Hard or Soft?
The displayed hardness for Spokane, WA is 218 PPM (12.7 GPG) from Spokane City Of, classified as hard. The citywide weighted average is 218 PPM.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
How this city reading is built
This city reading is a weighted rollup across 39 matched water systems and 14 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.
Water Systems in Spokane
These systems are matched to Spokane, WA. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Spokane City Of WA5383100 | groundwater | 218 PPM HardUSGS estimate: 181 PPM | |
| Whitworth Water District 2 WA5396601 | groundwater | 218 PPM HardUSGS estimate: 181 PPM | |
| Vera Water & Power WA5391450 | groundwater | 218 PPM HardUSGS estimate: 181 PPM | |
| Consolidated Irrig Dist 19 System 2 WA5310221 | groundwater | 218 PPM HardUSGS estimate: 94 PPM | |
| Spo Co Water Dist 3 Sys 1 WA5393351 | groundwater | 218 PPM HardUSGS estimate: 181 PPM |
Zip Codes in Spokane, WA
What This Means For You
Use this city reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.
Know your water hardness?
If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Spokane, WA.
Frequently Asked Questions
How hard is the water in Spokane, WA?
The citywide weighted average water hardness in Spokane, WA is 218 PPM (12.7 GPG), classified as hard. This is based on 39 matched water systems.
Do I need a water softener in Spokane, WA?
With a citywide average hardness of 218 PPM, a water softener is recommended for homes in Spokane. Confirm your tap reading before sizing equipment.
Is hard water in Spokane, WA safe to drink?
Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.
How many water systems serve Spokane, WA?
Spokane, Washington is served by 39 matched water systems across 14 zip codes.
Learn More About Your Water
How to Test Water Hardness at Home
Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.
8 min readWater Hardness Scale: PPM and GPG Chart
Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.
10 min readWell Water Hardness: Why It's Usually Hard & How to Treat It
Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.
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