Water Hardness in Woodinville, WA
Washington · 2 zip codes · 48 matched water systems
City avg (weighted): 17 PPM
Dataset updated March 9, 202648 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Woodinville, WA Water Hard or Soft?
The displayed hardness for Woodinville, WA is 22 PPM (1.3 GPG) from Seattle Public Utilities, classified as soft. The citywide weighted average is 17 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 48 matched water systems and 2 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 Woodinville
These systems are matched to Woodinville, 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 |
|---|---|---|---|
| Seattle Public Utilities WA5377050 | surface water | 22 PPM SoftUSGS estimate: 110 PPM | |
| Bellevue City Of WA5305575 | surface water | 22 PPM SoftUSGS estimate: 67 PPM | |
| Everett Public Works Dept. City Of WA5324050 | surface water | 12 PPM SoftUSGS estimate: 66 PPM | |
| Alderwood Water District WA5301300 | surface water | 12 PPM SoftUSGS estimate: 93 PPM | |
| Kent Water Department WA5338150 | surface water | 22 PPM SoftUSGS estimate: 110 PPM |
Zip Codes in Woodinville, 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 Woodinville, WA.
Frequently Asked Questions
How hard is the water in Woodinville, WA?
The citywide weighted average water hardness in Woodinville, WA is 17 PPM (1 GPG), classified as soft. This is based on 48 matched water systems. The gauge highlights Seattle Public Utilities, a verified treated-water system, because individual systems can differ from the citywide average.
Do I need a water softener in Woodinville, WA?
At 17 PPM, the citywide average is relatively soft. A water softener is generally not necessary.
Is hard water in Woodinville, 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 Woodinville, WA?
Woodinville, Washington is served by 48 matched water systems across 2 zip codes.
Learn More About Your Water
Water 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.
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Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.
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