Water Hardness in Woodinville, WA

Q: Do I need a water softener in Woodinville, WA?

At a citywide weighted average of 17 PPM, Woodinville has relatively soft water. A water softener is generally not necessary.

Q: How many water systems serve Woodinville, WA?

Woodinville, Washington has 48 matched water systems across 2 zip codes.

Washington · 2 zip codes · 48 matched water systems

22 PPM

1.3 GPG

Soft

0Soft60120180300+

Verified — Annual Water Quality Report

City avg (weighted): 17 PPM

Dataset updated March 9, 202648 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

Seattle Public Utilities

WA5377050

Water source: surface water

Serves: 1,091,904

USGS environmental estimate: 110 PPM

Source context

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.

Source basis

47 verified treated-water sources

48 matched systems total for this city; treated-water reports are prioritized when available.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.

Data recency

March 9, 2026

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

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.

48 water systems

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Seattle Public Utilities WA5377050	surface water	22 PPM Soft USGS estimate: 110 PPM	1,091,904	Verified — Annual Water Quality Report
Bellevue City Of WA5305575	surface water	22 PPM Soft USGS estimate: 67 PPM	317,330	Verified — Annual Water Quality Report
Everett Public Works Dept. City Of WA5324050	surface water	12 PPM Soft USGS estimate: 66 PPM	215,774	Verified — Annual Water Quality Report
Alderwood Water District WA5301300	surface water	12 PPM Soft USGS estimate: 93 PPM	200,000	Verified — Annual Water Quality Report
Kent Water Department WA5338150	surface water	22 PPM Soft USGS estimate: 110 PPM	166,421	Verified — Annual Water Quality Report

Seattle Public Utilities

WA5377050

Soft

22 PPMsurface water1,091,904 servedVerified — Annual Water Quality Report

Source water: 110 PPM

Bellevue City Of

WA5305575

Soft

22 PPMsurface water317,330 servedVerified — Annual Water Quality Report

Source water: 67 PPM

Everett Public Works Dept. City Of

WA5324050

Soft

12 PPMsurface water215,774 servedVerified — Annual Water Quality Report

Source water: 66 PPM

Alderwood Water District

WA5301300

Soft

12 PPMsurface water200,000 servedVerified — Annual Water Quality Report

Source water: 93 PPM

Kent Water Department

WA5338150

Soft

22 PPMsurface water166,421 servedVerified — Annual Water Quality Report

Source water: 110 PPM

Showing the first 5 systems. Expand to review all matched systems.

Zip Codes in Woodinville, WA

9807222 9829612

What This Means For You

Recommendations are based on the displayed hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft water!

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.

Submit Your Data

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

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