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Water Hardness in Sedro Woolley, WA

Washington · 1 zip codes · 4 matched water systems

45 PPM
2.6 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 20264 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

Source context

How this city reading is built

This city reading is a weighted rollup across 4 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis
1 USGS-backed source
4 matched systems total for this city; USGS monitoring is used where treated-water reports are unavailable.
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 Sedro Woolley

These systems are matched to Sedro Woolley, WA. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

4 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.
Skagit County Pud 1 Judy Res
WA5379500
Soft
45 PPMsurface water111,415 servedEstimated — Nearby Data
Anacortes City Of
WA5302200
Soft
45 PPMsurface water21,105 servedEstimated — Nearby Data
Glenhaven Lakes Club
WA5328050
Soft
45 PPMgroundwater1,780 servedHigh Confidence — USGS Monitoring
Hamilton Water Department
WA5330700
Slightly Hard
109 PPMgroundwater540 servedEstimated — Nearby Data

Zip Codes in Sedro Woolley, WA

9828445

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 Sedro Woolley, WA.

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Frequently Asked Questions

How hard is the water in Sedro Woolley, WA?

The citywide weighted average water hardness in Sedro Woolley, WA is 45 PPM (2.6 GPG), classified as soft. This is based on 4 matched water systems.

Do I need a water softener in Sedro Woolley, WA?

At 45 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Sedro Woolley, 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 Sedro Woolley, WA?

Sedro Woolley, Washington is served by 4 matched water systems across 1 zip code.

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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How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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