Water Hardness in Portland, OR

Q: Do I need a water softener in Portland, OR?

At a citywide weighted average of 12 PPM, Portland has relatively soft water. A water softener is generally not necessary.

Q: How many water systems serve Portland, OR?

Portland, Oregon has 23 matched water systems across 26 zip codes.

Oregon · 26 zip codes · 23 matched water systems

12 PPM

0.7 GPG

Soft

0Soft60120180300+

Verified — Annual Water Quality Report

City avg (weighted): 12 PPM

Dataset updated March 9, 202623 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

Portland Water Bureau

OR4100657

Water source: surface water

Serves: 666,200

USGS environmental estimate: 69 PPM

Source context

How this city reading is built

This city reading is a weighted rollup across 23 matched water systems and 26 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

23 verified treated-water sources

23 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 Portland

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

23 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
Portland Water Bureau OR4100657	surface water	12 PPM Soft USGS estimate: 69 PPM	666,200	Verified — Annual Water Quality Report
Tualatin Valley Water District OR4100665	surface water	12 PPM Soft USGS estimate: 69 PPM	224,600	Verified — Annual Water Quality Report
Hillsboro, City Of OR4101513	surface water	12 PPM Soft USGS estimate: 93 PPM	92,632	Verified — Annual Water Quality Report
Beaverton, City Of OR4100081	surface water	12 PPM Soft USGS estimate: 69 PPM	88,045	Verified — Annual Water Quality Report
Gresham, City Of OR4100357	surface water	12 PPM Soft USGS estimate: 51 PPM	73,932	Verified — Annual Water Quality Report

Portland Water Bureau

OR4100657

Soft

12 PPMsurface water666,200 servedVerified — Annual Water Quality Report

Source water: 69 PPM

Tualatin Valley Water District

OR4100665

Soft

12 PPMsurface water224,600 servedVerified — Annual Water Quality Report

Source water: 69 PPM

Hillsboro, City Of

OR4101513

Soft

12 PPMsurface water92,632 servedVerified — Annual Water Quality Report

Source water: 93 PPM

Beaverton, City Of

OR4100081

Soft

12 PPMsurface water88,045 servedVerified — Annual Water Quality Report

Source water: 69 PPM

Gresham, City Of

OR4100357

Soft

12 PPMsurface water73,932 servedVerified — Annual Water Quality Report

Source water: 51 PPM

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

Zip Codes in Portland, OR

9720112 9720212 9720312 9720412 9720512 9720612 9720912 9721012 9721112 9721212 9721312 9721412 9721512 9721612 9721712 9721812 9721912 9722012 9722112 9722712 9722912 9723112 9723212 9723312 9723612 9726612

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 Portland, OR.

Submit Your Data

Frequently Asked Questions

How hard is the water in Portland, OR?

The citywide weighted average water hardness in Portland, OR is 12 PPM (0.7 GPG), classified as soft. This is based on 23 matched water systems.

Do I need a water softener in Portland, OR?

At 12 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Portland, OR 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 Portland, OR?

Portland, Oregon is served by 23 matched water systems across 26 zip codes.

Learn More About Your Water

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