Water Hardness in Gresham, OR

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

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

Q: How many water systems serve Gresham, OR?

Gresham, Oregon has 6 matched water systems across 2 zip codes.

Oregon · 2 zip codes · 6 matched water systems

12 PPM

0.7 GPG

Soft

0Soft60120180300+

Verified — Annual Water Quality Report

City avg (weighted): 12 PPM

Dataset updated March 9, 20266 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 6 matched water systems and 2 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

6 verified treated-water sources

6 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 Gresham

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

6 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
Gresham, City Of OR4100357	surface water	12 PPM Soft USGS estimate: 51 PPM	73,932	Verified — Annual Water Quality Report
Rockwood Pud OR4100668	surface water	12 PPM Soft USGS estimate: 51 PPM	65,443	Verified — Annual Water Quality Report
Troutdale, City Of OR4100901	groundwater	12 PPM Soft USGS estimate: 25 PPM	16,185	Verified — Annual Water Quality Report
Pleasant Home Water District OR4100360	surface water	12 PPM Soft USGS estimate: 51 PPM	1,510	Verified — Annual Water Quality Report

Portland Water Bureau

OR4100657

Soft

12 PPMsurface water666,200 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

Rockwood Pud

OR4100668

Soft

12 PPMsurface water65,443 servedVerified — Annual Water Quality Report

Source water: 51 PPM

Troutdale, City Of

OR4100901

Soft

12 PPMgroundwater16,185 servedVerified — Annual Water Quality Report

Source water: 25 PPM

Pleasant Home Water District

OR4100360

Soft

12 PPMsurface water1,510 servedVerified — Annual Water Quality Report

Source water: 51 PPM

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

Zip Codes in Gresham, OR

9703012 9708012

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 Gresham, OR.

Submit Your Data

Frequently Asked Questions

How hard is the water in Gresham, OR?

The citywide weighted average water hardness in Gresham, OR is 12 PPM (0.7 GPG), classified as soft. This is based on 6 matched water systems.

Do I need a water softener in Gresham, OR?

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

Is hard water in Gresham, 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 Gresham, OR?

Gresham, Oregon is served by 6 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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