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Water Hardness in 98592

Union, Washington · Mason County

48 PPM
2.8 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 25 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 25 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
25 USGS-backed sources
25 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily groundwater
Groundwater commonly picks up calcium and magnesium after contact with rock and soil. 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 Serving 98592

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

25 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.
Shelton City Of
WA5378170
Soft
49 PPMgroundwater17,575 servedHigh Confidence — USGS Monitoring
Alderbrook Water Co
WA5301050
Soft
43 PPMgroundwater2,154 servedHigh Confidence — USGS Monitoring
Union
WA5351920
Soft
43 PPMgroundwater700 servedHigh Confidence — USGS Monitoring
View Ridge Heights
WA5391845
Soft
43 PPMgroundwater271 servedHigh Confidence — USGS Monitoring
Woodland Manor
WA5398184
Soft
43 PPMgroundwater192 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

985844998588499854649985284898524519855549985484698394159834915985028398329159856049

What This Means For You

Recommendations are based on the displayed ZIP 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 Union, WA (98592).

Submit Your Data

Frequently Asked Questions

Is the water hard in Union, WA (98592)?

The average water hardness in 98592 is 48 PPM (2.8 GPG), which is classified as soft.

Do I need a water softener in 98592?

At 48 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 98592 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 98592?

Zip code 98592 in Union, Washington is served by 25 water systems.

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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