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Water Hardness in 98555

Lilliwaup, Washington · Mason County

49 PPM
2.9 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 3 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 3 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
3 USGS-backed sources
3 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 98555

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.

3 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
Colony Surf Water Supply
WA5314080
Soft
45 PPMgroundwater285 servedHigh Confidence — USGS Monitoring
Triton Head Assn
WA5389450
Soft
45 PPMgroundwater176 servedHigh Confidence — USGS Monitoring

Nearby Zip Codes

9854846985884998528489838064983201639859248983126498546499852451983836498394159832915

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 Lilliwaup, WA (98555).

Submit Your Data

Frequently Asked Questions

Is the water hard in Lilliwaup, WA (98555)?

The average water hardness in 98555 is 49 PPM (2.9 GPG), which is classified as soft.

Do I need a water softener in 98555?

At 49 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 98555 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 98555?

Zip code 98555 in Lilliwaup, Washington is served by 3 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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