Water Hardness in Tacoma, WA

Q: Do I need a water softener in Tacoma, WA?

At a citywide weighted average of 15 PPM, Tacoma has relatively soft water. A water softener is generally not necessary.

Q: How many water systems serve Tacoma, WA?

Tacoma, Washington has 19 matched water systems across 13 zip codes.

Washington · 13 zip codes · 19 matched water systems

15 PPM

0.9 GPG

Soft

0Soft60120180300+

Verified — Annual Water Quality Report

City avg (weighted): 15 PPM

Dataset updated March 9, 202619 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

Tacoma Water Division City Of

WA5386800

Water source: surface water

Serves: 448,771

USGS environmental estimate: 67 PPM

Source context

How this city reading is built

This city reading is a weighted rollup across 19 matched water systems and 13 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

19 verified treated-water sources

19 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 Tacoma

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

19 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
Tacoma Water Division City Of WA5386800	surface water	15 PPM Soft USGS estimate: 67 PPM	448,771	Verified — Annual Water Quality Report
Southwood WA5382844	surface water	15 PPM Soft USGS estimate: 74 PPM	64,155	Verified — Annual Water Quality Report
Lakewood Water District WA5345550	groundwater	15 PPM Soft USGS estimate: 111 PPM	62,089	Verified — Annual Water Quality Report
Jblm Lewis WA5326050	groundwater	15 PPM Soft USGS estimate: 64 PPM	58,497	Verified — Annual Water Quality Report
Bonney Lake Water Department City WA5307650	surface water	15 PPM Soft USGS estimate: 36 PPM	42,654	Verified — Annual Water Quality Report

Tacoma Water Division City Of

WA5386800

Soft

15 PPMsurface water448,771 servedVerified — Annual Water Quality Report

Source water: 67 PPM

Southwood

WA5382844

Soft

15 PPMsurface water64,155 servedVerified — Annual Water Quality Report

Source water: 74 PPM

Lakewood Water District

WA5345550

Soft

15 PPMgroundwater62,089 servedVerified — Annual Water Quality Report

Source water: 111 PPM

Jblm Lewis

WA5326050

Soft

15 PPMgroundwater58,497 servedVerified — Annual Water Quality Report

Source water: 64 PPM

Bonney Lake Water Department City

WA5307650

Soft

15 PPMsurface water42,654 servedVerified — Annual Water Quality Report

Source water: 36 PPM

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

Zip Codes in Tacoma, WA

9840215 9840315 9840415 9840515 9840615 9840715 9840815 9840915 9842115 9842215 9844315 9846515 9846715

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 Tacoma, WA.

Submit Your Data

Frequently Asked Questions

How hard is the water in Tacoma, WA?

The citywide weighted average water hardness in Tacoma, WA is 15 PPM (0.9 GPG), classified as soft. This is based on 19 matched water systems.

Do I need a water softener in Tacoma, WA?

At 15 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Tacoma, 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 Tacoma, WA?

Tacoma, Washington is served by 19 matched water systems across 13 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.

10 min read

How to Test Water Hardness at Home

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

8 min read