Water Hardness in Lummi Island, WA

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

At a citywide weighted average of 24 PPM, Lummi Island has relatively soft water. A water softener is generally not necessary.

Q: How many water systems serve Lummi Island, WA?

Lummi Island, Washington has 12 matched water systems across 1 zip code.

Washington · 1 zip codes · 12 matched water systems

24 PPM

1.4 GPG

Soft

0Soft60120180300+

Verified — Annual Water Quality Report

City avg (weighted): 24 PPM

Dataset updated March 9, 202612 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading

Bellingham-Water Division City Of

WA5305600

Water source: surface water

Serves: 139,912

USGS environmental estimate: 103 PPM

Source context

How this city reading is built

This city reading is a weighted rollup across 12 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis

9 verified treated-water sources

12 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 Lummi Island

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

12 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
Bellingham-Water Division City Of WA5305600	surface water	24 PPM Soft USGS estimate: 103 PPM	139,912	Verified — Annual Water Quality Report
Ferndale WA5324850	groundwater	24 PPM Soft USGS estimate: 152 PPM	19,305	Verified — Annual Water Quality Report
Lynden Water Department WA5349150	surface water	24 PPM Soft USGS estimate: 99 PPM	17,969	Verified — Annual Water Quality Report
Lwwsd - South Shore Water System WA5395910	surface water	24 PPM Soft USGS estimate: 103 PPM	10,028	Verified — Annual Water Quality Report
Columbia Valley Water District WA5366110	groundwater	24 PPM Soft USGS estimate: 109 PPM	2,648	Verified — Annual Water Quality Report

Bellingham-Water Division City Of

WA5305600

Soft

24 PPMsurface water139,912 servedVerified — Annual Water Quality Report

Source water: 103 PPM

Ferndale

WA5324850

Soft

24 PPMgroundwater19,305 servedVerified — Annual Water Quality Report

Source water: 152 PPM

Lynden Water Department

WA5349150

Soft

24 PPMsurface water17,969 servedVerified — Annual Water Quality Report

Source water: 99 PPM

Lwwsd - South Shore Water System

WA5395910

Soft

24 PPMsurface water10,028 servedVerified — Annual Water Quality Report

Source water: 103 PPM

Columbia Valley Water District

WA5366110

Soft

24 PPMgroundwater2,648 servedVerified — Annual Water Quality Report

Source water: 109 PPM

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

Zip Codes in Lummi Island, WA

9826224

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 Lummi Island, WA.

Submit Your Data

Frequently Asked Questions

How hard is the water in Lummi Island, WA?

The citywide weighted average water hardness in Lummi Island, WA is 24 PPM (1.4 GPG), classified as soft. This is based on 12 matched water systems. The gauge highlights Bellingham-Water Division City Of, a verified treated-water system, because individual systems can differ from the citywide average.

Do I need a water softener in Lummi Island, WA?

At 24 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Lummi Island, 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 Lummi Island, WA?

Lummi Island, Washington is served by 12 matched water systems across 1 zip code.

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