Water Hardness in Friday Harbor, WA
Washington · 1 zip codes · 18 matched water systems
Dataset updated March 9, 202618 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
How this city reading is built
This city reading is a weighted rollup across 18 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
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 Friday Harbor
These systems are matched to Friday Harbor, WA. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
Friday Harbor Town Of WA5326595 | surface water | 103 PPM Slightly Hard | |
Roche Harbor Water System Inc WA5373230 | surface water | 103 PPM Slightly Hard | |
Cape San Juan Water District WA5311065 | groundwater | 289 PPM Very Hard | |
Oaks The Mobile Home Park WA5387780 | groundwater | 289 PPM Very Hard | |
Portland Fair Estates WA5369008 | groundwater | 289 PPM Very Hard |
Zip Codes in Friday Harbor, WA
What This Means For You
Recommendations are based on the displayed hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Moderately Hard Water
Your water is moderately hard. You're likely seeing scale buildup on fixtures, spotty dishes, and may notice dry skin or hair. A water softener or conditioner can help.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How to Test Your 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 Friday Harbor, WA.
Frequently Asked Questions
How hard is the water in Friday Harbor, WA?
The citywide weighted average water hardness in Friday Harbor, WA is 130 PPM (7.6 GPG), classified as moderately hard. This is based on 18 matched water systems.
Do I need a water softener in Friday Harbor, WA?
With a citywide average hardness of 130 PPM, a water softener is worth considering for homes in Friday Harbor. Confirm your tap reading before sizing equipment.
Is hard water in Friday Harbor, 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 Friday Harbor, WA?
Friday Harbor, Washington is served by 18 matched water systems across 1 zip code.
Learn More About Your Water
Do You Need a Water Softener? (Based on Your Water Hardness)
A data-driven guide to help you decide if a water softener is worth the investment based on your actual water hardness level.
10 min readSalt-Based vs Salt-Free Water Softener: Which Do You Need?
Salt-based softeners remove hardness minerals. Salt-free conditioners prevent scale but don't soften. Here's how to choose based on your water hardness level.
10 min readBest Shower Filters for Hard Water (2026 Reviews)
We tested KDF, Vitamin C, and carbon shower filters for hard water. Here are the filters that actually reduce mineral buildup on hair and skin.
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