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
Is Friday Harbor, WA Water Hard or Soft?
The citywide weighted average water hardness in Friday Harbor, WA is 130 PPM (7.6 GPG), classified as moderately hard. Individual systems, ZIP codes, and private wells can differ.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
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
Use this city reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.
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
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 readHard Water vs Soft Water: Key Differences
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10 min readPPM to GPG Converter + Water Hardness Scale Explained
Convert between PPM and GPG instantly. Understand the USGS water hardness scale and what your numbers mean for your home.
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