Water Hardness in 98261
Lopez, Washington · San Juan County
Dataset updated March 9, 2026Matched to 11 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 11 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.
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 98261
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.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Fisherman Bay Water Association WA5325547 | groundwater | 289 PPM Very Hard | |
| Mackaye Harbor Water District WA5312911 | groundwater | 289 PPM Very Hard | |
| North Lopez Service WA5360665 | groundwater | 289 PPM Very Hard | |
| Harbor On Fisherman Bay WA5331024 | groundwater | 289 PPM Very Hard | |
| Aleck Bay Park Water System WA5301338 | groundwater | 289 PPM Very Hard |
Nearby Zip Codes
What This Means For You
Use this ZIP 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 Lopez, WA (98261).
Frequently Asked Questions
Is the water hard in Lopez, WA (98261)?
Our estimate for 98261 is 286 PPM (16.7 GPG), but it is based on nearby, county, or state-level data rather than a direct treated tap-water report for this exact location. Confirm with your utility or a home test.
Do I need a water softener in 98261?
Do not size a softener from this estimate alone. Confirm the actual tap-water hardness before choosing treatment equipment.
Is hard water in 98261 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 98261?
Zip code 98261 in Lopez, Washington is served by 11 water systems.
Learn More About Your Water
How to Test Water Hardness at Home
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