Water Hardness in 98010
Black Diamond, Washington · King County
Based on treated water data from the utility's Consumer Confidence Report (CCR) — the annual water quality report your provider is required to publish.
Our Estimate
Weighted average from 25 water systems.
What This Means For You
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 Black Diamond, WA (98010).
Water Systems Serving 98010
Nearby Zip Codes
Frequently Asked Questions
Is the water hard in Black Diamond, WA (98010)?
The average water hardness in 98010 is 22 PPM (1.3 GPG), which is classified as soft.
Do I need a water softener in 98010?
At 22 PPM, your water is relatively soft. A water softener is generally not necessary.
How many water systems serve 98010?
Zip code 98010 in Black Diamond, Washington is served by 25 water systems.
Learn More About Your Water
Water Hardness Scale: What PPM Means & When It Matters
Understand the USGS hardness scale, convert between PPM and GPG, and see real city examples at every hardness level.
10 min readHow to Test Water Hardness at Home (Free + DIY + Kit Methods)
From free online lookups to test strips and lab testing - every way to find out how hard your water is.
8 min read