Water Hardness in 99921
Craig, Alaska · Prince Of Wales-Outer Ketchikan Census County
Based on EPA and USGS water quality monitoring data from environmental sources (wells, streams, aquifers) near your water system. Actual tap water may differ after treatment. Dataset updated March 9, 2026. See how we calculate this estimate; for precise results, test your water at home.
Our Estimate
Weighted average from 1 water system.
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 Craig, AK (99921).
Water Systems Serving 99921
Nearby Zip Codes
Frequently Asked Questions
Is the water hard in Craig, AK (99921)?
The average water hardness in 99921 is 12 PPM (0.7 GPG), which is classified as soft.
Do I need a water softener in 99921?
At 12 PPM, your water is relatively soft. A water softener is generally not necessary.
How many water systems serve 99921?
Zip code 99921 in Craig, Alaska is served by 1 water system.
Learn More About Your Water
Water Hardness Scale: PPM and GPG Chart
Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.
10 min readHow 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 read