How hard is the water in Anchorage, AK?
Calculated from the utility's calcium and magnesium results · March 2025
- AK typical
- 110 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Calculated from utility data
Tap water in Anchorage has about 110 mg/L of hardness, which is 6.4 grains per gallon. On the USGS scale that counts as moderately hard. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (March 2025).
At 110 mg/L, Anchorage is close to the typical Alaska figure of 110 mg/L. None of the 2 nearest cities we track has softer water. The range nearby runs from 110 mg/L in Fairbanks to 123 in Wasilla.
What 110 mg/L means at home
You may see faint white spots on glasses and shower doors after the water dries.
Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
Optional. Plenty of households at this level live with it and descale the kettle now and then.
Water softener
Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.
Carbon filter
Improves taste and removes chlorine. It leaves calcium and magnesium in place.
3 people × 75 gallons a day × 6.4 gpg = 1,447 grains a day. A 24,000-grain unit regenerates about every 16 days.
EPA record for Anchorage's water system
No health-based violations since 2016
Serves about 221,351 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 9
- Open now
- 0
EPA lists this system as serving Anchorage.
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Anchorage water hard?
Somewhat. It measures about 110 mg/L (6.4 grains per gallon), which the USGS classes as moderately hard.
What is the water hardness in Anchorage in grains per gallon?
About 6.4 gpg. One grain per gallon equals 17.1 mg/L, so 110 mg/L divided by 17.1 gives 6.4.
What size water softener do I need in Anchorage?
For 3 people using 75 gallons each per day, 6.4 gpg works out to about 1,447 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.
Has the Anchorage water system had EPA violations?
EPA records show no health-based violations for Moa Municipality of Anchorage since 2016. There were also 9 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
Hardness data: TapWaterData US Water Hardness (calculated from utility data, March 22, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.