Why does water hardness vary across Alaska?

Water hardness varies across Alaska because utilities can use different groundwater wells, reservoirs, treatment plants, blends, and distribution zones. Private wells can also differ from nearby municipal water.

What city in Alaska has the hardest water?

North Pole has the hardest water among higher-confidence Alaska city pages at 71 PPM. Check the city page for local systems and ZIP codes before making treatment decisions.

Does this include municipal water, well water, or both?

The state report combines public water system records, utility reports, and USGS monitoring where available. Municipal treated-water records are preferred when present. Private well hardness can vary at the address level and should be confirmed with a local test.

How many water systems are in Alaska?

Alaska has 405 active community water systems serving 222 cities.

Water Hardness in Alaska

Average: 71 PPMSlightly Hard222 cities405 water systems

State report

Is Alaska Water Hard or Soft?

Alaska water is slightly hard on average at 71 PPM (4.2 GPG). Local readings can vary by utility, aquifer, treatment plant, and private well use.

State average

71 PPM

Slightly Hard

Local coverage

222 cities

405 water systems

Source profile

50 ZIPs

direct or USGS-backed

79% of covered ZIPs use nearby, county, or state estimates, so confirm local readings before sizing treatment equipment.

Methodology Data sources Search by ZIP code

State data profile

How to read the Alaska results

State pages are screening and comparison hubs. They summarize ZIP, city, and water-system patterns so you can find the local page that best matches your home or utility.

Direct or USGS-backed ZIPs

50 of 237

21% use treated-water records or USGS monitoring.

Estimated ZIP values

187 ZIPs

79% use nearby, county, or state-level fallback values.

Dataset update

March 9, 2026

Source coverage and rollups are rebuilt from the public dataset.

Use the source coverage below to judge how much local confirmation a specific city or ZIP needs. The methodology page explains the source hierarchy, weighting, and limitations.

State Average

71 PPM

Slightly Hard

Coverage

222 cities

405 water systems in the state rollup.

Data Source Coverage

ZIP-level source mix for Alaska; higher direct and USGS coverage means less reliance on regional estimates.

237 ZIPs covered

Verified treated water

Utility, CCR, or state treated-water records

16%

37 ZIPs

High-confidence USGS

Environmental monitoring matched to local systems

13 ZIPs

Estimated

Nearby, county, or state-level fallback values

79%

187 ZIPs

In Alaska, 16% of ZIPs use verified treated-water records, 5% use high-confidence USGS monitoring, and 79% use estimates that should be confirmed locally for treatment decisions.

What the Data Shows in Alaska

Most classified ZIPs in Alaska are below the hard-water threshold, though local systems can still vary.

Alaska relies heavily on nearby, county, or state estimates: 79% of ZIPs use fallback values, so local testing matters more here than in states with stronger direct coverage.

Use the city table below to compare local results. For estimated locations or unusually high readings, confirm with your utility or a home hardness test before sizing treatment equipment.

ZIP Hardness Distribution

Soft45% (106)

Slightly Hard49% (117)

Moderately Hard5% (12)

Hard1% (2)

Very Hard0% (0)

Treatment Takeaway

Hardness treatment is less likely to be needed statewide, but local water systems can still differ from the state pattern. Test first if you see scale or spotting.

How to Use This Data

Because estimated ZIP values are common in Alaska, use this page for screening and compare against a utility report or home test before buying equipment.

Source-Backed Water Systems in Alaska

Large systems with treated-water reports or USGS monitoring behind the state rollup.

Review source labels

Water system	Hardness	Source label	Population
Moa Municipality Of Anchorage AK2210906 - Anchorage Municipality County	30 PPM Soft	Annual Water Quality Report Verified - Annual Water Quality Report	221,351
Golden Heart Utilities AK2310730 - Fairbanks North Star Borough County	70 PPM Slightly Hard	Annual Water Quality Report Verified - Annual Water Quality Report	78,324
City And Borough Of Juneau AK2110342 - Juneau City And Borough County	10 PPM Soft	Annual Water Quality Report Verified - Annual Water Quality Report	38,526
College Utilities Corporation AK2310900 - Fairbanks North Star Borough County	70 PPM Slightly Hard	Annual Water Quality Report Verified - Annual Water Quality Report	27,000
Ft Wainwright - Main Post AK2310918 - Fairbanks North Star Borough County	70 PPM Slightly Hard	Annual Water Quality Report Verified - Annual Water Quality Report	20,076
Wasilla Water System AK2224646 - Matanuska-Susitna Borough County	30 PPM Soft	Annual Water Quality Report Verified - Annual Water Quality Report	18,492
University Of Alaska - Fairbanks AK2310683 - Fairbanks North Star Borough County	70 PPM Slightly Hard	Annual Water Quality Report Verified - Annual Water Quality Report	6,200
H2O 2U, Dba The Fill AK2314653 - Fairbanks North Star Borough County	70 PPM Slightly Hard	Annual Water Quality Report Verified - Annual Water Quality Report	2,400

Useful Alaska City Pages

Shortcuts to city pages backed by more ZIP-code or water-system data.

Cities With More Local Data

Slightly Hard (70 PPM)

Prioritize cities with multiple ZIPs and systems, then use source badges on each city page to separate verified treated-water records from estimates.

Top 10 Hardest Water Cities

#	City	Hardness
1	North Pole	Slightly Hard (71 PPM)
2	Fairbanks	Slightly Hard (70 PPM)
3	Butte	Soft (51 PPM)
4	Wasilla	Soft (43 PPM)
5	Big Lake	Soft (33 PPM)
6	Anchorage	Soft (30 PPM)

Top 10 Softest Water Cities

#	City	Hardness
1	Anchorage	Soft (30 PPM)
2	Big Lake	Soft (33 PPM)
3	Wasilla	Soft (43 PPM)
4	Butte	Soft (51 PPM)
5	Fairbanks	Slightly Hard (70 PPM)
6	North Pole	Slightly Hard (71 PPM)

All Cities in Alaska

City pages marked Estimated use fallback values and should be confirmed with local testing or utility data.

AkhiokSlightly Hard AkiachakSoft AkiakSoft AkutanSlightly Hard AlakanukModerately Hard AleknagikSlightly Hard AllakaketSlightly Hard AmblerSlightly Hard Anaktuvuk PassSlightly Hard AnchorageSoft AndersonSlightly Hard AngoonSlightly Hard AnvikSlightly Hard Arctic VillageSlightly Hard AtkaSoft AtmautluakSlightly Hard AtqasukSoft BarrowSoft BeaverSlightly Hard Bettles FieldSlightly Hard Big LakeSoft BorderSlightly Hard Brevig MissionSoft BucklandSlightly Hard ButteSoft CantwellSlightly Hard CentralSlightly Hard ChalkyitsikSlightly Hard ChefornakSoft Chenega BaySlightly Hard ChevakSoft ChickaloonSoft ChickenSlightly Hard ChignikSoft Chignik LagoonSoft Chignik LakeSoft ChitinaSlightly Hard ChuathbalukSoft ChugiakHard CircleSlightly Hard Clam GulchSoft Clarks PointSlightly Hard ClearSlightly Hard Coffman CoveSoft ColdfootSlightly Hard Cooper LandingSoft Copper CenterSlightly Hard CraigSoft Crooked CreekSlightly Hard DeeringSlightly Hard Denali NationalSlightly Hard Dot LakeSlightly Hard DouglasSoft Dutch HarborSoft EagleSlightly Hard Eagle RiverModerately Hard EekSoft EgegikSoft Eielson AfbSlightly Hard EkwokSlightly Hard Elfin CoveSlightly Hard ElimSlightly Hard Elmendorf AfbSoft EmmonakModerately Hard EsterSlightly Hard FairbanksSlightly Hard False PassSlightly Hard Fort RichardsonSlightly Hard Fort WainwrightSlightly Hard Fort YukonSlightly Hard GalenaSlightly Hard GambellSlightly Hard GirdwoodSlightly Hard GlennallenSlightly Hard GolovinSlightly Hard Goodnews BaySoft GraylingSlightly Hard GustavusSoft HainesSlightly Hard HealySlightly Hard Holy CrossSlightly Hard HoonahSlightly Hard Hooper BayModerately Hard HopeSoft HoustonSoft HughesSlightly Hard HusliaSlightly Hard HydaburgSoft HyderSoft IgiugigSoft IndianSoft JuneauSoft KakeSoft KaktovikSlightly Hard KalskagSoft KaltagSlightly Hard KarlukSlightly Hard KasiglukSlightly Hard KasilofSoft KenaiSlightly Hard KetchikanSoft KianaSlightly Hard King CoveSlightly Hard KipnukSoft KivalinaSlightly Hard KlawockSoft KobukSlightly Hard KokhanokSoft KoliganekSlightly Hard KotlikSoft KotzebueSlightly Hard KoyukSlightly Hard KoyukukSlightly Hard KwethlukSoft KwigillingokSoft Lake MinchuminaModerately Hard Larsen BaySlightly Hard LevelockSlightly Hard Lower KalskagSoft Manley Hot SprinSoft ManokotakSlightly Hard MarshallModerately Hard Mc GrathSlightly Hard MekoryukSoft MetlakatlaSoft Meyers ChuckSoft MintoSlightly Hard Moose PassSoft Mountain VillageModerately Hard NaknekSlightly Hard NapakiakSoft Nelson LagoonSlightly Hard NenanaSlightly Hard New StuyahokSlightly Hard NightmuteSoft NikiskiSoft NikolaevskSoft NikolaiSlightly Hard NikolskiSoft NinilchikSoft NoatakSlightly Hard NondaltonSoft NoorvikSlightly Hard North PoleSlightly Hard NorthwaySlightly Hard NuiqsutSoft NulatoSlightly Hard NunapitchukSlightly Hard Old HarborSlightly Hard OuzinkieSlightly Hard Pedro BaySoft PelicanSlightly Hard PerryvilleSoft PetersburgSoft Pilot PointSoft Pilot StationModerately Hard PlatinumSoft Point BakerSoft Point HopeSlightly Hard Point LaySlightly Hard Port AlsworthSoft Port GrahamSoft Port HeidenSoft Port LionsSlightly Hard QuinhagakSoft RampartSlightly Hard Red DevilSoft RubySlightly Hard Russian MissionSoft Saint George IslSoft Saint MarysModerately Hard Saint MichaelSlightly Hard Saint Paul IslanSoft SalchaSlightly Hard Sand PointSlightly Hard SavoongaSlightly Hard Scammon BayModerately Hard SelawikSlightly Hard SeldoviaSoft SewardModerately Hard ShagelukSlightly Hard ShaktoolikSlightly Hard Sheldon PointSoft ShishmarefSoft ShungnakSlightly Hard SitkaSoft SkagwaySoft SkwentnaSoft SlanaSlightly Hard SleetmuteSoft SoldotnaSlightly Hard South NaknekSoft StebbinsSlightly Hard SterlingSlightly Hard Stevens VillageSlightly Hard TakotnaSlightly Hard TalkeetnaSoft TanacrossSlightly Hard TananaModerately Hard TatitlekSlightly Hard TellerSoft Tenakee SpringsSoft Thorne BaySoft TogiakSlightly Hard Toksook BaySoft Trapper CreekSoft TuluksakSoft TuntutuliakSoft TununakSoft TyonekSlightly Hard UnalakleetSlightly Hard UnalaskaSoft ValdezSlightly Hard VenetieSlightly Hard WainwrightSoft WalesSlightly Hard WasillaSoft White MountainSlightly Hard WhittierHard WillowSoft WrangellSlightly Hard YakutatSlightly Hard