How many public water systems are in Alaska?

Alaska has 1,321 active public water systems in EPA SDWIS records, including 405 community water systems. Together they report serving 864.3K people.

What is the largest water system in Alaska?

Moa Municipality of Anchorage is the largest active public water system in Alaska, serving a reported 221,351 people.

Does Alaska rely more on groundwater or surface water?

83.4% of Alaska's active public water systems draw primarily on groundwater and 16.6% on surface water (including purchased supplies).

Alaska public water systems

1,321 active systems regulated under the Safe Drinking Water Act, serving a reported 864.3K people across 25 counties.

Dataset updated July 2026 . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

1,321

Population served

864.3K

Community systems

405

Groundwater share

83.4%

System types in Alaska

405

Community water system

228

Non-transient non-community water system

688

Transient non-community water system

Largest water systems in Alaska

The largest active public water systems in Alaska by population served
#	Water system	County	Population served	Type	Source
1	Moa Municipality of Anchorage	Anchorage Municipality	221,351	Community	Surface water
2	Golden Heart Utilities	Fairbanks North Star Borough	78,324	Community	Groundwater
3	City and Borough of Juneau	Juneau City and Borough	38,526	Community	Surface water
4	Jber-Elmendorf	Anchorage Municipality	30,003	Community	Purchased surface water
5	College Utilities Corporation	Fairbanks North Star Borough	27,000	Community	Purchased groundwater
6	Doyon Utilities Jber - Richardson	Anchorage Municipality	20,284	Community	Surface water
7	Ft Wainwright - Main Post	Fairbanks North Star Borough	20,076	Community	Groundwater
8	Wasilla Water System	Matanuska-Susitna Borough	18,492	Community	Groundwater
9	Eielson - Air Force Base	Fairbanks North Star Borough	11,870	Community	Groundwater
10	Skagway	—	10,947	Community	Groundwater
11	Kodiak Water System	Kodiak Island Borough	9,547	Community	Surface water
12	Sitka	Sitka City and Borough	9,448	Community	Surface water
13	Unalaska Water System	Aleutians West Census Area	9,400	Community	Surface water
14	Ketchikan Public Utilities	Ketchikan Gateway Borough	8,937	Community	Surface water
15	Palmer Water System	Matanuska-Susitna Borough	8,111	Community	Groundwater
16	Homer Water System	Kenai Peninsula Borough	7,008	Community	Surface water
17	University of Alaska - Fairbanks	Fairbanks North Star Borough	6,200	Community	Purchased groundwater
18	Kenai Water System	Kenai Peninsula Borough	5,700	Community	Groundwater
19	Barrow Utilities & Elec. Coop., Inc.. (Bu	North Slope Borough	4,900	Community	Surface water
20	Soldotna	Kenai Peninsula Borough	4,807	Community	Groundwater
21	Denali - Main / Front Country	Denali Borough	4,741	Non-transient non-community	Surface water
22	Valdez Water System - Main	Valdez-Cordova Census Area	4,500	Community	Groundwater
23	North Pole Utilities	Fairbanks North Star Borough	4,005	Community	Groundwater
24	Nome Joint Utility System	Nome Census Area	3,920	Community	Groundwater
25	Seward	Kenai Peninsula Borough	3,324	Community	Groundwater

Alaska public water systems

System types in Alaska

Largest water systems in Alaska

By county