What is the largest wastewater treatment plant in Alaska?

Golden Heart Utilities WWTP in Fairbanks, treating an average of 4.69 MGD under NPDES permit AK0023451. Mendenhall Valley WWTP in Juneau is second at 2.15 MGD.

How much wastewater do Alaska’s largest plants treat?

The 32 largest plants treat 17 MGD combined, 100% of the flow reported by all 36 publicly owned plants in Alaska.

How is plant size measured?

By reported average daily flow in million gallons per day (MGD) from EPA discharge monitoring reports, the standard measure of a plant’s size. Design capacity, the flow a plant is permitted to treat, is usually higher and is shown on each profile.

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The 32 largest wastewater treatment plants in Alaska

Name: Largest wastewater treatment plants in Alaska
Creator: Klarifi
License: https://klarifi.io/terms-of-service

Ranked by average flow · 17 MGD combined · 100% of the state's reported flow

Golden Heart Utilities WWTP in Fairbanks is the largest publicly owned wastewater treatment plant in Alaska by reported average flow, treating about 4.69 million gallons per day. The 32 plants below treat 17 MGD between them, 100% of the flow reported by all 36 plants in the state, and serve about 147,551 people. Every plant links to its profile with permit and compliance data. Treatment technology is shown with a free Klarifi account.

All plants in Alaska →The 50 largest US plants →Alaska NPDES permits →

The 32 largest publicly owned wastewater treatment plants in Alaska by average flow (MGD), with population served, NPDES permit, expiry and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Violations (3y)
1	Golden Heart Utilities WWTP	Fairbanks	4.69	35,073	AK0023451	Dec 2026	1
2	Mendenhall Valley WWTP	Juneau	2.15	18,158	AK0022951	May 2025	63
3	Kodiak Wastewater Treatment Facility	Kodiak	1.78	5,572	AK0021555	May 2029	2
4	Charcoal Point WWTP	Ketchikan	1.61	10,874	AK0021440	Oct 2030	10
5	Eagle River WWTP	Eagle River	1.39	27,333	AK0022543	Jan 2031	1
6	Juneau Douglas Wastewater Treatment Plant	Juneau	0.96	12,311	AK0023213	Feb 2026	25
7	Palmer WWTP	Palmer	0.7	8,000	AK0022497	Feb 2030	11
8	Mountain Point Wastewater Treatment Plant	Ketchikan	0.48	2,758	AKG572028	Dec 2027	21
9	Girdwood WWTP	Girdwood	0.47	2,308	AK0047856	Oct 2005	6
10	Lowell Point WWTP	Seward	0.45	2,830	AK0021890	Sep 2027	19
11	Kenai STP	Kenai	0.44	4,000	AK0021377	May 2026	1
12	Homer Public Works Department And WWTP	Homer	0.44	4,000	AK0021245	Jan 2027	8
13	Petersburg WWTP	Petersburg	0.43	3,198	AK0021458	Oct 2030	5
14	Metlakatla Sewer Treatment Plant	Metlakatla	0.23	1,454	AK0053813	Sep 2025	102
15	Thorne Bay WWTF	Thorne Bay	0.22	348	AKG572045	Dec 2027	246
16	Skagway WWTP	Skagway	0.21	884	AK0020010	Oct 2030	120
17	Dillingham WWTP	Dillingham	0.18	2,438	AKG573004	Aug 2028	99
18	North Pole WWTP	North Pole	0.17	1,800	AK0021393	May 2013	4
19	Talkeetna Sewage Treatment Lagoons	Talkeetna	0.12	450	AKG573033	Aug 2028	0
20	Auke Bay Wastewater Treatment Facility	Juneau	0.05	1,000	AKG572004	Dec 2027	12
21	Seldovia Water System	Seldovia	0.05	—	AKG380006	Sep 2029	102
22	Nenana WWTF	Nenana	0.04	358	AKG572031	Dec 2027	90
23	King Salmon WWTF	King Salmon	0.04	—	AKG573029	Aug 2028	56
24	Saint Marys WWTF	Saint Marys	0.03	599	AKG573016	Aug 2028	0
25	Kaktovik WWTF	Kaktovik	0.03	283	AKG573038	Aug 2028	105
26	Point Hope WWTF	Point Hope	0.02	830	AKG571056	Jul 2009	207
27	Nuiqsut WWTF	Nuiqsut	0.02	416	AKG572033	Dec 2027	44
28	Atqasuk WWTF	Atqasuk	0.01	276	AKG572001	Dec 2027	86
29	Point Lay WWTF	Point Lay	0.0076	—	AKG572036	Dec 2027	134
30	Kisimgiugtuq School Wastewater Treatment Facility	Kivalina	0.0052	—	AKG572130	Dec 2027	354
31	Mcneil Canyon Elementary School	Homer	0.00035	—	AKG572027	Dec 2027	6
32	Waterfall Creek WWTP	Ketchikan	0.00000022	—	AKG571038	Jul 2009	425

Treatment technology for each plant is shown with a free Klarifi account. Create one →

Largest plants in Alaska: questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed October 26, 2026.

Wastewater terms: WWTP · POTW · MGD · NPDES permit · Centrate · Ozonation · all terms

Cite this page

Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.

Klarifi. “The 32 largest wastewater treatment plants in Alaska (2026).” Updated October 26, 2026. https://klarifi.io/facilities/alaska/largest

Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.

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