What is the largest wastewater treatment plant in Alaska?

Charcoal Point WWTP in Ketchikan, treating an average of 5.09 MGD under NPDES permit AK0021440. Golden Heart Utilities WWTP in Fairbanks is second at 4.9 MGD.

How much wastewater do Alaska’s largest plants treat?

The 33 largest plants treat 22 MGD combined, 100% of the flow reported by all 38 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 33 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 · 22 MGD combined · 100% of the state's reported flow

Charcoal Point WWTP in Ketchikan is the largest publicly owned wastewater treatment plant in Alaska by reported average flow, treating about 5.09 million gallons per day. The 33 plants below treat 22 MGD between them, 100% of the flow reported by all 38 plants in the state, and serve about 143,149 people. Every plant links to its profile with permit, technology and compliance data.

All plants in Alaska →The 100 largest US plants →Alaska NPDES permits →

The 33 largest publicly owned wastewater treatment plants in Alaska by average flow (MGD), with population served, NPDES permit, expiry, treatment technology and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Technology	Violations (3y)
1	Charcoal Point WWTP	Ketchikan	5.09	10,874	AK0021440	Oct 2030	—	10
2	Golden Heart Utilities WWTP	Fairbanks	4.9	35,073	AK0023451	Dec 2026	—	1
3	Mendenhall Valley WWTP	Juneau	2.44	18,158	AK0022951	May 2025	—	59
4	Kodiak Wastewater Treatment Facility	Kodiak	1.5	5,572	AK0021555	May 2029	Clarifiers, Biogas balloons	2
5	Eagle River WWTP	Eagle River	1.38	27,333	AK0022543	Jan 2031	—	0
6	Sitka Wastewater Facility	Sitka	1.1	8,207	AK0021474	Oct 2030	—	4
7	Palmer WWTP	Palmer	0.63	8,000	AK0022497	Feb 2030	—	14
8	Lowell Point WWTP	Seward	0.58	2,830	AK0021890	Sep 2027	Aerated lagoons	17
9	Petersburg WWTP	Petersburg	0.56	3,198	AK0021458	Oct 2030	—	3
10	Mountain Point Wastewater Treatment Plant	Ketchikan	0.55	2,758	AKG572028	Dec 2027	—	21
11	Kenai STP	Kenai	0.43	4,000	AK0021377	May 2026	Biogas silos, Biogas balloons	1
12	Girdwood WWTP	Girdwood	0.39	2,308	AK0047856	Oct 2005	—	6
13	Homer Public Works Department And WWTP	Homer	0.38	4,000	AK0021245	Jan 2027	—	8
14	Cordova Wastewater Treatment Plant	Cordova	0.29	2,140	AK0021547	Feb 2028	—	2
15	Thorne Bay WWTF	Thorne Bay	0.27	348	AKG572045	Dec 2027	—	246
16	Skagway WWTP	Skagway	0.25	884	AK0020010	Oct 2030	—	116
17	Metlakatla Sewer Treatment Plant	Metlakatla	0.23	1,454	AK0053813	Sep 2025	—	105
18	North Pole WWTP	North Pole	0.16	1,800	AK0021393	May 2013	—	4
19	Spring Creek Correctional Center	Seward	0.09	—	AK0053724	Apr 2027	—	67
20	Auke Bay Wastewater Treatment Facility	Juneau	0.08	1,000	AKG572004	Dec 2027	—	12
21	Nenana WWTF	Nenana	0.06	358	AKG572031	Dec 2027	—	91
22	Talkeetna Sewage Treatment Lagoons	Talkeetna	0.06	450	AKG573033	Aug 2028	Uncovered lagoons	0
23	King Salmon WWTF	King Salmon	0.04	—	AKG573029	Aug 2028	—	53
24	Seldovia Water System	Seldovia	0.03	—	AKG380006	Sep 2029	—	91
25	Point Hope WWTF	Point Hope	0.03	830	AKG571056	Jul 2009	—	211
26	Saint Marys WWTF	Saint Marys	0.03	599	AKG573016	Aug 2028	—	0
27	Nuiqsut WWTF	Nuiqsut	0.02	416	AKG572033	Dec 2027	—	34
28	Kaktovik WWTF	Kaktovik	0.01	283	AKG573038	Aug 2028	—	101
29	Atqasuk WWTF	Atqasuk	0.01	276	AKG572001	Dec 2027	—	84
30	Point Lay WWTF	Point Lay	0.01	—	AKG572036	Dec 2027	—	139
31	Kisimgiugtuq School Wastewater Treatment Facility	Kivalina	0.0035	—	AKG572130	Dec 2027	—	371
32	Mcneil Canyon Elementary School	Homer	0.00038	—	AKG572027	Dec 2027	—	6
33	Waterfall Creek WWTP	Ketchikan	0.00000021	—	AKG571038	Jul 2009	—	424

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 September 11, 2026.

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