What is the largest wastewater treatment plant in Utah?

Salt Lake City Water Reclamation Plant in Salt Lake City, treating an average of 31.1 MGD under NPDES permit UT0021725. Spanish Fork City Corporation in Spanish Fork is second at 5.4 MGD.

How much wastewater do Utah’s largest plants treat?

The 10 largest plants treat 46 MGD combined, 100% of the flow reported by all 26 publicly owned plants in Utah.

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 10 largest wastewater treatment plants in Utah

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

Ranked by average flow · 46 MGD combined · 100% of the state's reported flow

Salt Lake City Water Reclamation Plant in Salt Lake City is the largest publicly owned wastewater treatment plant in Utah by reported average flow, treating about 31.1 million gallons per day. The 10 plants below treat 46 MGD between them, 100% of the flow reported by all 26 plants in the state, and serve about 91,310 people. Every plant links to its profile with permit, technology and compliance data.

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

The 10 largest publicly owned wastewater treatment plants in Utah 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	Salt Lake City Water Reclamation Plant	Salt Lake City	31.1	—	UT0021725	Dec 2029	Clarifiers, Biogas silos	1
2	Spanish Fork City Corporation	Spanish Fork	5.4	58,417	UT0020109	Jan 2027	Clarifiers, Biogas silos	101
3	Cedar City Regional Wastewater Treatment Facility	Cedar City	4.29	—	UT0024970	Jun 2028	Clarifiers, Carrousels / oxidation ditches	0
4	Snyderville Basin Water Reclamation District	Park City	1.8	14,131	UT0020001	Apr 2031	Clarifiers, Carrousels / oxidation ditches, Biogas balloons	0
5	Hyrum City WWTP	Hyrum	0.95	—	UT0023205	Feb 2030	—	6
6	Plain City Sewer	Plain City	0.55	7,800	UT0021326	Oct 2030	—	9
7	Jordanelle Special Service District WRF	Heber City	0.51	—	UT0025747	May 2029	—	1
8	Wellsville City Water System-1mg Gravel Pit Tank Chlorinator	Wellsville	0.5	4,063	UT0020371	May 2030	—	48
9	Morgan City Corporation	Morgan	0.32	4,360	UT0020893	Aug 2030	Aerated lagoons	3
10	Kamas - City Of	Kamas	0.22	2,539	UT0020966	Mar 2022	—	0

Largest plants in Utah: 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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