The 12 largest wastewater treatment plants in Utah
Ranked by average flow · 63 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 36.76 million gallons per day. The 12 plants below treat 63 MGD between them, 100% of the flow reported by all 26 plants in the state, and serve about 88,241 people. Every plant links to its profile with permit and compliance data. Treatment technology is shown with a free Klarifi account.
| # | Facility | City | Avg flow (MGD) | Population | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| 1 | Salt Lake City Water Reclamation Plant | Salt Lake City | 36.76 | — | UT0021725 | Dec 2029 | 1 |
| 2 | Central Davis Sd | Kaysville | 10.17 | — | UT0020974 | Apr 2025 | 0 |
| 3 | Spanish Fork City Corporation | Spanish Fork | 5.81 | 58,417 | UT0020109 | Jan 2027 | 99 |
| 4 | Cedar City Regional Wastewater Treatment Facility | Cedar City | 4.28 | — | UT0024970 | Jun 2028 | 0 |
| 5 | Snyderville Basin Water Reclamation District | Park City | 2.61 | 14,131 | UT0020001 | Apr 2031 | 0 |
| 6 | Hyrum City WWTP | Hyrum | 1.28 | — | UT0023205 | Feb 2030 | 6 |
| 7 | Parowan City | Parowan | 0.71 | — | UT0026158 | Jan 2031 | 240 |
| 8 | Jordanelle Special Service District WRF | Heber City | 0.65 | — | UT0025747 | May 2029 | 1 |
| 9 | Morgan City Corporation | Morgan | 0.35 | 4,360 | UT0020893 | Aug 2030 | 3 |
| 10 | Kamas - City Of | Kamas | 0.28 | 2,539 | UT0020966 | Mar 2022 | 0 |
| 11 | Henefer | Henefer | 0.23 | 994 | UT0020192 | Jan 2030 | 12 |
| 12 | Plain City Sewer | Plain City | 0.07 | 7,800 | UT0021326 | Oct 2030 | 9 |
Treatment technology for each plant is shown with a free Klarifi account. Create one →
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 October 26, 2026.
Wastewater terms: WWTP · POTW · MGD · NPDES permit · Activated sludge · Oxidation ditch · 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 12 largest wastewater treatment plants in Utah (2026).” Updated October 26, 2026. https://klarifi.io/facilities/utah/largestNeed a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.