Wastewater Treatment Plants in Utah
26 facilities · 46 MGD combined flow
Klarifi tracks 26 publicly owned wastewater treatment plants in Utah with a combined average flow of 46 MGD, serving about 153,127 residents. 4 plants treat more than 1 MGD and 1 more than 10 MGD; 11 use lagoon systems and 8 have digesters or biogas infrastructure. The largest is Salt Lake City Water Reclamation Plant in Salt Lake City at 31.1 MGD. 1 NPDES permits expire this year and 1 next year.
Every plant below links to a profile with average and design flow, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city.
26 plant locations in Utah; dot size follows average flow.
NPDES permits and renewals in Utah
Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.
Largest wastewater treatment plants in Utah
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Salt Lake City Water Reclamation Plant | Salt Lake City | 31.1 | 56 | UT0021725 | Dec 2029 | Clarifiers, Biogas silos | 1 |
| Spanish Fork City Corporation | Spanish Fork | 5.4 | 5 | UT0020109 | Jan 2027 | Clarifiers, Biogas silos | 101 |
| Cedar City Regional Wastewater Treatment Facility | Cedar City | 4.29 | 4.4 | UT0024970 | Jun 2028 | Clarifiers, Carrousels / oxidation ditches | 0 |
| Snyderville Basin Water Reclamation District | Park City | 1.8 | 4 | UT0020001 | Apr 2031 | Clarifiers, Carrousels / oxidation ditches, Biogas balloons | 0 |
| Hyrum City WWTP | Hyrum | 0.95 | 2 | UT0023205 | Feb 2030 | — | 6 |
| Plain City Sewer | Plain City | 0.55 | 0.9 | UT0021326 | Oct 2030 | — | 9 |
| Jordanelle Special Service District WRF | Heber City | 0.51 | 1 | UT0025747 | May 2029 | — | 1 |
| Wellsville City Water System-1mg Gravel Pit Tank Chlorinator | Wellsville | 0.5 | 0.68 | UT0020371 | May 2030 | — | 48 |
| Morgan City Corporation | Morgan | 0.32 | 0.45 | UT0020893 | Aug 2030 | Aerated lagoons | 3 |
| Kamas - City Of | Kamas | 0.22 | 1 | UT0020966 | Mar 2022 | — | 0 |
| Ashley Valley Water & Sewer Imp Dist | Vernal | — | 4.7 | UT0025348 | Nov 2021 | Carrousels / oxidation ditches, Biogas balloons | 1 |
| Brigham City Corporation Waste Water | Brigham City | — | 6 | UT0022365 | Apr 2030 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 1 |
| Central Weber Sewer Improvement District | Ogden | — | 45 | UT0021911 | Jul 2030 | Clarifiers, Biogas silos, Biogas balloons | 4 |
| Duchesne City WWTP | Duchesne | — | 0.42 | UT0020095 | Oct 2029 | Uncovered lagoons | 0 |
| Eureka | Eureka | — | 0.2 | UT0024601 | Jan 2025 | Uncovered lagoons | 179 |
| Grantsville City | Grantsville | — | 1.5 | UT0021130 | Mar 2029 | Uncovered lagoons | 12 |
| Henefer | Henefer | — | 0.35 | UT0020192 | Jan 2030 | Uncovered lagoons | 12 |
| Lewiston City | Lewiston | — | 0.11 | UT0020214 | Jul 2028 | Uncovered lagoons | 5 |
| Little Mountain Service Area | Ogden | — | 0.25 | UT0025569 | Nov 2029 | Uncovered lagoons | 0 |
| Magna Water District WWTP | Magna | — | 3.3 | UT0021440 | Mar 2029 | Clarifiers, Carrousels / oxidation ditches, Biogas silos | 0 |
| Manti City Lagoons | Manti | — | 0.33 | UT0026026 | Jan 2022 | Uncovered lagoons | 0 |
| Orem City Corporation | Orem | — | 13.5 | UT0020915 | Mar 2031 | Clarifiers, Carrousels / oxidation ditches, Biogas silos | 2 |
| Salem City Water Reclamation Facility | Salem | — | 1.5 | UT0026085 | Mar 2029 | Clarifiers, Carrousels / oxidation ditches | 2 |
| South Davis Sewer Improvement District South Plant | North Salt Lake | — | 4.3 | UT0021628 | Dec 2026 | Clarifiers, Aerated lagoons, Biogas silos, Biogas balloons | 1 |
| Stansbury Park Wastewater | Stansbury Park | — | 1.5 | UT0025241 | Apr 2028 | Aerated lagoons, Uncovered lagoons | 33 |
Utah plants by treatment technology
All 26 plants in Utah
Wastewater treatment 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.