Wastewater treatment plants in North Dakota
200 facilities · 53 MGD combined flow
Klarifi tracks 200 publicly owned wastewater treatment plants in North Dakota with a combined average flow of 53 MGD, serving about 538,191 residents. 10 plants treat more than 1 MGD and 1 more than 10 MGD; 194 use lagoon systems and 3 have digesters or biogas infrastructure. The largest is Grand Forks City Of in Grand Forks at 12.26 MGD. 0 NPDES permits expire this year and 19 next year.
Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account.
200 plant locations in North Dakota; dot size follows average flow. Boundaries: U.S. Census Bureau.
NPDES permits and renewals in North Dakota
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 North Dakota
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| Grand Forks City Of | Grand Forks | 12.26 | 40.71 | ND0022888 | Dec 2028 | 7 |
| Wahpeton City Of | Wahpeton | 8.29 | — | ND0020320 | Sep 2031 | 5 |
| Bismarck City Of (potw) | Bismarck | 7.34 | 10.68 | ND0023434 | Jun 2028 | 0 |
| City Of Minot - Minot Landfill | Minot | 5.03 | — | ND0022896 | Mar 2030 | 20 |
| West Fargo City Of | West Fargo | 5 | — | ND0022616 | Sep 2029 | 4 |
| Devils Lake City Of | Devils Lake | 3.8 | 5.5 | ND0020681 | Mar 2028 | 77 |
| Williston City Of | Williston | 2.86 | 6 | ND0022349 | Mar 2028 | 4 |
| Casselton City Of | Casselton | 2.85 | 8.6 | ND0020567 | Sep 2029 | 18 |
| New Town Water Resource Recovery Facility | New Town | 2.3 | 0.92 | NDG589108 | Mar 2027 | 1 |
| Mandan Landfill / Ts | Mandan | 1.69 | — | ND0022861 | Sep 2031 | 0 |
Treatment technology for each plant is shown with a free Klarifi account. Create one →
North Dakota plants by treatment technology
All 200 plants in North Dakota
Wastewater treatment in North Dakota: 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 · Significant industrial user · Biosolids · 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. “Wastewater treatment plants in North Dakota.” Updated October 26, 2026. https://klarifi.io/facilities/north-dakotaNeed a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.