Clean Water Act discharge permit · NPDES MN0051284
OWATONNA WWTP, Owatonna, MN: NPDES MN0051284 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 33Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
OWATONNA WWTP, held by Owatonna city of, holds NPDES permit MN0051284. EPA’s file records it issued June 1, 2021 and expiring May 31, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | OWATONNA WWTP |
|---|---|
| Permittee as filed | Owatonna city of |
| NPDES ID | MN0051284 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | June 1, 2021 |
| Expiration date | May 31, 2026 |
| Issuing agency | STA |
| Address | Owatonna, MN 55060 |
| Subwatershed | Maple Creek-Straight River (HUC 070400020307) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler MND980618094 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 33Pollutants on file
- 33Under a numeric limit
- 5With a violation of any kind
- 2With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| BOD, carbonaceous [5 day, 20 C] | 10 | 9 | 9 | November 30, 2024 | 140% over the limit |
| pH | 4 | 2 | 2 | October 31, 2023 | |
| Nitrogen, total [as N] | 2 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 14 | 0 | 0 | ||
| Solids, total suspended | 7 | 0 | 0 | ||
| Phosphorus, total [as P] | 6 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 3 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 3 | 0 | 0 | ||
| Specific conductance | 1 | 0 | 0 | ||
| Precipitation, total defined period/in | 1 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 0 | 0 | ||
| Bicarbonate ion- [as HCO3] | 1 | 0 | 0 | ||
| Cyanide, total [as CN] | 1 | 0 | 0 | ||
| Cyanide, free [amenable to chlorination] | 1 | 0 | 0 | ||
| Calcium, total [as Ca] | 1 | 0 | 0 | ||
| Magnesium, total [as Mg] | 1 | 0 | 0 | ||
| Sodium, total [as Na] | 1 | 0 | 0 | ||
| Potassium, total [as K] | 1 | 0 | 0 | ||
| Chloride [as Cl] | 1 | 0 | 0 | ||
| Sulfate, total [as SO4] | 1 | 0 | 0 | ||
| Cadmium, total [as Cd] | 1 | 0 | 0 | ||
| Copper, total [as Cu] | 1 | 0 | 0 | ||
| Lead, total [as Pb] | 1 | 0 | 0 | ||
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | 1 | 0 | 0 | ||
| Coliform, fecal MPN + membrane ftl 44.5 C | 1 | 0 | 0 | ||
| Chlorine, total residual | 1 | 0 | 0 | ||
| Solids, total dissolved | 1 | 0 | 0 | ||
| Mercury, dissolved [as Hg] | 1 | 0 | 0 | ||
| Mercury, total [as Hg] | 1 | 0 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 1 | 0 | 0 | ||
| Solids, suspended percent removal | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 5, 2023 | Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| March 16, 2020 | Biosolids - Land Application: Applied to Land at Greater than the Agronomic Rate Violation | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.