Clean Water Act discharge permit · NPDES MN0020231
CALEDONIA WWTP, Caledonia, MN: NPDES MN0020231 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 26Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
CALEDONIA WWTP, held by Caledonia city of, holds NPDES permit MN0020231. EPA’s file records it issued February 1, 2019 and expiring January 31, 2024. 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 | CALEDONIA WWTP |
|---|---|
| Permittee as filed | Caledonia city of |
| NPDES ID | MN0020231 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | February 1, 2019 |
| Expiration date | January 31, 2024 |
| Issuing agency | STA |
| Address | Caledonia, MN 55921 |
| Subwatershed | South Fork Crooked Creek (HUC 070600010202) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 26Pollutants on file
- 26Under a numeric limit
- 6With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Nitrogen, total [as N] | 3 | 53 | 53 | June 30, 2025 | 216% over the limit |
| Solids, total suspended | 7 | 22 | 22 | July 31, 2026 | 282% over the limit |
| Coliform, fecal MPN + membrane ftl 44.5 C | 1 | 6 | 6 | April 30, 2025 | 720% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 6 | 3 | 3 | July 31, 2025 | 25% over the limit |
| Chlorine, total residual | 1 | 5 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 1 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 0 | 0 | ||
| pH | 4 | 0 | 0 | ||
| Phosphorus, total [as P] | 3 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 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 | ||
| 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 | ||
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | 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 |
|---|---|---|
| November 8, 2023 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| November 8, 2023 | 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.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MN0020231 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.