Clean Water Act discharge permit · NPDES MN0021466
MOUNTAIN LAKE WWTP, Mountain Lake, MN: NPDES MN0021466 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 24Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
MOUNTAIN LAKE WWTP, held by Mountain Lake city of, holds NPDES permit MN0021466. EPA’s file records it issued November 1, 2018 and expiring August 31, 2023. 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 | MOUNTAIN LAKE WWTP |
|---|---|
| Permittee as filed | Mountain Lake city of |
| NPDES ID | MN0021466 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 1, 2018 |
| Expiration date | August 31, 2023 |
| Issuing agency | STA |
| Address | Mountain Lake, MN 56159 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Headwaters Watonwan River (HUC 070200100101) |
| 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
- 24Pollutants on file
- 24Under a numeric limit
- 22With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 7 | 13 | 8 | April 30, 2022 | 56% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 5 | 5 | 4 | April 30, 2022 | 93% over the limit |
| pH | 3 | 9 | 3 | December 31, 2025 | |
| Phosphorus, total [as P] | 3 | 2 | 1 | December 31, 2025 | 107% over the limit |
| Mercury, total [as Hg] | 3 | 9 | 0 | ||
| Nitrogen, total [as N] | 2 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 6 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 6 | 0 | ||
| Mercury, dissolved [as Hg] | 2 | 6 | 0 | ||
| Specific conductance | 1 | 3 | 0 | ||
| Bicarbonate ion- [as HCO3] | 1 | 3 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 3 | 0 | ||
| Calcium, total [as Ca] | 1 | 3 | 0 | ||
| Magnesium, total [as Mg] | 1 | 3 | 0 | ||
| Sodium, total [as Na] | 1 | 3 | 0 | ||
| Potassium, total [as K] | 1 | 3 | 0 | ||
| Chloride [as Cl] | 1 | 3 | 0 | ||
| Sulfate, total [as SO4] | 1 | 3 | 0 | ||
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | 1 | 3 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 2 | 0 | ||
| Solids, total dissolved | 1 | 2 | 0 | ||
| Precipitation, total defined period/in | 1 | 1 | 0 | ||
| Flow, in conduit or thru treatment plant | 9 | 0 | 0 | ||
| Coliform, fecal MPN + membrane ftl 44.5 C | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MN0021466.
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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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 MN0021466 there.
Nearby on the register
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- Every permit record in Mountain Lake, A to Z
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- Every permit record in Minnesota, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.