Clean Water Act discharge permit · NPDES MN0056723
SKYWATER TECHNOLOGY FOUNDRY, Bloomington, MN: NPDES MN0056723 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 53Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
SKYWATER TECHNOLOGY FOUNDRY, held by Skywater Technology Foundry Inc, holds NPDES permit MN0056723. EPA’s file records it issued April 1, 2026 and expiring March 31, 2031. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SKYWATER TECHNOLOGY FOUNDRY |
|---|---|
| Permittee as filed | Skywater Technology Foundry Inc |
| NPDES ID | MN0056723 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | April 1, 2026 |
| Expiration date | March 31, 2031 |
| Issuing agency | STA |
| Address | Bloomington, MN 55425 |
| Subwatershed | Minnesota River (HUC 070200121110) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 56Pollutants on file
- 53Under a numeric limit
- 6With 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 |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 3 | 3 | 3 | December 31, 2021 | 63% over the limit |
| Chlorine, total residual | 0 | 10 | 2 | September 30, 1992 | 60% over the limit |
| Flow, in conduit or thru treatment plant | 3 | 74 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 4 | 0 | ||
| Solids, total suspended | 5 | 1 | 0 | ||
| Potassium, total [as K] | 0 | 1 | 0 | ||
| Perfluorooctanoic acid (PFOA) | 8 | 0 | 0 | ||
| Perfluorobutanoic acid (PFBA) | 8 | 0 | 0 | ||
| Perfluorooctanesulfonamide (PFOSA) | 8 | 0 | 0 | ||
| Perfluoropentanoic acid (PFPeA) | 8 | 0 | 0 | ||
| Perfluorohexanoic acid (PFHxA) | 8 | 0 | 0 | ||
| Perfluoroheptanoic acid (PFHpA) | 8 | 0 | 0 | ||
| Perfluorononanoic acid (PFNA) | 8 | 0 | 0 | ||
| Perfluorodecanoic acid (PFDA) | 8 | 0 | 0 | ||
| Perfluoroundecanoic acid (PFUnA) | 8 | 0 | 0 | ||
| Perfluorododecanoic acid (PFDoA) | 8 | 0 | 0 | ||
| Perfluorotridecanoic acid (PFTrDA) | 8 | 0 | 0 | ||
| Perfluorotetradecanoic acid (PFTeDA) | 8 | 0 | 0 | ||
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | 8 | 0 | 0 | ||
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | 8 | 0 | 0 | ||
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | 8 | 0 | 0 | ||
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | 8 | 0 | 0 | ||
| Perfluorobutanesulfonic acid (PFBS) | 8 | 0 | 0 | ||
| Perfluorodecanesulfonic acid (PFDS) | 8 | 0 | 0 | ||
| Perfluoroheptanesulfonic acid (PFHpS) | 8 | 0 | 0 | ||
| Perfluorohexanesulfonic acid (PFHxS) | 8 | 0 | 0 | ||
| Perfluorooctanesulfonic acid (PFOS) | 8 | 0 | 0 | ||
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | 8 | 0 | 0 | ||
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | 8 | 0 | 0 | ||
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | 8 | 0 | 0 | ||
| Perfluoropentanesulfonic acid (PFPeS) | 8 | 0 | 0 | ||
| Perfluorononanesulfonic acid (PFNS) | 8 | 0 | 0 | ||
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | 8 | 0 | 0 | ||
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | 8 | 0 | 0 | ||
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | 8 | 0 | 0 | ||
| Perfluorododecanesulfonic acid (PFDoS) | 8 | 0 | 0 | ||
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | 8 | 0 | 0 | ||
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | 8 | 0 | 0 | ||
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | 8 | 0 | 0 | ||
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | 8 | 0 | 0 | ||
| Perfluoro-3-methoxypropanoic acid (PFMPA) | 8 | 0 | 0 | ||
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | 8 | 0 | 0 | ||
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | 8 | 0 | 0 | ||
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | 8 | 0 | 0 | ||
| Perfluoro-4-methoxybutanoic acid (PFMBA) | 8 | 0 | 0 | ||
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | 8 | 0 | 0 | ||
| Fluoride, total [as F] | 4 | 0 | 0 | ||
| Copper, total [as Cu] | 3 | 0 | 0 | ||
| Lead, total [as Pb] | 3 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Nitrogen, total [as N] | 1 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Chloride [as Cl] | 1 | 0 | 0 | ||
| Sulfate, total [as SO4] | 1 | 0 | 0 | ||
| Solids, total dissolved | 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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 26, 2023 | Effluent Violations - Narrative Effluent Violation | ST6 |
| September 26, 2023 | Monitoring Violations - Analysis not Conducted | ST6 |
| September 26, 2023 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| September 26, 2023 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| September 26, 2023 | Effluent Violations - Unauthorized Discharge | ST6 |
| September 26, 2023 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| September 26, 2023 | Management Practice Violations - Failure to Develop/Enforce Standards | 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 September 14, 2026.