Clean Water Act discharge permit · NPDES SD0023361
MITCHELL, CITY OF, Mitchell, SD: NPDES SD0023361 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 24Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
MITCHELL, CITY OF, held by Mitchell, City of, holds NPDES permit SD0023361, which discharges to James River. EPA’s file records it issued October 1, 2012 and expiring September 30, 2017. 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 | MITCHELL, CITY OF |
|---|---|
| Permittee as filed | Mitchell, City of |
| NPDES ID | SD0023361 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 1, 2012 |
| Expiration date | September 30, 2017 |
| Issuing agency | SDDANR |
| Address | Mitchell, SD 57301 |
| Receiving water | JAMES RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Rock Creek-James River (HUC 101600111402) |
| Program components on file | POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| 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
- 48Pollutants on file
- 24Under a numeric limit
- 41With 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 |
|---|---|---|---|---|---|
| pH | 6 | 30 | 9 | June 30, 2025 | |
| Solids, total suspended | 3 | 26 | 9 | June 30, 2025 | 62% over the limit |
| Nitrogen, ammonia total [as N] | 71 | 58 | 0 | ||
| Flow rate | 7 | 30 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 17 | 0 | ||
| Temperature, water deg. centigrade | 5 | 16 | 0 | ||
| Coliform, fecal general | 4 | 10 | 0 | ||
| Chlorine, total residual | 0 | 9 | 0 | ||
| Conductivity | 2 | 8 | 0 | ||
| Oil and grease visual | 2 | 7 | 0 | ||
| Oil & Grease | 0 | 7 | 0 | ||
| Nitrogen, nitrite total [as N] | 2 | 6 | 0 | ||
| Nitrogen, nitrate total [as N] | 2 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 6 | 0 | ||
| Chloride [as Cl] | 2 | 6 | 0 | ||
| Sulfate, total [as SO4] | 2 | 6 | 0 | ||
| Solids, total dissolved | 2 | 6 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 0 | 4 | 0 | ||
| E. coli, colony forming units [CFU] | 5 | 2 | 0 | ||
| Cyanide, weak acid, dissociable | 0 | 2 | 0 | ||
| Cyanide, total [as CN] | 0 | 2 | 0 | ||
| Arsenic, total [as As] | 0 | 2 | 0 | ||
| Beryllium, total [as Be] | 0 | 2 | 0 | ||
| Cadmium, total [as Cd] | 0 | 2 | 0 | ||
| Chromium, total [as Cr] | 0 | 2 | 0 | ||
| Copper, total [as Cu] | 0 | 2 | 0 | ||
| Lead, total [as Pb] | 0 | 2 | 0 | ||
| Thallium, total [as Tl] | 0 | 2 | 0 | ||
| Molybdenum, total [as Mo] | 0 | 2 | 0 | ||
| Nickel, total [as Ni] | 0 | 2 | 0 | ||
| Silver, total [as Ag] | 0 | 2 | 0 | ||
| Zinc, total [as Zn] | 0 | 2 | 0 | ||
| Antimony, total [as Sb] | 0 | 2 | 0 | ||
| Aluminum, total recoverable | 0 | 2 | 0 | ||
| Selenium, total [as Se] | 0 | 2 | 0 | ||
| Phenols | 0 | 2 | 0 | ||
| Mercury, total [as Hg] | 0 | 2 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 0 | 2 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 0 | 2 | 0 | ||
| Flow, total | 3 | 1 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 1 | 0 | ||
| Duration of discharge | 3 | 0 | 0 | ||
| Report due [yrmoda] | 3 | 0 | 0 | ||
| Oil and grease, hexane extr method | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Sodium adsorption ratio | 2 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 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
- 14Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 6, 2025 | Failure to submit report to the permitting authority of any anticipated bypass [122.41(m)(3)(i)] | ST6 |
| November 20, 2025 | Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| November 20, 2025 | Dry-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| September 30, 2025 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| June 25, 2025 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | ST6 |
| June 12, 2025 | Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | ST6 |
| May 15, 2025 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| April 18, 2025 | Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| June 30, 2024 | PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)] | ST6 |
| June 27, 2024 | PR: Failure to submit noncompliance report - CSO, SSO, or Bypass [40 CFR 122.41(l)(6) & (m)(3)(ii)] | ST6 |
| June 24, 2024 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| June 24, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | ST6 |
| June 21, 2024 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| June 21, 2024 | Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangerment | 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.