Clean Water Act discharge permit · NPDES SD0022187
GROTON, CITY OF, Groton, SD: NPDES SD0022187 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
GROTON, CITY OF, held by Groton, City of, holds NPDES permit SD0022187, which discharges to Unnamed Tributary Of Mud Creek. EPA’s file records it issued September 1, 2016 and expiring June 30, 2021. 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 | GROTON, CITY OF |
|---|---|
| Permittee as filed | Groton, City of |
| NPDES ID | SD0022187 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 1, 2016 |
| Expiration date | June 30, 2021 |
| Issuing agency | SDDENR |
| Address | Groton, SD 57445 |
| Receiving water | Unnamed Tributary of Mud Creek |
| Subwatershed | Olive Grove Creek (HUC 101600050105) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 14Pollutants on file
- 10Under a numeric limit
- 12With a violation of any kind
- 5With 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, ammonia total [as N] | 4 | 92 | 27 | April 30, 2026 | 1,048% over the limit |
| Solids, total suspended | 2 | 79 | 18 | May 31, 2024 | 158% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 76 | 13 | May 31, 2024 | 270% over the limit |
| pH | 2 | 75 | 1 | May 31, 2024 | |
| E. coli, colony forming units [CFU] | 2 | 1 | 1 | May 31, 2023 | 56% over the limit |
| Flow rate | 2 | 65 | 0 | ||
| Temperature, water deg. centigrade | 2 | 64 | 0 | ||
| Chlorine, total residual | 0 | 32 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 28 | 0 | ||
| Coliform, fecal general | 0 | 18 | 0 | ||
| Duration of discharge | 1 | 6 | 0 | ||
| Flow | 0 | 6 | 0 | ||
| Flow, total | 1 | 0 | 0 | ||
| Flowing, Receiving Stream | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 30, 2026 | Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | ST6 |
| July 30, 2026 | Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | ST6 |
| July 9, 2026 | Wet-weather SSO discharge to waters of the U.S., not permit compliant, no endangerment | ST6 |
| July 8, 2026 | Wet-weather SSO discharge to waters of the U.S., not permit compliant, no 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.
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 SD0022187 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.