Clean Water Act discharge permit · NPDES SD0024279
SD GFP - SYLVAN LAKE (CUSTER STATE PARK), Custer, SD: NPDES SD0024279 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 12Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
SD GFP - SYLVAN LAKE (CUSTER STATE PARK), held by SD GFP - Sylvan Lake (Custer State Park), holds NPDES permit SD0024279, which discharges to Willow Creek. EPA’s file records it issued May 27, 2020 and expiring March 31, 2025. 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 | SD GFP - SYLVAN LAKE (CUSTER STATE PARK) |
|---|---|
| Permittee as filed | SD GFP - Sylvan Lake (Custer State Park) |
| NPDES ID | SD0024279 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 27, 2020 |
| Expiration date | March 31, 2025 |
| Issuing agency | SDDANR |
| Address | Custer, SD 57730 |
| Receiving water | Willow Creek |
| Subwatershed | Stockade Lakes-French Creek (HUC 101201090602) |
| 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
- 16Pollutants on file
- 12Under a numeric limit
- 16With a violation of any kind
- 6With 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 | 8 | 70 | 61 | May 31, 2019 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 8 | 38 | 29 | May 31, 2012 | 99,999% over the limit |
| pH | 8 | 27 | 19 | February 28, 2021 | |
| Nitrogen, ammonia total [as N] | 24 | 24 | 14 | June 30, 2011 | 733% over the limit |
| Coliform, fecal general | 0 | 27 | 6 | June 30, 2011 | 850% over the limit |
| Chlorine, total residual | 2 | 5 | 2 | September 30, 2000 | 163% over the limit |
| Temperature, water deg. centigrade | 6 | 8 | 0 | ||
| Flow rate | 6 | 8 | 0 | ||
| E. coli, colony forming units [CFU] | 6 | 7 | 0 | ||
| Flow, total | 3 | 3 | 0 | ||
| Duration of discharge | 3 | 3 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 2 | 0 | ||
| Solids, total dissolved | 0 | 2 | 0 | ||
| Nitrogen, total [as N] | 3 | 1 | 0 | ||
| Phosphorus, total [as P] | 3 | 1 | 0 | ||
| Flow, total | 0 | 1 | 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 SD0024279.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, SD0024279.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 SD0024279 there.
Nearby on the register
- Discharge permits in Custer
- Every permit record in Custer, A to Z
- Discharge permits in South Dakota
- Every permit record in South Dakota, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.