Clean Water Act discharge permit · NPDES SDP000062
RIDLEY BLOCK OPERATIONS, Whitewood, SD: NPDES SDP000062 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
RIDLEY BLOCK OPERATIONS, held by Ridley Block Operations, holds NPDES permit SDP000062, which discharges to Whitewood Potw. EPA’s file records it issued June 24, 2015 and expiring June 30, 2020. 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 | RIDLEY BLOCK OPERATIONS |
|---|---|
| Permittee as filed | Ridley Block Operations |
| NPDES ID | SDP000062 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual industrial user permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 24, 2015 |
| Expiration date | June 30, 2020 |
| Issuing agency | SDDANR |
| Address | Whitewood, SD 57793 |
| Receiving water | Whitewood POTW |
| Receiving water impaired | 303(D) Listed |
| NAICS | 311119 – Other Animal Food Manufacturing |
| SIC | 2048 – Prepared Feeds |
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
- 12Pollutants on file
- 9Under a numeric limit
- 11With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 10 | 44 | 8 | October 31, 2012 | 89% over the limit |
| Solids, total suspended | 10 | 16 | 7 | August 31, 2006 | 153% over the limit |
| pH | 4 | 7 | 5 | September 30, 2025 | |
| Oil and grease, hexane extr method | 4 | 14 | 4 | April 30, 2026 | 76% over the limit |
| Nitrogen, ammonia total [as N] | 10 | 13 | 4 | April 30, 2005 | 92% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 16 | 0 | ||
| Temperature, water deg. fahrenheit | 4 | 8 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 4 | 0 | ||
| Phosphorus, total [as P] | 0 | 4 | 0 | ||
| Flow rate | 2 | 3 | 0 | ||
| Oil and grease | 0 | 1 | 0 | ||
| Flow, process wastewater | 4 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 13, 2026 | Reporting Violations - Failure to Notify | 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
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, SDP000062.
Start the watch
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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 SDP000062 there.
Nearby on the register
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- Every permit record in Whitewood, 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.