Clean Water Act discharge permit · NPDES COG590057
SOUTH DURANGO SANITATION DISTRICT WWTF, Durango, CO: NPDES COG590057 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 16Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
SOUTH DURANGO SANITATION DISTRICT WWTF, held by South Durango Sanitation District, holds NPDES permit COG590057, which discharges to Animas River. EPA’s file records it issued November 17, 2021 and expiring March 31, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | SOUTH DURANGO SANITATION DISTRICT WWTF |
|---|---|
| Permittee as filed | South Durango Sanitation District |
| NPDES ID | COG590057 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | November 17, 2021 |
| Expiration date | March 31, 2026 |
| Address | Durango, CO 81303 |
| Receiving water | Animas River |
| Subwatershed | Basin Creek-Animas River (HUC 140801040901) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 16Under a numeric limit
- 16With a violation of any kind
- 1With 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 |
|---|---|---|---|---|---|
| LC50 Static Renewal 96Hr Acute Pimephales promelas | 2 | 1 | 1 | March 31, 2025 | 56% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 6 | 0 | ||
| Solids, total suspended | 4 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 4 | 0 | ||
| Solids, total dissolved | 3 | 3 | 0 | ||
| Plant capacity fact. percent of capacity | 2 | 2 | 0 | ||
| pH | 2 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 2 | 0 | ||
| E. coli | 2 | 2 | 0 | ||
| Manganese, dissolved [as Mn] | 2 | 1 | 0 | ||
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | 2 | 1 | 0 | ||
| Oil and grease | 1 | 1 | 0 | ||
| Chlorine, total residual | 1 | 1 | 0 | ||
| BOD, 5-day, percent removal | 1 | 1 | 0 | ||
| Solids, suspended percent removal | 1 | 1 | 0 | ||
| Oil and grease visual | 1 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 1, 2025 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | 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, COG590057.
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 COG590057 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.