Clean Water Act discharge permit · NPDES CO0021075
AVONDALE WWTP, Pueblo County, CO: NPDES CO0021075 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 15Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
AVONDALE WWTP, held by Avondale Water and Sanitation District, holds NPDES permit CO0021075, which discharges to Green Arroyo/Land App & Exfilt Pnds. EPA’s file records it issued November 17, 2005 and expiring December 31, 2010. 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 | AVONDALE WWTP |
|---|---|
| Permittee as filed | Avondale Water and Sanitation District |
| NPDES ID | CO0021075 |
| 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 | November 17, 2005 |
| Expiration date | December 31, 2010 |
| Address | Pueblo County, CO 81022 |
| Receiving water | GREEN ARROYO/LAND APP & EXFILT PNDS |
| Subwatershed | Boone Creek-Arkansas River (HUC 110200050301) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 19Pollutants on file
- 15Under a numeric limit
- 19With a violation of any kind
- 7With 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, percent removal | 2 | 35 | 28 | May 31, 2026 | 259% over the limit |
| BOD, 5-day, 20 deg. C | 12 | 66 | 17 | May 31, 2026 | 71% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 0 | 24 | 4 | December 31, 2001 | 28% over the limit |
| Solids, total suspended | 8 | 32 | 3 | November 30, 2024 | 23% over the limit |
| E. coli | 0 | 9 | 3 | April 30, 2026 | 99,999% over the limit |
| Flow, in conduit or thru treatment plant | 9 | 41 | 1 | April 30, 2015 | 136% over the limit |
| Chlorine, total residual | 2 | 5 | 1 | March 31, 2026 | 20% over the limit |
| Depth to water level ft below landsurface | 14 | 39 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 18 | 0 | ||
| Nitrite + Nitrate total [as N] | 14 | 17 | 0 | ||
| Chloride [as Cl] | 14 | 17 | 0 | ||
| Solids, total dissolved | 14 | 17 | 0 | ||
| Coliform, total general | 14 | 17 | 0 | ||
| Chemical Oxygen Demand [COD] | 14 | 17 | 0 | ||
| Coliform, fecal general | 6 | 11 | 0 | ||
| Oil and grease | 2 | 9 | 0 | ||
| pH | 4 | 8 | 0 | ||
| Oil and grease visual | 2 | 4 | 0 | ||
| Plant capacity fact. percent of capacity | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 19, 2023 | Management Practice Violations - Improper Operation and Maintenance | 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 September 15, 2026.