Clean Water Act discharge permit · NPDES CO0020508
EVANS CITY OF WWTF, Weld County, CO: NPDES CO0020508 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 0Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
EVANS CITY OF WWTF, held by EVANS, CITY OF, holds NPDES permit CO0020508, which discharges to South Platte River. EPA’s file records it issued October 16, 2001 and expiring November 30, 2006. 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 | EVANS CITY OF WWTF |
|---|---|
| Permittee as filed | EVANS, CITY OF |
| NPDES ID | CO0020508 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 16, 2001 |
| Expiration date | November 30, 2006 |
| Address | Weld County, CO 80620 |
| Receiving water | SOUTH PLATTE RIVER |
| Subwatershed | City of Evans-South Platte River (HUC 101900030606) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 26Pollutants on file
- 0Under a numeric limit
- 26With a violation of any kind
- 9With 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 | 0 | 99 | 89 | August 31, 2018 | 140% over the limit |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | 0 | 32 | 29 | June 30, 2018 | 76% over the limit |
| Solids, total suspended | 0 | 24 | 20 | April 30, 2018 | 43% over the limit |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | 0 | 21 | 18 | June 30, 2018 | 89% over the limit |
| E. coli, thermotol, MF, MTEC | 0 | 14 | 12 | June 30, 2015 | 1,824% over the limit |
| pH | 0 | 11 | 9 | October 31, 2017 | |
| BOD, 5-day, percent removal | 0 | 9 | 8 | October 31, 2016 | 67% over the limit |
| Nitrogen, ammonia total [as N] | 0 | 3 | 1 | April 30, 2017 | 2% over the limit |
| Chlorine, total residual | 0 | 3 | 1 | August 31, 2017 | 6% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 11 | 0 | ||
| Cyanide, weak acid, dissociable | 0 | 8 | 0 | ||
| Cyanide, total [as CN] | 0 | 1 | 0 | ||
| Arsenic, total [as As] | 0 | 1 | 0 | ||
| Cadmium, total [as Cd] | 0 | 1 | 0 | ||
| Chromium, total [as Cr] | 0 | 1 | 0 | ||
| Copper, total [as Cu] | 0 | 1 | 0 | ||
| Lead, total [as Pb] | 0 | 1 | 0 | ||
| Molybdenum, total [as Mo] | 0 | 1 | 0 | ||
| Nickel, total [as Ni] | 0 | 1 | 0 | ||
| Silver, total [as Ag] | 0 | 1 | 0 | ||
| Zinc, total [as Zn] | 0 | 1 | 0 | ||
| Selenium, total [as Se] | 0 | 1 | 0 | ||
| Oil and grease | 0 | 1 | 0 | ||
| Phenols | 0 | 1 | 0 | ||
| Mercury, total [as Hg] | 0 | 1 | 0 | ||
| Oil and grease visual | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 1, 2018 | Effluent Violations - Failed Toxicity Test | ST6 |
| April 1, 2018 | Effluent Violations - Failed Toxicity Test | ST6 |
| January 1, 2018 | Effluent Violations - Failed Toxicity Test | ST6 |
| April 1, 2017 | Effluent Violations - Failed Toxicity Test | ST6 |
| January 1, 2017 | Effluent Violations - Failed Toxicity Test | 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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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 CO0020508 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.