Clean Water Act discharge permit · NPDES CO0046761
BLACK HAWK/CENTRAL CITY SD WWTF, Gilpin County, CO: NPDES CO0046761 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 41Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
BLACK HAWK/CENTRAL CITY SD WWTF, held by Black Hawk/Central City Sanitation District, holds NPDES permit CO0046761, which discharges to Clear Creek. EPA’s file records it issued July 27, 2005 and expiring August 31, 2010. 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 | BLACK HAWK/CENTRAL CITY SD WWTF |
|---|---|
| Permittee as filed | Black Hawk/Central City Sanitation District |
| NPDES ID | CO0046761 |
| 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 | July 27, 2005 |
| Expiration date | August 31, 2010 |
| Address | Gilpin County, CO 80403 |
| Receiving water | CLEAR CREEK |
| Subwatershed | North Clear Creek (HUC 101900040206) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 45Pollutants on file
- 41Under a numeric limit
- 17With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 7 | 7 | June 30, 2025 | 75% over the limit |
| Cadmium, potentially dissolvd | 4 | 1 | 1 | November 30, 2011 | 32% over the limit |
| E. coli | 0 | 1 | 1 | March 31, 2014 | 266% over the limit |
| Temperature, water deg. centigrade | 0 | 67 | 0 | ||
| Nonylphenol | 0 | 26 | 0 | ||
| Nitrogen, ammonia total [as N] | 24 | 12 | 0 | ||
| Iron, total recoverable | 2 | 11 | 0 | ||
| BOD, 5-day, 20 deg. C | 4 | 4 | 0 | ||
| Selenium, potentially dissolvd | 2 | 2 | 0 | ||
| Chlorine, total residual | 2 | 2 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 2 | 2 | 0 | ||
| Oil and grease | 1 | 2 | 0 | ||
| Solids, total suspended | 4 | 1 | 0 | ||
| Mercury, total [as Hg] | 4 | 1 | 0 | ||
| BOD, carbonaceous, percent removal | 1 | 1 | 0 | ||
| Solids, suspended percent removal | 1 | 1 | 0 | ||
| Oil and grease visual | 1 | 1 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Cyanide, weak acid, dissociable | 2 | 0 | 0 | ||
| Cyanide, total [as CN] | 2 | 0 | 0 | ||
| Arsenic, total [as As] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 | ||
| Copper, total [as Cu] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Molybdenum, total [as Mo] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Silver, total [as Ag] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 0 | 0 | ||
| Zinc, potentially dissolved | 2 | 0 | 0 | ||
| Silver, potentially dissolved | 2 | 0 | 0 | ||
| Copper, potentially dissolved | 2 | 0 | 0 | ||
| Lead, potentially dissolvd | 2 | 0 | 0 | ||
| Manganese, potentially dissolvd | 2 | 0 | 0 | ||
| Nickel, potentially dissolvd | 2 | 0 | 0 | ||
| Chromium, trivalent total recoverable | 2 | 0 | 0 | ||
| Phenols | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Coliform, fecal general | 2 | 0 | 0 | ||
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| %Effect Static Renewal 7Day Chronic Pimephales promelas | 2 | 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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 1, 2024 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | ST6 |
| July 1, 2021 | Effluent Violations - Failed Toxicity Test | ST6 |
| October 1, 2019 | Effluent Violations - Failed Toxicity Test | ST6 |
| July 1, 2019 | Effluent Violations - Failed Toxicity Test | ST6 |
| January 2, 2018 | Effluent Violations - Failed Toxicity Test | ST6 |
| January 1, 2018 | Effluent Violations - Failed Toxicity Test | ST6 |
| July 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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Nearby on the register
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- Every permit record in Colorado, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.