Clean Water Act discharge permit · NPDES CO0038334
LONDON WATER TUNNEL, Park County, CO: NPDES CO0038334 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 17Pollutants with an effluent exceedance
LONDON WATER TUNNEL, held by MineWater Finance LLC, holds NPDES permit CO0038334, which discharges to South Mosquito Creek. EPA’s file records it issued December 21, 2005 and expiring January 31, 2011. 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 | LONDON WATER TUNNEL |
|---|---|
| Permittee as filed | MineWater Finance LLC |
| NPDES ID | CO0038334 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 21, 2005 |
| Expiration date | January 31, 2011 |
| Address | Park County, CO 80440 |
| Receiving water | SOUTH MOSQUITO CREEK |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Mosquito Creek (HUC 101900010101) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 36Pollutants on file
- 19Under a numeric limit
- 36With a violation of any kind
- 17With 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 |
|---|---|---|---|---|---|
| Zinc, potentially dissolved | 3 | 280 | 270 | December 31, 2025 | 637% over the limit |
| Cadmium, potentially dissolvd | 2 | 100 | 97 | July 31, 2026 | 1,150% over the limit |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | 0 | 30 | 29 | June 30, 2004 | 99,999% over the limit |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 12 | 9 | June 30, 2007 | 85% over the limit |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | 0 | 30 | 7 | December 31, 2025 | 75% over the limit |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | 0 | 8 | 6 | June 30, 2004 | 99,999% over the limit |
| pH | 2 | 18 | 4 | February 28, 2010 | |
| Silver, potentially dissolved | 2 | 8 | 4 | July 31, 2026 | 443% over the limit |
| Solids, total suspended | 2 | 13 | 3 | August 31, 2012 | 150% over the limit |
| Mercury, total [as Hg] | 2 | 14 | 2 | March 31, 2004 | 20% over the limit |
| Lead, potentially dissolvd | 2 | 6 | 2 | July 31, 2024 | 66% over the limit |
| Selenium, potentially dissolvd | 2 | 6 | 2 | May 31, 2021 | 19% over the limit |
| Oil and grease | 1 | 11 | 1 | September 30, 2016 | 300% over the limit |
| Oil & Grease | 0 | 5 | 1 | January 31, 2002 | 70% over the limit |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | 0 | 5 | 1 | June 30, 2006 | 13% over the limit |
| Copper, potentially dissolved | 2 | 3 | 1 | July 31, 2025 | 73% over the limit |
| Manganese, dissolved [as Mn] | 0 | 1 | 1 | July 31, 2021 | 2% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 14 | 0 | ||
| Cadmium, total recoverable | 0 | 8 | 0 | ||
| Lead, total recoverable | 0 | 8 | 0 | ||
| Copper, total recoverable | 0 | 8 | 0 | ||
| Static Renewal 7 Day Chronic Pimephales promelas | 0 | 8 | 0 | ||
| Oil and grease visual | 1 | 7 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 0 | 5 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 0 | 5 | 0 | ||
| Cyanide, total [as CN] | 0 | 4 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 0 | 4 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 0 | 4 | 0 | ||
| Cyanide, weak acid, dissociable | 2 | 2 | 0 | ||
| Iron, total recoverable | 2 | 2 | 0 | ||
| Chromium, hexavalent potentially disolvd | 2 | 2 | 0 | ||
| Manganese, potentially dissolvd | 2 | 2 | 0 | ||
| Nickel, potentially dissolvd | 2 | 2 | 0 | ||
| Mercury, total [low level] | 0 | 2 | 0 | ||
| Arsenic, total [as As] | 1 | 1 | 0 | ||
| Chromium, trivalent total recoverable | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 15, 2025 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| July 16, 2021 | Reporting Violations - Improper/ Incorrect Reporting | 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 14, 2026.