Clean Water Act discharge permit · NPDES CO0049054
MAY DAY MINE, Hesperus, CO: NPDES CO0049054 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 20Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
MAY DAY MINE, held by Sunrise Mining LLC, holds NPDES permit CO0049054, which discharges to Little Deadwood Gulch/La Plata River. EPA’s file records it issued January 31, 2022 and expiring January 31, 2027. 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.
What the register holds for MAY DAY MINE: its NPDES ID, its permit type and status, its dates, its address in Hesperus, Colorado, its receiving water, and 20 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES CO0049054.
Identity
| Facility as filed | MAY DAY MINE |
|---|---|
| Permittee as filed | Sunrise Mining LLC |
| NPDES ID | CO0049054 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | January 31, 2022 |
| Expiration date | January 31, 2027 |
| Address | Hesperus, CO |
| Receiving water | Little Deadwood Gulch/La Plata River |
| Subwatershed | Mayday Valley-La Plata River (HUC 140801050102) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 20Pollutants on file
- 20Under a numeric limit
- 0With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| Area inspection visual | 18 | 0 | 0 | ||
| Zinc, potentially dissolved | 6 | 0 | 0 | ||
| Copper, potentially dissolved | 6 | 0 | 0 | ||
| Cadmium, potentially dissolvd | 6 | 0 | 0 | ||
| Lead, potentially dissolvd | 6 | 0 | 0 | ||
| Arsenic, total recoverable | 5 | 0 | 0 | ||
| pH | 4 | 0 | 0 | ||
| Chromium, total recoverable | 4 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 4 | 0 | 0 | ||
| Silver, potentially dissolved | 4 | 0 | 0 | ||
| Manganese, potentially dissolvd | 4 | 0 | 0 | ||
| Nickel, potentially dissolvd | 4 | 0 | 0 | ||
| Selenium, potentially dissolvd | 4 | 0 | 0 | ||
| Iron, total recoverable | 3 | 0 | 0 | ||
| Lead, total recoverable | 3 | 0 | 0 | ||
| Mercury, total low level | 3 | 0 | 0 | ||
| Iron, dissolved [as Fe] | 2 | 0 | 0 | ||
| Nickel, total recoverable | 2 | 0 | 0 | ||
| Cadmium, total recoverable | 2 | 0 | 0 | ||
| Chromium, trivalent, potentially dissolvd | 2 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES CO0049054.
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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES CO0049054.
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
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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 CO0049054 there.
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 15, 2026.