Clean Water Act discharge permit · NPDES WY0035271
LITTLE GRASS CREEK UNIT TANK BATTERY #1, WY: NPDES WY0035271 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
LITTLE GRASS CREEK UNIT TANK BATTERY #1, held by Valkyrie Operating, LLC, holds NPDES permit WY0035271. EPA’s file records it issued August 30, 2016 and expiring October 31, 2021. 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 | LITTLE GRASS CREEK UNIT TANK BATTERY #1 |
|---|---|
| Permittee as filed | Valkyrie Operating, LLC |
| NPDES ID | WY0035271 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | August 30, 2016 |
| Expiration date | October 31, 2021 |
| Issuing agency | WDEQ |
| Address | WY |
| Subwatershed | Gillies Draw-Gooseberry Creek (HUC 100800070707) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 8Pollutants on file
- 8Under a numeric limit
- 8With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| Radium 226, total | 6 | 18 | 2 | June 30, 2015 | 42% over the limit |
| Specific conductance | 3 | 5 | 1 | December 31, 2013 | 9% over the limit |
| Flow | 12 | 48 | 0 | ||
| pH | 18 | 36 | 0 | ||
| Sulfide, total [as S] | 12 | 31 | 0 | ||
| Produced water, oil and grease | 6 | 14 | 0 | ||
| Chloride | 3 | 4 | 0 | ||
| Sulfate | 3 | 4 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES WY0035271.
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 WY0035271 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.