Clean Water Act discharge permit · NPDES WY0025071
NORTH TISDALE FIELD, (Unknown City), WY: NPDES WY0025071 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
NORTH TISDALE FIELD, held by Simon Oil, holds NPDES permit WY0025071. EPA’s file records it issued March 1, 2021 and expiring December 31, 2025. 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 | NORTH TISDALE FIELD |
|---|---|
| Permittee as filed | Simon Oil |
| NPDES ID | WY0025071 |
| 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 | March 1, 2021 |
| Expiration date | December 31, 2025 |
| Issuing agency | Wyoming Department of Environmental Quality |
| Address | (Unknown City), WY |
| Subwatershed | Wall Creek-South Fork Powder River (HUC 100902030404) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 8Pollutants on file
- 7Under a numeric limit
- 8With 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 |
|---|---|---|---|---|---|
| Produced water, oil and grease | 2 | 37 | 7 | June 30, 2025 | 270% over the limit |
| pH | 4 | 21 | 1 | December 31, 2013 | |
| Radium 226 + radium 228, total | 2 | 1 | 1 | December 31, 2024 | 61% over the limit |
| Flow | 4 | 120 | 0 | ||
| Sulfate, total [as SO4] | 2 | 12 | 0 | ||
| Chloride | 2 | 12 | 0 | ||
| Radium 226, total | 0 | 12 | 0 | ||
| Specific conductance | 2 | 10 | 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
- 8Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 22, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| June 1, 2017 | Effluent Violations - Numeric effluent violation | ST6 |
| May 18, 2017 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| May 17, 2017 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| May 17, 2017 | Permit Violations - Violation Specified in Comment | ST6 |
| May 17, 2017 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| May 16, 2017 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| May 16, 2017 | Permit Violations - Violation Specified in Comment | 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.
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 WY0025071 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.