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Clean Water Act discharge permit · NPDES WY0095877

EAST TISDALE FIELD, MORTON LEASE (NEW 2016), (Unknown City), WY: NPDES WY0095877 discharge permit, effluent exceedances, inspections, penalties

EAST TISDALE FIELD, MORTON LEASE (NEW 2016), held by Simon Oil, holds NPDES permit WY0095877. EPA’s file records it issued October 26, 2021 and expiring April 30, 2026.

EAST TISDALE FIELD, MORTON LEASE (NEW 2016), (Unknown City), Wyoming: Individual permit WY0095877, held by Simon Oil; Administratively continued (past its expiration date and still in force until reissued); issued October 26, 2021, term to April 30, 2026, by WDEQ.

  • Produced water, oil and grease: 2 limits, 24 violations of any kind, 9 effluent exceedances, latest December 31, 2025, largest 140% over the limit.
  • Flow: 4 limits, 58 violations of any kind, 0 effluent exceedances.
  • pH: 4 limits, 38 violations of any kind, 0 effluent exceedances.
  • Sulfide, total [as S]: 4 limits, 32 violations of any kind, 0 effluent exceedances.
  • Specific conductance: 1 limit, 5 violations of any kind, 0 effluent exceedances.
  • Radium 226, total: 1 limit, 5 violations of any kind, 0 effluent exceedances.
  • Chloride: 1 limit, 5 violations of any kind, 0 effluent exceedances.
  • Sulfate: 1 limit, 5 violations of any kind, 0 effluent exceedances.
  • June 16, 2026: Evaluation (S).
  • June 1, 2017: Permit Violations - Violation Specified in Comment (ST6).
  • June 1, 2017: Permit Violations - Unapproved Operation (ST6).
  • May 18, 2017: Management Practice Violations - Failure to Maintain Records (ST6).
  • May 18, 2017: Reporting Violations - Improper/ Incorrect Reporting (ST6).

Other permits held by Simon Oil

EAST TISDALE FIELD, MORTON LEASE (NEW 2016) among its neighbors

EPA’s permit file holds 2 discharge permits in the Wall Creek-South Fork Powder River subwatershed (HUC 100902030404), WY0095877 among them. Its county holds 35, 0 of them major permits; WY0095877 is a minor permit.

Other permits in the Wall Creek-South Fork Powder River subwatershed (HUC 100902030404)

Identity

Facility as filedEAST TISDALE FIELD, MORTON LEASE (NEW 2016)
Permittee as filedSimon Oil
NPDES IDWY0095877
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedOctober 26, 2021
Expiration dateApril 30, 2026
Issuing agencyWDEQ
Address(Unknown City), WY
SubwatershedWall Creek-South Fork Powder River (HUC 100902030404)

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Produced water, oil and grease2249December 31, 2025140% over the limit
Flow4580
pH4380
Sulfide, total [as S]4320
Specific conductance150
Radium 226, total150
Chloride150
Sulfate150

Inspections, violations and enforcement

DateWhat EPA recordedAgency
June 1, 2017Permit Violations - Violation Specified in CommentST6
June 1, 2017Permit Violations - Unapproved OperationST6
May 18, 2017Management Practice Violations - Failure to Maintain RecordsST6
May 18, 2017Reporting Violations - Improper/ Incorrect ReportingST6

Inspections

DateWhat EPA recordedAgency
June 16, 2026EvaluationS

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES WY0095877.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers NPDES permit WY0095877 for East Tisdale Field, Morton Lease (New 2016), held by Simon Oil, which is administratively continued and was issued October 26, 2021 with an expiration date of April 30, 2026. The page lists 8 pollutants on file, all 8 under a numeric limit, with 1 pollutant showing an effluent exceedance and 8 pollutants carrying a violation of any kind.