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Clean Water Act discharge permit · NPDES MO0132527

OAK BROOK ESTATES WWTP, Walnut Shade, MO: NPDES MO0132527 discharge permit, effluent exceedances, inspections, penalties

OAK BROOK ESTATES WWTP, held by Oakbrook HOA, holds NPDES permit MO0132527, which discharges to Tributary To Bear Cr.. EPA’s file records it issued October 8, 2014 and expiring September 30, 2019. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedOAK BROOK ESTATES WWTP
Permittee as filedOakbrook HOA
NPDES IDMO0132527
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 8, 2014
Expiration dateSeptember 30, 2019
AddressWalnut Shade, MO 65771
Receiving waterTributary to Bear Cr.
SubwatershedBear Creek (HUC 110100030106)
SIC4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

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
Nitrogen, ammonia total [as N]64333June 30, 20261,246% over the limit
Phosphorus, total [as P]12815June 30, 2026700% over the limit
E. coli22315September 30, 202599,999% over the limit
Solids, total suspended2142March 31, 2021106% over the limit
BOD, 5-day, 20 deg. C2131March 31, 202138% over the limit
pH2131March 31, 2021
Aluminum, total recoverable2100
Flow, in conduit or thru treatment plant2100
Iron, total recoverable240

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

DateWhat EPA recordedAgency
September 14, 2026Effluent Violations - Numeric effluent violationST6
March 16, 2026Effluent Violations - Numeric effluent violationST6
December 16, 2025Effluent Violations - Numeric effluent violationST6
September 18, 2024Effluent Violations - Numeric effluent violationST6
September 19, 2022Effluent Violations - Numeric effluent violationST6
March 21, 2022Reporting Violations - Failure to Submit DMRsST6
March 26, 2021Effluent Violations - Numeric effluent violationST6
December 23, 2020Effluent Violations - Numeric effluent violationST6
February 6, 2019Permit Violations - Violation Specified in CommentST6
February 6, 2019Management Practice Violations - Improper Operation and MaintenanceST6
December 27, 2017Effluent Violations - Numeric effluent violationST6
November 6, 2017Permit Violations - Violation Specified in CommentST6
October 13, 2017WW SSO - Failure to report violation that may endanger public health 122.41(l)(7)ST6

Inspections

EPA’s inspection file holds no inspection for NPDES MO0132527.

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 MO0132527.

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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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 MO0132527 there.

OAK BROOK ESTATES WWTP, Walnut Shade, Missouri: Individual permit MO0132527, held by Oakbrook HOA; Administratively continued (past its expiration date and still in force until reissued); issued October 8, 2014, term to September 30, 2019; discharges to Tributary to Bear Cr..

  • Nitrogen, ammonia total [as N]: 6 limits, 43 violations of any kind, 33 effluent exceedances, latest June 30, 2026, largest 1,246% over the limit.
  • Phosphorus, total [as P]: 1 limit, 28 violations of any kind, 15 effluent exceedances, latest June 30, 2026, largest 700% over the limit.
  • E. coli: 2 limits, 23 violations of any kind, 15 effluent exceedances, latest September 30, 2025, largest 99,999% over the limit.
  • Solids, total suspended: 2 limits, 14 violations of any kind, 2 effluent exceedances, latest March 31, 2021, largest 106% over the limit.
  • BOD, 5-day, 20 deg. C: 2 limits, 13 violations of any kind, 1 effluent exceedance, latest March 31, 2021, largest 38% over the limit.
  • pH: 2 limits, 13 violations of any kind, 1 effluent exceedance, latest March 31, 2021.
  • Aluminum, total recoverable: 2 limits, 10 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 2 limits, 10 violations of any kind, 0 effluent exceedances.
  • Iron, total recoverable: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • September 14, 2026: Effluent Violations - Numeric effluent violation (ST6).
  • March 16, 2026: Effluent Violations - Numeric effluent violation (ST6).
  • December 16, 2025: Effluent Violations - Numeric effluent violation (ST6).
  • September 18, 2024: Effluent Violations - Numeric effluent violation (ST6).
  • September 19, 2022: Effluent Violations - Numeric effluent violation (ST6).
  • March 21, 2022: Reporting Violations - Failure to Submit DMRs (ST6).
  • March 26, 2021: Effluent Violations - Numeric effluent violation (ST6).
  • December 23, 2020: Effluent Violations - Numeric effluent violation (ST6).
  • February 6, 2019: Permit Violations - Violation Specified in Comment (ST6).
  • February 6, 2019: Management Practice Violations - Improper Operation and Maintenance (ST6).
  • December 27, 2017: Effluent Violations - Numeric effluent violation (ST6).
  • November 6, 2017: Permit Violations - Violation Specified in Comment (ST6).
  • October 13, 2017: WW SSO - Failure to report violation that may endanger public health 122.41(l)(7) (ST6).

OAK BROOK ESTATES WWTP among its neighbors

EPA’s permit file holds 2 discharge permits in the Bear Creek subwatershed (HUC 110100030106), MO0132527 among them. Its county holds 264, 3 of them major permits; MO0132527 is a minor permit.

Other permits in the Bear Creek subwatershed (HUC 110100030106)

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers NPDES permit MO0132527 for the OAK BROOK ESTATES WWTP in Walnut Shade, MO, held by Oakbrook HOA and discharging to Tributary To Bear Cr. The permit is administratively continued and classed as a Minor Discharger, with 9 pollutants on file, 6 of them under a numeric limit and 6 showing an effluent exceedance.