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Clean Water Act discharge permit · NPDES MO0057801

SCCPWSD#2, CASTLEGATE MHP AND PROVIDENCE, Wentzville, MO: NPDES MO0057801 discharge permit, effluent exceedances, inspections, penalties

SCCPWSD#2, CASTLEGATE MHP AND PROVIDENCE, held by PWSD No. 2 of St. Charles County, holds NPDES permit MO0057801, which discharges to Tributary To Peruque Cr.. EPA’s file records it issued January 18, 2023 and expiring March 31, 2025.

SCCPWSD#2, CASTLEGATE MHP AND PROVIDENCE, Wentzville, Missouri: Individual permit MO0057801, held by PWSD No. 2 of St. Charles County; Publicly owned treatment works; Effective; issued January 18, 2023, term to March 31, 2025; discharges to Tributary to Peruque Cr..

  • Nitrogen, ammonia total [as N]: 18 limits, 23 violations of any kind, 9 effluent exceedances, latest July 31, 2021, largest 433% over the limit.
  • E. coli: 2 limits, 3 violations of any kind, 3 effluent exceedances, latest September 30, 2023, largest 323% over the limit.
  • BOD, 5-day, 20 deg. C: 3 limits, 2 violations of any kind, 2 effluent exceedances, latest June 30, 2020, largest 108% over the limit.
  • Chlorine, total residual: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest September 30, 2016, largest 63% over the limit.
  • pH: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest September 30, 2015.
  • BOD, 5-day, percent removal: 1 limit, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2023, largest 7% over the limit.
  • Solids, total suspended: 3 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oil and grease [soxhlet extr.] tot.: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Solids, suspended percent removal: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • September 4, 2026: Effluent Violations - Numeric effluent violation (ST6).
  • September 4, 2026: Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) (ST6).
  • September 4, 2026: Reporting Violations - Improper/ Incorrect Reporting (ST6).
  • September 4, 2026: Permit Violations - Violation Specified in Comment (ST6).
  • August 10, 2026: Evaluation (S).

Missouri holds 756 Publicly owned treatment works coverages of this permit type in EPA’s file; 725 were issued before MO0057801.

Coverages issued nearest MO0057801

SCCPWSD#2, CASTLEGATE MHP AND PROVIDENCE among its neighbors

EPA’s permit file holds 158 discharge permits in the Headwaters Peruque Creek subwatershed (HUC 071100090101), MO0057801 among them. Its county holds 774, 9 of them major permits; MO0057801 is a minor permit.

Other permits in the Headwaters Peruque Creek subwatershed (HUC 071100090101)

  • ALPHA FOUNDRY COMPANY, Wright City: MOR203311, minor permit, discharging to Tributary to Peruque Creek, permit term to August 31, 2024
  • AMERICA'S HEARTLAND PACKING, Wright City: MONX00963, minor permit, permit term to November 30, 2029
  • AMERICAN FOOD GROUP, Foristell: MORA21885, minor permit, discharging to Peruque Cr., permit term to February 7, 2027
  • AMERICAN FOOD GROUP, Wright City: MORA27489, minor permit, discharging to Tributary to Peruque Cr., permit term to February 7, 2027
  • ARBOR VALLEY, Wentzville: MORA20232, minor permit, discharging to Tributary to Peruque Cr., permit term to February 7, 2027
  • AUDEN HOLLOW, Wentzville: MORA22051, minor permit, discharging to Tributary to Peruque Cr., permit term to February 7, 2027
  • AVENTURA AT HAWK RIDGE, Lake Saint Louis: MORA19813, minor permit, permit term to February 7, 2027
  • AVENTURA AT WENTZVILLE II, Wentzville: MORA26384, minor permit, discharging to Tributary to Lake Sainte Louise, permit term to February 7, 2027
  • AVTASK, Wright City: MORA28523, minor permit, discharging to Tributary to Peruque Creek, permit term to February 7, 2027
  • BLASTCO, Wentzville: MOR203546, minor permit, discharging to Tributary to Dardenne Cr., permit term to September 9, 2029

Identity

Facility as filedSCCPWSD#2, CASTLEGATE MHP AND PROVIDENCE
Permittee as filedPWSD No. 2 of St. Charles County
NPDES IDMO0057801
Permit statusEffective
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJanuary 18, 2023
Expiration dateMarch 31, 2025
AddressWentzville, MO 63385
Receiving waterTributary to Peruque Cr.
SubwatershedHeadwaters Peruque Creek (HUC 071100090101)
Program components on fileBiosolids, POTW
SIC4952 – Sewerage Systems

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]18239July 31, 2021433% over the limit
E. coli233September 30, 2023323% over the limit
BOD, 5-day, 20 deg. C322June 30, 2020108% over the limit
Chlorine, total residual222September 30, 201663% over the limit
pH211September 30, 2015
BOD, 5-day, percent removal111May 31, 20237% over the limit
Solids, total suspended300
Oxygen, dissolved [DO]200
Oil and grease [soxhlet extr.] tot.200
Flow, in conduit or thru treatment plant200
Solids, suspended percent removal100

Inspections, violations and enforcement

DateWhat EPA recordedAgency
September 4, 2026Effluent Violations - Numeric effluent violationST6
September 4, 2026Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
September 4, 2026Reporting Violations - Improper/ Incorrect ReportingST6
September 4, 2026Permit Violations - Violation Specified in CommentST6

Inspections

DateWhat EPA recordedAgency
August 10, 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 MO0057801.

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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 MO0057801 for SCCPWSD#2, CASTLEGATE MHP AND PROVIDENCE in Wentzville, MO, held by PWSD No. 2 of St. Charles County, with an Effective permit status and a Minor Discharger class. The page lists 11 pollutants under a numeric limit and 6 pollutants with an effluent exceedance, with the permit recorded as issued January 18, 2023 and expiring March 31, 2025.