Clean Water Act discharge permit · NPDES MO0126594

SCCPWSD#2, BOONE RIDGE ESTATES WWTF, Wentzville, MO: NPDES MO0126594 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
9Pollutants under a numeric limit
9Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

SCCPWSD#2, BOONE RIDGE ESTATES WWTF, held by PWSD #2 of St. Charles County, holds NPDES permit MO0126594, which discharges to Tributary To Peruque Creek. EPA’s file records it issued August 16, 2016 and expiring March 31, 2020.

SCCPWSD#2, BOONE RIDGE ESTATES WWTF, Wentzville, Missouri: Individual permit MO0126594, held by PWSD #2 of St. Charles County; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued August 16, 2016, term to March 31, 2020; discharges to Tributary to Peruque Creek.

Nitrogen, ammonia total [as N]: 8 limits, 2 violations of any kind, 2 effluent exceedances, latest June 30, 2017, largest 49% over the limit.
BOD, 5-day, 20 deg. C: 3 limits, 2 violations of any kind, 2 effluent exceedances, latest March 31, 2025, largest 220% over the limit.
Ammonia [as N] + unionized ammonia: 0 limits, 2 violations of any kind, 2 effluent exceedances, latest July 31, 2013, largest 162% over the limit.
Coliform, fecal general: 0 limits, 2 violations of any kind, 2 effluent exceedances, latest September 30, 2013, largest 670% over the limit.
Solids, total suspended: 3 limits, 1 violation of any kind, 1 effluent exceedance, latest March 31, 2025, largest 96% over the limit.
pH: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest September 30, 2008.
E. coli: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2020, largest 511% over the limit.
BOD, 5-day, percent removal: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest March 31, 2025, largest 40% over the limit.
Solids, suspended percent removal: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest December 31, 2025, largest 21% over the limit.
Oil and grease [soxhlet extr.] tot.: 2 limits, 2 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 2 limits, 0 violations of any kind, 0 effluent exceedances.
Toxicity [acute], Ceriodaphnia dubia: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Toxicity [acute], Pimephales promelas [Fathead Minnow]: 1 limit, 0 violations of any kind, 0 effluent exceedances.

Missouri holds 756 Publicly owned treatment works coverages of this permit type in EPA’s file; 112 were issued before MO0126594. PWSD #2 of St. Charles County holds 4 permits in Missouri.

Other permits held by PWSD #2 of St. Charles County

SCCPWSD #2 NEW MELLE WWTP, New Melle: MO0115461, issued May 24, 2017
PWSD #2 OF ST. CHARLES COUNTY, O'Fallon: MOL115461, issued January 1, 2021
PWSD #2 OF ST. CHARLES COUNTY, O'Fallon: MOL126594, issued January 1, 2021

Coverages issued nearest MO0126594

August 3, 2016: CLEVELAND WWTF, Cleveland, MO0111287, held by City of Cleveland
August 3, 2016: PIKE CREEK SEWER DISTRICT WWTF, Poplar Bluff, MO0124427, held by Pike Creek Reorganized Common Sewer
August 9, 2016: LOUISIANA WWTP, Louisiana, MO0023124, held by City of Louisiana
August 9, 2016: VANDUSER WWTF, Vanduser, MO0122599, held by Village of Vanduser
August 16, 2016: ORAN WWTF, Oran, MO0043532, held by City of Oran
August 18, 2016: MAITLAND WWTF, Maitland, MO0032174, held by City of Maitland
August 18, 2016: PCPWSD NO. 2 SUMMER FIELD SUBD WWTP, Rolla, MO0125482, held by Phelps Co. PWSD # 2
August 23, 2016: MAWC, SMITHTON WWTF, Smithton, MO0025828, held by City of Smithton
August 23, 2016: BENTON WWTF, Benton, MO0055182, held by City of Benton
August 23, 2016: NIANGUA WWTP, Niangua, MO0095109, held by City of Niangua

SCCPWSD#2, BOONE RIDGE ESTATES WWTF among its neighbors

EPA’s permit file holds 158 discharge permits in the Headwaters Peruque Creek subwatershed (HUC 071100090101), MO0126594 among them. Its county holds 774, 9 of them major permits; MO0126594 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 filed	SCCPWSD#2, BOONE RIDGE ESTATES WWTF
Permittee as filed	PWSD #2 of St. Charles County
NPDES ID	MO0126594
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	August 16, 2016
Expiration date	March 31, 2020
Address	Wentzville, MO 63385
Receiving water	Tributary to Peruque Creek
Receiving water impaired	303(D) Listed
Subwatershed	Headwaters Peruque Creek (HUC 071100090101)
Program components on file	Biosolids, POTW
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

13Pollutants on file
9Under a numeric limit
10With a violation of any kind
9With 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
Nitrogen, ammonia total [as N]	8	2	2	June 30, 2017	49% over the limit
BOD, 5-day, 20 deg. C	3	2	2	March 31, 2025	220% over the limit
Ammonia [as N] + unionized ammonia	0	2	2	July 31, 2013	162% over the limit
Coliform, fecal general	0	2	2	September 30, 2013	670% over the limit
Solids, total suspended	3	1	1	March 31, 2025	96% over the limit
pH	2	1	1	September 30, 2008
E. coli	2	1	1	May 31, 2020	511% over the limit
BOD, 5-day, percent removal	0	1	1	March 31, 2025	40% over the limit
Solids, suspended percent removal	0	1	1	December 31, 2025	21% over the limit
Oil and grease [soxhlet extr.] tot.	2	2	0
Flow, in conduit or thru treatment plant	2	0	0
Toxicity [acute], Ceriodaphnia dubia	1	0	0
Toxicity [acute], Pimephales promelas [Fathead Minnow]	1	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MO0126594.

Inspections

EPA’s inspection file holds no inspection for NPDES MO0126594.

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 MO0126594.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MO0126594.

Start the watch

How we handle your data → Privacy

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES MO0126594 for SCCPWSD#2, BOONE RIDGE ESTATES WWTF in Wentzville, MO, held by PWSD #2 of St. Charles County and listed as administratively continued. The page lists 9 pollutants under a numeric limit and 9 pollutants with an effluent exceedance, within the Headwaters Peruque Creek subwatershed (HUC 071100090101).