Clean Water Act discharge permit · NPDES MO0113743

RSD, LASALLE SPRINGS MIDDLE SCHOOL WWTF, Wildwood, MO: NPDES MO0113743 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
8Pollutants under a numeric limit
8Pollutants with an effluent exceedance

RSD, LASALLE SPRINGS MIDDLE SCHOOL WWTF, held by Rockwood School District, holds NPDES permit MO0113743, which discharges to Hamilton Creek. EPA’s file records it issued June 6, 2017 and expiring June 30, 2022. 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 filed	RSD, LASALLE SPRINGS MIDDLE SCHOOL WWTF
Permittee as filed	Rockwood School District
NPDES ID	MO0113743
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
Program	Biosolids
Issued	June 6, 2017
Expiration date	June 30, 2022
Address	Wildwood, MO 63038
Receiving water	Hamilton Creek
Subwatershed	Hamilton Creek-Meramec River (HUC 071401021001)
SIC	8211 – Elementary And Secondary Schools

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

11Pollutants on file
8Under a numeric limit
11With a violation of any kind
8With 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
pH	2	25	11	September 30, 2024
Nitrogen, ammonia total [as N]	4	24	10	March 31, 2026	416% over the limit
Chlorine, total residual	2	17	9	August 31, 2016	69,900% over the limit
Ammonia [as N] + unionized ammonia	0	9	9	February 28, 2017	1,621% over the limit
Solids, total suspended	2	19	4	February 28, 2007	67% over the limit
E. coli	2	10	2	June 30, 2018	1,820% over the limit
BOD, 5-day, percent removal	0	1	1	December 31, 2025	567% over the limit
Solids, suspended percent removal	0	1	1	December 31, 2025	567% over the limit
BOD, 5-day, 20 deg. C	2	15	0
Flow, in conduit or thru treatment plant	2	14	0
Oxygen, dissolved [DO]	2	8	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
May 1, 2026	Effluent Violations - Numeric effluent violation	ST6
August 28, 2025	Effluent Violations - Numeric effluent violation	ST6
March 31, 2025	Effluent Violations - Numeric effluent violation	ST6
July 9, 2024	Effluent Violations - Numeric effluent violation	ST6
April 3, 2024	Effluent Violations - Numeric effluent violation	ST6
April 4, 2023	Effluent Violations - Numeric effluent violation	ST6
June 30, 2022	Effluent Violations - Numeric effluent violation	ST6
October 15, 2021	Reporting Violations - Failure to Submit DMRs	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.

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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 MO0113743 there.

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 MO0113743 for RSD, LASALLE SPRINGS MIDDLE SCHOOL WWTF in Wildwood, MO, held by Rockwood School District and discharging to Hamilton Creek. The page lists the permit as administratively continued with a Minor Discharger class, with 8 pollutants under a numeric limit and 8 pollutants with an effluent exceedance. The permit was issued June 6, 2017 and had an expiration date of June 30, 2022.