Maintenance Responsibilities

Maintenance Responsibilities

Annual BMP Maintenance Report

To ensure that the maintenance of privately owned stormwater management facilities is conducted per the BMP Maintenance Agreement and the Stormwater Management Facilities Report (SWMFR), MSD requires that an Annual BMP Maintenance Report is submitted to the District for all commercial and residential homeowner association maintained facilities. The annual report should provide documentation that maintenance was performed in accordance with the Stormwater Management Facilities Report submitted to and approved by MSD for the development project. To avoid compliance enforcement actions, the Annual BMP Maintenance Report should be submitted no later than March 31st following the reporting year. An MSD inspector will also periodically inspect the BMP.

NEW FOR THE 2020 REPORT YEAR – annual reports can now be submitted online. The online form is the most convenient and consistent option available for property owners to comply with the annual report requirement. As in previous years, MSD will also accept reports submitted by email or by mail.  Annual Reports for 2020 are due by March 31, 2021.

BMPs that are located on a homeowner’s lot(s) and that are not maintained by a homeowner association are not required to submit an annual report. However, a MSD inspector will periodically inspect the BMP.

Submitting Annual Reports Online

Access the online form by the clicking the button below. Submit one form for each stormwater BMP asset under the required project number. Most projects include more than one BMP, and as a result, will require multiple forms be submitted. The forms are easy to complete, and certain owner fields will autofill after the first form for each project is submitted. The Annual BMP Maintenance Report is considered complete after all BMPs under a required development project have been reported on.

For each form that is submitted, a confirmation email with a copy of the completed form is sent to email addresses of the owner and owner’s designated  contact as provided on the form. Owner contact information entered on the form will be kept on file and used by MSD to distribute future correspondence related to annual BMP reporting and maintenance. Download the list of projects and their respective assets which require an online form here:

2020 Annual Report – Required Projects and Assets (PDF)

2020 Annual Report – Required Projects and Assets (Excel)

Submitting Annual Reports by Email or Mail

The Annual Report should consist of a completed inspection checklist and/or maintenance log, narrative description of corrective action measures taken, photographs, and any other documentation appropriate for demonstrating compliance with the BMP Maintenance Agreement and your SWMFR. In the Annual Report, also provide the current property owner’s name, address, phone, and other relevant contact information.

For consistency and for your convenience, MSD has developed an Annual BMP Maintenance Report Form and BMP Inspection Checklists. The report form and the inspection checklists are not mandatory for use by BMP owners, and are being provided as templates to ensure compliance with minimal maintenance requirements. Links to both can be found be on this page. Use of the inspection checklists provided here, will not exempt BMP owners from design and maintenance requirements specified in the SWMFR. If the system in place is a proprietary system, please contact the manufacturer for the inspection checklist for the specific system.

MSD does not have a preferred BMP vendor list for BMP inspections, maintenance and/or annual reporting.

Submit your Annual Report by email to, or by mail to:

Metropolitan St. Louis Sewer District
Division of Environmental Compliance
c/o Phase II Stormwater Management Program
10 E. Grand Avenue
St. Louis, MO 63147

BMP Maintenance Education Resources

As a service to all BMP owners, MSD provides education on BMP maintenance and ownership requirements. Information about future educational workshops will be posted here as soon as they are scheduled for 2021. Please contact MSD’s Division of Environmental Compliance at (314) 436-8758 for more information.

MSD’s Stormwater BMP Mapviewer was developed to assist owners and those responsible for maintenance and reporting to more easily locate and identify BMP facilities on their project sites.  The Mapviewer should be used to identify Project/Record numbers and BMP asset numbers for completing online annual report forms.

Annual BMP Maintenance Report

Post-Construction Stormwater BMP Annual Maintenance Report Form

BMP Ownership and Maintenance

BMP Ownership and Maintenance Brochure
Porous Pavement Ownership and Maintenance Brochure
Rain Garden Ownership and Maintenance Brochure
Planter Box Ownership and Maintenance Brochure
Rain Garden and Planter Box Maintenance Video (YouTube)

BMP Inspection Checklists

Bioretention/Rain Garden
Permeable Pavement
Detention or Retention Pond/Basin
Infiltration Basin/Trench
Underground Detention
Amended Soils
Green Roof
Cistern/Dry Well/Rain Barrel
Storm Credit – Open Channel
Storm Credit – Sheet Flow to Buffer
Storm Credit – Natural Area Conservation
Storm Credit – Impervious Area Disconnection

Hydrodynamic Separator Unit

For questions related to post-construction stormwater BMP maintenance and/or BMP ownership requirements please contact MSD’s Division of Environmental Compliance at (314) 436-8758.

Proprietary BMP Manufacturer’s Operation and Maintenance Guides

Hydrodynamic Separator Unit – Contech CDS Maintenance Guide
Hydrodynamic Separator Unit – Contech Vortechs Maintenance Guide
Hydrodynamic Separator Unit – Contech VortSentry VS Maintenance Guide
Hydrodynamic Separator Unit – Contech VortSentry HS Maintenance Guide
Hydrodynamic Separator Unit – Hydro International Downstream Defender Maintenance Guide
Proprietary BMP Filter – Contech StormFilter Maintenance Guide
Proprietary BMP Filter – Hydro International UpFlow Filter Maintenance Guide

Operation and Maintenance Plan

Operation and Maintenance Plan Guidance
Operation and Maintenance Plan Template
Change of Ownership Form

Operation and Maintenance Plan Revisions — Minor revisions may include, but are not limited, a change in property owner, change in specifics of O&M schedule, change in maintenance procedures or contact. Minor revisions shall be submitted to MSD — Division of Environmental Compliance, Attn: Stormwater Management Program, 10 E. Grand Avenue, St. Louis, MO 63147. These minor revisions are not subject to MSD’s development review process. Major Revisions are changes that will alter the stormwater BMPs design or operation from the original approved Design Report (i.e. BMP type, location, capacity, change in media composition, or other structural components), specifically the operation or performance of the system is being altered by a maintenance activity or repair. Major revisions are subject to MSD’s development review process and shall be submitted to MSD — Engineering Department, Attn: Development Review, 2350 Market Street, St. Louis, MO 63103.