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Infill Development Stormwater Regulations

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For many years the City of Kirkwood has been a popular community for residential and commercial development in the St. Louis area. Land development permanently alters the way in which stormwater flows across a site due to grading, compaction, and the installation of impervious cover. In an attempt to reduce these impacts, the City of Kirkwood requires stormwater management measures be utilized on major development projects in accordance with Municipal Code Chapter 5, Article VI Infill Development Storm Water Management. These regulations are in addition to the requirements of the Metropolitan St. Louis Sewer District (MSD). 

These measures aim to reduce the amount of runoff created by development through Green Infrastructure, also known as  stormwater BMPs. The City acknowledges these regulations will not solve all stormwater related issues within the City; however, this is a reasonable effort to reduce impacts of development on stormwater.

Applicable projects meeting or exceeding the thresholds for impervious area in the ordinance will be required to provide stormwater BMPs to treat the increased runoff.  The City has developed a guidance manual to assist property owners with selecting, sizing, and locating the necessary BMPs, as well standard details for installation.  For more information about the regulations please contact Asst. City Engineer Rick Holesinger at 314-822-5819 or search the sections below.

Applicable Projects

Regulated Infill Development subject to review for stormwater management in accordance with Chapter 5, Article VI Infill Development Storm Water Management include, but is not limited to:

  • New Construction and Redevelopment
  • Building Additions
  • Accessory Structures
  • Swimming Pools
  • Driveway Expansions or Additions 

MSD Review

All commercial and multi-family projects or any project disturbing 1 acre or more are required to submit development plans to the Metropolitan St. Louis Sewer District (MSD). The City may also require MSD review of residential projects with any of the following conditions. 

MSD Conditions for Review 

Stormwater Management Requirements 

Regulated Infill Development with the following conditions are required to provide stormwater management techniques in compliance with Chapter 5, Article VI Infill Development Storm Water Management:

  1. Developments creating 1,000 square feet or more of net additional impervious area.
  2. Developments causing the total impervious area on a lot to be greater than 25% of the total lot area.

Projects with stormwater BMPs required by MSD will not be subject to the above requirements. Projects requiring stormwater BMPs by the City of Kirkwood will be required to record a BMP Maintenance Agreement along with the approved site plan at the St. Louis County Recorder of Deeds office.

Inspections 

The City will inspect the BMP's during construction and provide maintenance inspections at the following intervals:

  • 1 year post construction
  • Every 3 years
  • At change of occupancy

Maintenance of the BMPs is the responsibility of the property owner.

Fees and Escrows

No additional permit fees are required.  A $1,000 construction deposit is required for projects that don't require the $5,000 site restoration deposit.   

Stormwater Guidance Manual and Checklists 

The City has developed the following manuals and checklists to aid property owners in the design, installation and maintenance of required stormwater BMPs.  

Sump Pumps 

All projects which include the installation of sump pumps or existing sump pumps with discharges causing a nuisance per Chapter 16 Section 2 of the Kirkwood Code of Ordinances must discharge to one of the following BMPs per the Infill Development Storm Water Guidance Document:

  1. Drywell sized to treat a minimum of 175 square feet of contributing area and located a minimum of 10’ from any property line, or
  2. Vegetated filter strip sized to treat a minimum of 175 square feet of contributing area and sump pump discharge located a minimum of 20’ from any property line

These are minimum requirements and property owners are encouraged to engage professionals to adequately size their systems. If a nuisance develops or continues to exist, the homeowner will be required to correct the issue.