Improving Our Community Waterways Together!

Rain Garden at Employment OfficeRain Garden at Employment Office

Green 101

Green infrastructure (or practices) manages and treats stormwater on-site. It utilizes natural or engineered systems—which mimic natural processes—allowing rainwater to soak into the soil before reaching drainage or combined sewer systems. Green installations naturally filter pollutants, providing additional waterway protection.

MSD’s Green Infrastructure Program locates, builds or incentivizes opportunities for green installations, furnishing stream protection at lesser costs than conventional gray infrastructure like storage tanks, large pipes and treatment facilities. By strategically implementing green infrastructure, MSD increases rainwater absorption into the soil and reduces the amount of rainwater entering combined sewers, thus decreasing treatment facility stress and sewer overflows. These cost-effective solutions save MSD ratepayers money and improve local waterway quality.

Green infrastructure solutions include vegetated roofs; rain gardens and barrels; green roads and alleys; pervious pavement sidewalks and parking; and bio-retention basins. MSD offers partnership incentives for qualified green infrastructure projects, and Downspout Disconnection and Urban Reforestation programs.

Green Infrastructure Design Manual

The Green Infrastructure Design Manual is chapter 18 of the MSD Design Manual. This chapter of the manual includes guidance on designing, constructing and inspecting green infrastructure.

Click here to view the manual.

Click below to view Maintenance Inspection forms:

Bioswales & Rain Gardens

Catch Basin Insert & Proprietary Water Quality Unit

Constructed Wetlands

Green Roof/Blue Roof

Green Wet/Green Dry Basins

Infiltration Drains

Permeable Pavers

Pervious Asphalt

Pervious Concrete


Rain Harvesting Underground Storage

Tree Boxes

Vegetated Buffers & Vegetated Swales

Municipal Separate Storm Sewer System Program and Annual Report

The Municipal Separate Storm Sewer System (MS4) Program benefits the water quality of waterways located in Jefferson County. The MS4 Permit defines the requirements for improvement in water quality, outside of the combined sewer system, by pollution prevention and green infrastructure. The MS4 Annual Report outlines the activities which document MSD's permit compliance.

Click here to view the Annual Report

Click here for the permit

Integrated Overflow Abatement Plan

The Integrated Overflow Abatement Plan (IOAP), which has been developed under Project WIN and approved by the EPA and the Kentucky Division of Water, is a long-term plan for controlling combined sewer overflows, and for mitigating sanitary sewer overflows and other unauthorized discharges from MSD’s sewer system. The implementation of the IOAP, will help MSD reach its Mission of achieving clean, safe waterways for a healthy and vibrant community. read more