Storm Water Management


Storm water management is a critical part of keeping our water safe and clean and curtailing flooding.

It's not just a job for government or large construction sites; we all can help keep the water clean by following rules, avoiding pollutants and making sure our water goes where it is supposed to when it rains.

In Mt. Lebanon, we have what's called a municipal separate storm sewer system (also called MS4 for short). That means our storm water doesn't go down the same drains as sewage from our bathrooms, kitchens and laundry rooms.

To help keep our system clean, we will post tips for residents on this page. Some of the tips might not seem water related -- such as curtailing use of lawn fertilizers or rock salt for icy sidewalks. Even properly raking leaves keeps catch basins clear and free to do their work. This page also will list capital projects that upgrade our infrastructure. Storm water fee information is listed to the left.

Storm Water Management Ordinance:



In October, 2020, the Mt. Lebanon Commission approved an ordinance stating that, beginning in 2021, newly installed sump pumps must direct water discharges into the storm sewer system when possible, or onto absorbent surfaces, such as grass, mulch or soil, or a sump pit, to ensure that water does not find its way onto the street or onto neighboring properties. Property owners need a permit for a sump pump, and owners must be able to demonstrate that the water will discharge more than 10 feet from the property line and the municipal right of way.

Existing sump pumps that continue to pose a problem need to be brought into compliance with the new ordinance. Property owners are to assume the cost. This ordinance was created to help prevent dangerous ice spots that are caused by improper sump pump discharge during the winter months.

Click here for FAQs and an infographics explaining the ordinance.

Click here to view a Water Discharge Flowchart
, detailing different scenarios relating to the ordinance.


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MS4 Tips and Information


To learn how you can help the environment and for fun educational activities for the whole family, go to our MS4 Tips and Information Page.

Storm Water Infrastructure Goal

Mt. Lebanon repairs and removes debris from more than 75 miles of storm sewers and over 2,500 catch basins throughout the municipality. Responsibilities include periodic inspections of the municipal storm drain system, catch basin construction and reconstruction, and response to general storm sewer problems.




Project Status Updates



Stormwater Utility Fund - January 2019
Stormwater Utility Fund - September 2016
Stormwater Utility Fund - November 2015
Stormwater Utility Fund - September 2014
Stormwater Utility Fund - December 2013

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