We are building new stormwater solutions to reduce flooding, decrease water pollution, and change Pittsburgh's infrastructure for the better.
Pittsburgh’s first sewer lines were constructed in the 1840s in what is now present-day Shadyside and Oakland. These lines sent water directly to the Monongahela River. By 1908, nearly 400 miles of underground sewer lines were in place, establishing the start of our 1,200-mile combined sewer system.
Today, Pittsburgh looks a lot different.
There are more buildings, more roads, less green space, and greater demand placed on our infrastructure. While many things have changed, the way we treat wastewater and stormwater largely remains the same.
What does all this mean?
Our combined sewer system sends wastewater and stormwater through one pipe to ALCOSAN, the regional wastewater treatment plant located along the Ohio River. Once water is treated, it is released into the river for downstream communities to use as drinking water.
Our sewer system is overwhelmed by the increasing intensity and frequency of rain. And with so much pavement and hard surfaces throughout the city, all this rain has nowhere to go.
Sewage frequently overflows into rivers, floods our streets, and overflows into basements throughout Pittsburgh. This method of sending wastewater and stormwater through one pipe is no longer acceptable.
How are we addressing this problem?
We are building a new wave of stormwater infrastructure that captures the rain where it falls, soaks into the ground, and is slowly released back into the sewer system.
They use a combination of green and gray infrastructure that on the surface mimic nature using vegetation, engineered soils, and open channels that retain water. Underneath are storage systems that hold water back before slowly releasing it through our network of sewer pipes.
The new projects are cost-effective and help to reduce basement backups, sewer overflows, and improve water quality. As we build up our network of stormwater infrastructure throughout Pittsburgh, they will become more effective at addressing some of our most crucial stormwater challenges. For more information about our plans to manage stormwater, including the proposed stormwater fee, please visit www.pgh2ostormwater.com.
See green stormwater infrastructure in action.
As heavier and more intense rains overwhelm our sewer system, stormwater management is a growing concern throughout Pittsburgh. Heavy rains cause sewage to overflow into rivers and streams, flood our streets, and backup into basements. To solve the problem of too much stormwater, we are managing it more deliberately across Pittsburgh.
Read more about the stormwater program and the plans we are implementing.
Haverhill Stormwater Improvements Project
We are planning stormwater improvements to address a groundwater seep and related slope stability issues at City-owned vacant properties on Haverhill Street at the intersection of the East Hills and Homewood neighborhoods.
A new stormwater fee, recently approved by the Pennsylvania Public Utility Commission, will become effective on January 12, 2022. On or after this date, Pittsburgh Water and Sewer Authority customers who own property in Pittsburgh will begin to see the new charge on their bill.
A stormwater fee for Pittsburgh is a notable change. Historically, we have funded our stormwater services from wastewater rates based on water usage.
The new stormwater fee is based on a property's hard or impervious surfaces. All property owners in Pittsburgh will now contribute a share proportional to the amount of runoff generated by their property. Establishing a fee based on hard surfaces such as roofs, pavement, and asphalt is a more equitable way to charge for stormwater and fund the stormwater projects and initiatives needed to improve stormwater management in Pittsburgh.
As part of implementing the new stormwater fee, wastewater conveyance rates will decrease since the new stormwater fee will begin to recover the previously included stormwater costs.
Managing Separate Storm Sewers (MS4)
Managing Separate Storm Sewers (MS4)
Inlets like this one collect urban stormwater runoff (rain and snowmelt) and discharge it into rivers around the city. It is important to protect these inlets from debris and other pollution that can harm our river’s fish, recreation, and human health, as well as cause drainage backups leading to flooding.
Visit our Managing Separate Storm Sewers (MS4) webpage to learn what PWSA is doing to reduce stormwater pollution and how you can take simple actions every day to help.
Everyone in Pittsburgh needs to become part of the stormwater solution. You can make a difference by taking small actions every day to manage stormwater on your property, improve the quality of our rivers and streams, and protect those you care about during the large storms that frequently occur in Pittsburgh. Explore our stormwater pages for helpful resources and tips.
- Help Manage Stormwater: Learn how you can become part of the stormwater solutions that are needed in Pittsburgh.
- Find Your Sewershed: Use this searchable map to find which sewershed you live in and its contribution to combined sewer overflows (CSOs) to our rivers.
- Flood Preparedness: Learn how to protect your family, property, and belongings from flooding.