What is a Combined Sewer Overflow (CSO)?

Combined Sewer Systems: Down, Dirty, and Out of Date

“When combined sewer systems were introduced in 1855, they were hailed as a vast improvement over urban cesspool ditches that ran along city streets and spilled over when it rained”, writes John Tibbets in the Environmental Health Perspectives.

Although some major cities like New York City and Philadelphia have combined sewer systems, most communities with CSO problems have fewer than 10,000 people, according to a 2004 EPA report: Impacts and Control of CSOs and SSOs

Watch Video

City of Toronto has provided this excellent short video that depicts exactly what the problem is and why our waterways stink!

Next Level Stormwater Management supplies vegetated and blue roof solutions that help reduce the rate of stormwater runoff . Therefore, help mitigate CSOs.  Contact us for the right solution for your roof.