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Global Change Impacts & Adaptation

A Screening Assessment of the Potential Impacts of Climate Change on Combined Sewer Overflow (CSO) Mitigation in the Great Lakes and New England Regions (Final Report)

Notice

EPA is announcing the release of a final report titled, A Screening Assessment of the Potential Impacts of Climate Change on Combined Sewer Overflow (CSO) Mitigation in the Great Lakes and New England Regions. The document was prepared by the National Center for Environmental Assessment's Global Climate Research Staff.

Report Information

This report is a screening-level assessment of the potential implications climate change has had on combined sewer overflow (CSO) mitigation in the Great Lakes and New England Regions.

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Thomas Johnson
  • by phone at:   703-347-8618
  • by fax at:   703-347-8694
  • by email at:  johnson.thomas@epa.gov

Background

Cover of the Climate Change on Combined Sewer Overflow Document Combined sewer systems (CSSs) collect and co-treat storm water and municipal wastewater. During high intensity rainfall events, the capacity of CSSs can be exceeded resulting in the discharge of untreated storm water and wastewater directly into receiving streams. These combined sewer overflow events (CSOs) can result in high concentrations of microbial pathogens, biochemical oxygen demand, suspended solids, and other pollutants in receiving waters. Climate change in many parts of the country is expected to increase the proportion of rainfall occurring in high intensity events, resulting in increased stormwater runoff.

These changes present a risk of increased CSO frequency and water quality impairment. This report is a screening-level assessment of the potential implications climate change on combined sewer overflow (CSO) mitigation in the Great Lakes and New England Regions.

History/Chronology

Sep 2006EPA released the external review draft report.
Mar 2007Federal Register Notice.
Feb 2008EPA released the final report.

Next Steps

This is the final report.

Citation

U.S. EPA. A Screening Assessment of the Potential Impacts of Climate Change on Combined Sewer Overflow (CSO) Mitigation in the Great Lakes and New England Regions (Final Report). U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-07/033F, 2008.

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