Friday, October 28, 2011
EPA's New Approach to Improving Water Quality in U.S. Cities
Aging sewer systems, not designed to handle heavy rain and snowfall in addition to handling the wastewater from growing populations and local industries, can overflow, releasing untreated sewage into waterways, onto city streets or into the basements of homes. As the runoff flows over the land or impervious surfaces, including paved streets, parking lots, and building rooftops, it accumulates debris, chemicals, sediment and other pollutants. Overflows and stormwater can carry a variety of harmful pollutants, including bacteria, metals and nutrients that threaten communities' water quality and can contribute to disease outbreaks, beach and shellfish bed closings, flooding, and fishing or swimming advisories.
To better protect water quality, EPA will work with local governments to review the Clean Water Act requirements that each municipality must comply with and look for opportunities to improve the efficiency and effectiveness of solutions developed to meet those obligations. This integrated approach will identify efficiencies where more than one water quality issue can be addressed by the same solution and where competing requirements may exist, including how to best make capital investments and meet operation and maintenance requirements.
Integrated planning approaches can also have other benefits, like leading to the identification of innovative, sustainable solutions that improve water quality and enhance community vitality. Green infrastructure, such as green roofs, rain gardens, planter boxes, and permeable pavement, is an example of an integrated solution that can reduce, capture, and treat stormwater runoff at its source before it can reach the sewer system. Green infrastructure provides a cost effective way to reduce overflows and add green space in communities.(EPA)
Read the EPA memorandum
More information on green infrastructure