Philadelphia Water Department

June 11, 2012, 9am PDT
With cities across the country seeking to find innovative and economical solutions to problems caused by combined sewer systems, could Philly's popular Green City, Clean Waters program be a model worth copying?
National Geographic News
May 10, 2011, 9am PDT
Philadelphia's water department has opened its first street made of porous pavement, which will help city streets safer by absorbing rain water.
philly.com