(Harrisburg) -- Construction of structures like sheds, porches or additions may require some extra work to account for storm water runoff.
It's part of new regulations in Lancaster County that will be implemented by November.
They require the rain be channeled or trapped before it can carry any potential pollution into waterways.
Harry Campbell is the Pennsylvania Executive Director for the Chesapeake Bay Foundation.
Speaking on witf's Radio Smart Talk, he says many communities are adopting storm water measures to improve the health of the bay.
"State requirements and others are already moving in that direction. We've been instituting these kinds of things as a state since 2006," Campbell says. "The perception is that it's new to folks, but this is sort of standard operating procedure elsewhere."
Despite concerns construction costs could rise with the new regulations, some Lancaster City buildings have been using so-called "green roofs" to decrease runoff.
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