Decades after the nation’s capital began its historic cleanup, sanitary sewage still occasionally swamps the Potomac River. Are sewage systems also dumping human waste and other pollutants into waterways near you? This week’s TipSheet has the background on the problem of combined sewage overflow, as well as resources for finding out what’s happening near you.

While environmental themes were less prominent at the Sundance Film Festival this year, our correspondent JoAnn Valenti unearthed ecological messages from documentaries that explore the emergence of climate change refugees in the face of sea level rise, the escape from modernity into wilderness and the confrontation of environmental threats by young innovators.

A new book on the Gulf of Mexico earns kudos for the balance and passion of its tone, as well as for its historical storytelling about this important ecosystem and the overfishing, oil spills, hurricanes, explosive growth and poor land-use decisions it faces. BookShelf reviews Jack Davis’ “The Gulf.”

Infrastructure is much in the news these days, with battles over politics and funding yielding stories for environment reporters. In play are a Trump plan, who gets to pick projects, who pays and much more. But in an election year, how likely are infrastructure plans to move forward? The backstory, with angles for environment and energy, plus what to watch for in 2018, in our Backgrounder on infrastructure.

Covering local infrastructure projects often means covering energy and the environment. This week’s TipSheet offers a companion to our special backgrounder on the national infrastructure story emerging out of Washington. We’ve got dozens of resources and links for finding infrastructure news and information from Congress, executive agencies, infrastructure organizations and environmental groups.

For decades, federal law has required environmental impact statements for big federal actions, like the building of dams, highways and more. Those impact statements, a valued reporting tool, may now be under threat. This week’s TipSheet explains how journalists can find them and use them, and why they could be at risk.