These are some of the stories we’ve been following this week.

• A new study found that nearly a quarter of Americans have tap water that has not been monitored or is not safe to drink.

• New coal ash regulations in Kentucky are the center of a lawsuit filed by a resident opposed to a proposed coal ash landfill that would be built near his home.

• The EB-5 Immigrant Investor Program received another extension from Congress this week as part of the most recent spending bill. The program will once again be up for debate as lawmakers decide if the program will be changed.

• Landowners near a proposed construction site for the Keystone XL Pipeline were expected in court this week to voice their opposition. The route for Nebraska is one of the last obstacles standing in the way of the completion of the pipeline.

• Turkey’s sovereign wealth fund will continue to diversify by signing a deal to develop an interest-free mortgage company, also known as “Islamic Mortgage.”

• Real estate continues to be a popular investment for sovereign wealth funds. This year 64 percent of the funds have real estate investments, up from 59 percent in 2015.

• Congress is running out of time to reverse regulations that limit methane emissions. If lawmakers do rollback the regulation, they could do it in a way that would prevent future administrations from putting the regulations back in place.

• Two trains carrying crude collided last weekend in Mississippi. More than 20,000 gallons of oil leaked as a result of the crash.

• Homes located near stores like Starbucks and Trader Joe’s typically see a jump in their property values.

• Property values in New Zealand were stagnant February through April. Economists pointed to limits on higher risk mortgage loans as one of the factors that lowered home sales and kept down property values.