Despite being the world’s wealthiest nation, the U.S. has communities that are still exposed to toxic tap water. Today, we hear how a city in New Mexico has struggled with high levels of arsenic in its water — and how its residents are fighting back. Read more:Fifty years after the passage of the Safe Drinking Water Act, which is supposed to limit toxins in Americans’ water, many people around the country cannot safely drink from the tap.Drinking water samples tested in Sunland Park, a small New Mexico city, found illegally high levels of arsenic in each of the past 16 years. In 2016, levels reached five times the legal limit.The city also reflects parts of the United States — low-income areas and Latino communities — that are particularly exposed to arsenic in their drinking water at higher rates than any other racial or ethnic group, even when controlling for socioeconomic factors. In Sunland Park, residents’ complaints have mounted in recent months, and some are taking the first steps toward filing a lawsuit. Today on “Post Reports,” we talk to investigative reporter Silvia Foster-Frau about her reporting from New Mexico and why problems with toxic water there — and elsewhere in the country — persist. Today’s show was produced by Emma Talkoff. It was edited by Maggie Penman and Monica Campbell and mixed by Sean Carter. Subscribe to The Washington Post here.