JACKSON, Miss. (AP) — People are waiting in lines for water in Jackson, Mississippi, after the partial failure of the the city water system. Some homes and businesses have running water, but many do not. Flooding of the Pearl River worsened longstanding problems in one of two water-treatment plants. President Joe Biden has declared an emergency over the water problems in Mississippi’s capital city. Biden called the city’s mayor Wednesday to discuss response efforts. A city news release said the main water-treatment plant had “challenges with water chemistry” Wednesday, which led to a drop in output of water. That caused depletion of water tanks and a sharp decrease in water pressure.