<div class="teaser-content grid-center"> <div class="article-body"> <p class="wpds-c-cYdRxM wpds-c-cYdRxM-iPJLV-css font-copy">The country’s fourth-largest city ordered millions of residents Sunday night to boil their tap water, citing a morning power outage at a city water purification plant.</p> </div> <div class="article-body"> <p class="wpds-c-cYdRxM wpds-c-cYdRxM-iPJLV-css font-copy">The city’s school system also announced late Sunday that it would be closed Monday, at a minimum, as officials “closely monitor the situation.” The district’s 276 schools serve nearly 200,000 students. Other smaller school districts in the area also announced closures.</p> </div> </div> <div class="article-body"> <p class="wpds-c-cYdRxM wpds-c-cYdRxM-iPJLV-css font-copy">The 10:30 a.m. outage caused water pressure at the plant to drop below required levels. That caused water pressure problems for some residents that were resolved later in the day, public works officials said in a statement.</p> </div> <div class="article-body"> <p class="wpds-c-cYdRxM wpds-c-cYdRxM-iPJLV-css font-copy">More broadly, however, the outage called into question the safety of water for 2.2 million customers. Houston’s order Sunday night directed residents to boil all water used for food, drinking, bathing or tooth brushing and to avoid using water from refrigerators or ice makers.</p> </div> <div class="article-body"> <p class="wpds-c-cYdRxM wpds-c-cYdRxM-iPJLV-css font-copy">It wasn’t clear what caused the water plant’s power outage, why it took the city 10 hours to issue a boil-water order or how soon the order could be lifted.</p> </div>