Houston lifts boil-water order affecting more than 2 millionHOUSTON (AP) — Houston officials lifted an order Tuesday that had called for more than 2 million people in the nation’s fourth-largest city to boil their tap water before drinking or using it.Because the issue was within the plant’s system, backup power generators would not have made a difference, Turner said.EPA leader listens to water concerns in Mississippi capitalMississippi capital to hire emergency water plant workersEPA: Water in Mississippi's capital city is safe to drinkTanzania's commercial capital imposes water restrictionsThe power system at the water plant undergoes regular maintenance, Turner said, but he did not give a timeline for how often.The mayor said he has ordered a diagnostic review of the system to understand how the problem was possible and how it can be prevented.Sixteen sensors marked dips under the minimum pressure levels required by the Texas Commission on Environmental Quality, 14 of them for only 2 minutes and two of them for nearly 30 minutes, Turner said."