This information from Illinois American Water Company:
Alton, Ill. (May 31, 2014) – Illinois American Water has lifted the boil water order issued on Friday, May 30, 2014, for affected customers in Alton, Godfrey, Grafton and Elsah (Principia College and Joywood included). The boil order is also lifted for Illinois American Water’s wholesale customers in this area that were affected.
Water quality tests have confirmed the water continues to meet all U.S. Environmental Protection Agency Safe Drinking Water Act standards and regulations. It is no longer necessary for customers to boil their water before drinking or cooking. During this boil water order, Illinois American Water performed a series of tests to determine if the water met regulatory drinking water standards. Samples were taken from sites in the affected area and tests confirmed that the water meets all federal requirements.