Special to the Bulletin The most recent testing for E. coli contamination in the Medina and Sabinal rivers and Medina Lake detected no areas where the bacterial concentration exceeded hazardous levels, according to a report from the Bandera County River Authority and Groundwater District. The river authority’s staff tested 12 locations on Aug. 25, and all were under the 399 MPN – or most probable number – per 100 milliliters of water that has been set by the Texas Commission on Environment Quality as the maximum reading allowable before primary contact recreation should be prohibited. Primary contact recreation is defined as an activity ...