Pick up sample bottles or drop off samples for private well water testing. Testing is offered for coliform and E. coli bacteria, inorganics, iron bacteria, and sulfur bacteria. Samples are accepted from 8:30 a.m. until 5:00 p.m. Monday through Thursday, and 8:30 a.m. until 4:00 p.m. on Friday. The Lab does not accept bacteriological samples the day before a holiday. See below for exceptions.