By MyFM's Rick Michaels - The presence of contaminants in the drinking water for all customers of the Holliston Municipal Water Supply has led to additional samplings to evaluate the extent of the contamination. The water system was notified yesterday that a water sample collected on Tuesday from Well #4, tested positive for E-Coli, which is a fecal indicator. The sample did not detect any fecal contaminants nonetheless, Well # 4 was immediately shut down. It’s one of five active Wells in the Holliston Municipal Water Supply system. The water is disinfected with chlorine to kill viruses and bacteria like E-Coli further actions may be taken as necessary. The system is routinely monitored to ensure the safety of the water this is not an emergency, you do not need to boil your water or take other corrective actions at this time.