When you want water testing Durham CT, call Eastern Drill Co. Call Eastern Drill is a full-service water quality company serving Middlesex County CT. Learn more about your local water quality with Eastern Drill Co.  Does your Durham CT home have a private well? The Connecticut Department of Public Health recently estimated that just under a quarter of households in CT obtain their water from private wells. When you have a young family, it is important to have pure water coming into your home