Hilldale Water District (HWD), located in Warren County, Mississippi was incorporated as a customer owned non-profit water utility in 1965 serving 176 customers with 209 taps. In the early years, Hilldale had a single simple treatment plant sourced by three wells. After aeration
and chlorination treatment, a single 100,000 gallon elevated tank stored the District’s potable water. Another 100,000 gallon elevated tank and a second treatment plant was added in 1981, because of residential-growth. This second treatment plant included the added feature of pressure filters for iron removal. In 1992, pressure filters were also added to the original treatment plant facility.