Connecticut Water Service Inc. (CTWS) 3.7% [Connecticut] This is another Connecticut water supplier company that was founded in 1956.

Middlesex Water Company (MSEX) 3.7% [New Jersey & Delaware] This New Jersey based company is one of the oldies on the list, founded in 1897. It also provides wastewater services.

Artesian Resources Corporation (ARTNA) 3.4% [Delaware] Artesian provides water and fire protection services in Delaware. Founded in 1905.

Pennichuck Corp (PNNW) 3.2% [New Hampshire] This is the second oldest company on the list, which was started in 1852. It provides water to the southern half of New Hampshire.

California Water Service Group (CWT) 2.9% [California] The San Jose based company serves over 2 million customers in California.

York Water Company (YORW) 2.6% [Pennsylvania] Founded in 1816, this is the oldest company on the list and one of the oldest publicly traded companies.

American States Water Company (AWR) 2.4% [Calif and Arizona] This company just received a rate increase from the California Public Utilities Commission. In addition to distributing water, they also provide electricity to some of their customers.

Aqua America, Inc. (WTR) 2.0% [PA, OH, NC et al.] This company water in numerous states including Pennsylvania, Ohio, North Carolina, Illinois, Texas, New Jersey, Florida, Indiana, Virginia, Maine, Missouri, New York, and South Carolina.