Cayuga Lake is the source of drinking water for several communities, including Lansing near the southern end of the lake along the east side, which draws water through the Bolton Point Municipal Water system. There are also several lake source cooling systems that are in operation on the lake, whereby cooler water is pumped from the depths of the lake, warmed, and circulated in a closed system back to the surface. One of these systems, which is operated by Cornell University and began operation in 2000, was controversial during the planning and building states for potential negative environmental impact. All the environmental impact reports and scientific studies have shown that the Cornell lake source cooling system has not yet had and will not likely have any measurably significant environmental impact. Furthermore, Cornell's system pumps significantly less warm water back into the lake than others further north which have been operating for decades, including the coal-fired power plant on the eastern shore.