Welkin Mechanical, LLC is a mechanical construction firm specializing in process piping, pumping, filtration, and in-faciliti ... es water and waste water projects. Welkin’s principals have served clients ranging from government agencies to utilities, contractors and private firms. Welkin’s projects include the North River Wastewater Treatment Plant; reconstruction of piping systems at various WPCPs; and shaft maintenance and tunnel dewatering projects for the New York City Department of Environmental Protection. read more