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Welcome to the Town of Mashpee’s Watershed Nitrogen Management Plan (WNMP) website. As a community, we treasure Mashpee’s beautiful coastal ponds and estuaries, yet we are responsible for their poor water quality. Excess nutrients – nitrogen , in particular – come from septic systems and wastewater treatment plants, surface runoff after rain storms or snow melt, lawn fertilizer, stormwater drainage system discharges, and other sources. Nitrogen is present in the environment naturally; however, in excess, it is considered a pollutant. More...