Aquatic Ecosystem Assessment


A Total Maximum Daily Load (TMDL) is the end product of efforts to quantify the capacity of a waterbody to assimilate substances entering the water from natural and manmade sources.  The process of completing a TMDL includes developing an allocation for substances contributed from both point sources (e.g., treated effluent discharges) and non-point sources (e.g., agricultural and urban runoff).  The TMDL process usually involves use of water quality models and other tools that describe the impact of these contributions to the waterbody.

NCASI has both expertise and several tools that can be used by members to ensure that the science describing the contribution of their wastewater and its effect on water quality is accurate and appropriate for purposes of developing regulatory limits.