narrator: brian dudley is an environmental engineer. his fieldwork contributes to the understanding of water quality degradation across the cape. dudley: as the population on the cape has increased, we have seen, obviously, a proliferation of development. there has been an increase in the amount of wastewater that is being generated and, as a result, an increase in the amount of nitrogen. and that has had a detrimental impact on a lot of resources not the least of which are the embayments and estuaries on the cape, and part of the impact has been loss of eelgrass beds, which in turn means that we have loss of shellfish habitat, finfish habitat. narrator: inadequate treatment of human waste contributes to the increase in nitrogen levels. eichner: what we're running into right now is that we are seeing the impact of the population increase and the limits of the available wastewater treatment technology that we've got. we get rid of our wastewater in the same system that we take our drinking water from. we're seeing water quality impacts i