A city's raw sewage into the sea?

The disposal of sewage is one of the most difficult problems facing human societies. The need to remove unpleasant and health-threatening effluent from areas where large numbers of people live, and to put it somewhere else where other forms of life, aesthetic considerations and so on, are not harmed or offended, is always with us. We in New Zealand have not been notably successful at cleaning up our wastes. In many parts of the country, raw sewage is still discharged into rivers or into the sea. The results are foul smells, poisoned sea foods, ruined coastlines and evil coloured water