During the 1995-97 drought, serious difficulties were experienced by Essex
and Suffolk Water in obtaining sufficient water to meet demand. As an emerg
ency measure, a consent to discharge up to 30 Ml/d of ultraviolet disinfect
ed treated wastewater into a raw-water reservoir was obtained from the Envi
ronment Agency. Performance of the ultraviolet plant and results of monitor
ing are reported, reporting procedures are outlined, and the reaction of me
dia and water consumers are described.