Answer. Waterborne diseases can be prevented by taking the following measures:
(i) Provision of safe water: Drinking water must be properly treated and purified.
(ii) Disposal of sewage: There must be adequate sanitary disposal of sewage. Any type of waste must not be thrown or discharged directly in water supplies or
reservoirs.
(iii) Control of toxic chemicals: Chemical contamination can cause acute illness, but often toxic contaminants are slow poisons and carcinogens. There must be a strict- control over the use of pesticides and other chemicals.