Dilution Method of Disposing Off Sewage

The dilution method of disposing off sewage is not preferred when the diluting water is used for water supply near the point of sewage disposal. This is because the sewage can contaminate the water supply, making it unsafe to drink.

• When is the dilution method of disposing off sewage not preferred?
• What is the reason why the dilution method is not preferred when the diluting water is used for water supply near the point of sewage disposal?