No contamination of drinking water can occur if closed pipes are used for drainage of sewage. Is this always true? Explain.
The contamination of drinking water can occur even if closed pipes are used for the drainage of sewage. This is because in many cases, the joints between the sewage lines may be leaky and this can lead to the leakage of sewage. This sewage can mix with the drinking water if the sewage line and water pipeline are proximate to each other.
Living Science (2020, 2021)