Before adopting water from any source for domestic supply, what examination is necessary?

When considering adopting water from any source for domestic supply, it is crucial to conduct a chemical and bacteriological examination. This is essential because both the chemical composition and microbiological safety of the water directly impact human health.

A bacteriological examination assesses the presence of harmful microorganisms, such as bacteria, viruses, and protozoa, which can cause waterborne diseases. Ensuring that the water source is free from pathogens is vital for the safety of individuals consuming the water.

In addition to the bacteriological aspect, the chemical examination evaluates the presence of potentially harmful substances, such as heavy metals, nitrates, pesticides, and other pollutants. Understanding the chemical characteristics of the water ensures that it meets safety standards and regulations, safeguarding public health and ensuring that the water is suitable for domestic use.

The other options do not encompass the comprehensive safety assessments provided by both chemical and bacteriological examinations. They may focus on specific aspects but fail to offer a complete evaluation necessary for confirming the water's safety and quality for domestic consumption.