Mention any three ways by which potable water can be contaminated.

Contamination of potable (drinking) water can occur in several ways such as:

1. Sewage, if improperly disposed, leaks into sub soil and may contaminate underground water supplies.
2. Urination and defecation near water bodies such as ponds, lakes and rivers
3. Contamination of water bodies by the drainage of animal washings and wastes from poultries and dairies.