Water pollution makes water unfit for drinking.

Explanation

### Step-by-Step Solution:

1. **Understanding Water Pollution**: Water pollution refers to the contamination of water bodies (like rivers, lakes, and oceans) due to harmful substances. This can occur from various sources, including industrial waste, sewage, and agricultural runoff.

2. **Sources of Water Pollution**:
- **Industrial Effluents**: Factories often release chemicals and waste directly into water bodies, leading to contamination.
- **Sewage**: Wastewater from homes and industries can introduce harmful bacteria and chemicals into water sources.
- **Pesticides and Fertilizers**: These agricultural chemicals can wash into water bodies during rain, polluting the water.
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