At one time, hand pump water was considered to be pure and used freely for drinking villages but not now . Why ?

Explanation

### Step-by-Step Solution:

1. **Understanding Hand Pump Water**:
- Hand pump water is essentially groundwater, which is water that is found beneath the earth's surface. It is collected from aquifers through hand pumps.

2. **Historical Perspective**:
- In the past, hand pump water was considered pure because it was naturally filtered as it passed through layers of soil and rock. This filtration process removed many impurities, making it safe for drinking.

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