NEHA Water Supply Practice Test 2025 – Comprehensive Exam Prep

Question: 1 / 400

What is one of the most common reasons for the contamination of wells drilled through rock?

Use of contaminated equipment

Failure to seal well casing properly

One of the most common reasons for the contamination of wells drilled through rock is the failure to seal the well casing properly. Proper sealing of the well casing is crucial because it prevents surface contaminants from entering the well. If the casing is not sealed effectively, water and other pollutants from the surface can infiltrate the well, especially in rocky soil where fractures may provide easy pathways for these contaminants.

Additionally, unsealed casings can allow groundwater, which may be polluted, to flow into the well, compromising water quality. This situation is particularly concerning since wells are often intended to provide safe drinking water, and any contamination can pose serious health risks. Therefore, ensuring the integrity of the well casing and proper sealing techniques is vital in preventing contamination issues in wells drilled through rock.

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Natural leaks in rock

Excessive rainfall

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