Which procedure should follow if well water is suspected to be contaminated?

The appropriate action when well water is suspected to be contaminated is to stop using it and seek immediate testing. This response is crucial for several reasons. Firstly, contaminated water can pose serious health risks, including bacterial infections, chemical exposure, or other hazardous conditions. Continuing to use contaminated water can lead to illness or exacerbate existing health issues.

Seeking immediate testing is essential because it helps identify the specific contaminants present in the water, allowing for targeted treatment or remediation. Testing can reveal not only the presence of harmful microorganisms but also chemical pollutants that may not be immediately obvious. By stopping use and testing, you can prevent exposure while accurately assessing the water's safety.

The other options do not address the immediate health risks or the need for precise information regarding the contamination. Filtering water, for example, may only remove certain particles or substances but might not affect pathogens or chemical pollutants. Increasing pumping could potentially exacerbate contamination issues, especially if the source of contamination is not identified. Sealing the well should be considered only as a last resort when the well is determined to be permanently unsafe; instead, initial response should focus on testing and treatment.