Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

Groundwater is generally free of which of the following?

1. Turbidity

2. Color

3. Organic matter

4. All of the above

The correct answer is: All of the above

Groundwater is typically characterized by being free of several contaminants that are more common in surface water sources. One significant aspect is that groundwater is generally not associated with turbidity, color, or organic matter. Turbidity, which refers to the cloudiness or haziness in water caused by large numbers of individual particles, is usually low in groundwater due to the natural filtration processes it undergoes as it passes through soil and rock layers. These layers effectively remove particulate matter, contributing to the clarity of groundwater. Color in water is often indicative of dissolved substances, such as organic compounds or minerals. In groundwater, the lack of surface exposure typically results in minimal color alteration, making it generally clear and color-free compared to surface waters that can obtain colors from organic debris or sediment. Organic matter, which can introduce bacteria, viruses, and nutrients into water, is usually absent in substantial amounts in groundwater. As groundwater is often isolated from surface interactions, the potential for high levels of organic material is significantly reduced. Given these characteristics, it is accurate to state that groundwater is generally free of turbidity, color, and organic matter, supporting the conclusion that it is devoid of these elements.