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

Which of these contaminants may groundwater be high in?

1. Pesticides

2. Minerals, gases, or corrosives

3. Heavy metals

4. Polycyclic aromatic hydrocarbons

The correct answer is: Minerals, gases, or corrosives

The selection of minerals, gases, or corrosives as contaminants that groundwater may be high in is correct due to the nature of groundwater sources and their interactions with surrounding geological formations. Groundwater often travels through various rock and soil layers, which can dissolve and carry natural minerals such as calcium, magnesium, and iron, leading to elevated concentrations. Additionally, groundwater can sometimes be influenced by geological conditions that contribute harmful gases, such as hydrogen sulfide from anaerobic decomposition, or corrosive substances that can lead to issues in water quality and piping systems. For instance, certain minerals can cause corrosion in plumbing, impacting both human health and infrastructure. While pesticides, heavy metals, and polycyclic aromatic hydrocarbons can also contaminate groundwater, they are often associated with specific land use activities or industrial discharges. Their presence tends to be more localized compared to the more ubiquitous nature of minerals, gases, or corrosives that are naturally occurring and can be prevalent in various aquifers.