CWEA Environmental Compliance Inspector Grade 1 Practice Test

The mesophilic temperature range is typically defined as the range in which mesophilic organisms, such as certain bacteria, thrive most effectively. This range is usually around 70 to 100°F (21 to 38°C). Therefore, the appropriate range includes temperatures that are conducive to the growth and metabolism of these microorganisms, which are commonly active in both environmental and biological treatment systems, particularly in wastewater treatment processes.

While the chosen answer states 80 to 100°F, the common understanding in microbiology may vary slightly. Generally, the critical point is recognizing that mesophilic temperatures support microbial activity essential for processes such as anaerobic digestion and other biological treatments.

The other options do not accurately reflect the mesophilic range. The range specified in option B exceeds the typical maximum for mesophiles, and option C represents a cold range that does not apply to mesophilic organisms, while option D represents a slightly lower range, which does not accurately capture the optimal conditions for mesophilic activity. Understanding these temperature ranges is vital for effective monitoring and control in environmental compliance and wastewater treatment operations.