Which requirement is key for TCEQ regarding water use in landscaping?

Compliance with drought contingency plans is a fundamental requirement for TCEQ regarding water use in landscaping because these plans are designed to manage and conserve water resources, particularly during periods of drought. Drought contingency plans outline strategies and actions that must be taken to reduce water consumption and protect water supplies during significant shortages. This is crucial in areas where water availability is inconsistent, ensuring that landscaping practices do not exacerbate water scarcity.

The proper use of water in landscaping is directly linked to the principles set forth in these contingency plans. By adhering to these guidelines, landscape professionals and property owners can implement practices that mitigate waste, promote efficient water usage, and maintain plant health while being responsive to environmental conditions.

Focusing on the other options, while compliance with environmental impact assessments is important, it does not directly address specific water use practices in landscaping. The exclusive use of recycled water is beneficial but not a requirement for all landscaping activities, as there may be other acceptable water sources. Lastly, the installation of expensive equipment may not be necessary or relevant across all landscaping scenarios, as many effective water conservation practices can be implemented with simpler, more cost-effective solutions.