Which of the following is NOT a strategy for reducing potable water use for irrigation?

The correct choice highlights that installing building-level metering is not a strategy aimed directly at reducing potable water use for irrigation. Building-level metering typically focuses on monitoring and managing overall water usage within a building rather than specifically targeting irrigation practices. Effective irrigation strategies, on the other hand, prioritize the optimization of water consumption in landscapes and gardens.

Using treated wastewater stands out as a sustainable solution since it provides an alternative to potable water for irrigation, helping to conserve drinking water supplies. Employing only grass for play fields is a less efficient choice since it may limit the variety of landscapes but does directly pertain to irrigation practices. The installation of smart-sensor technology helps manage water usage more efficiently by adapting to environmental conditions and ensuring that irrigation occurs only when necessary, which directly contributes to reducing overall water use for irrigation.

In this context, while metering is essential for tracking water use, it does not inherently reduce potable water consumption for irrigation as the other strategies do.