What type of water is typically used in landscape irrigation?

• A. Surface water
• B. Desalinated water
• C. Compost leachate
• D. Non-potable water

Answer: (D)

Non-potable water is commonly used in landscape irrigation due to its availability and the fact that it is suitable for watering plants without needing the same level of treatment that drinking water requires. Non-potable water includes sources like graywater, treated wastewater, and stormwater runoff, which can be redirected for landscape irrigation purposes. This practice helps conserve precious potable water resources, which are generally reserved for drinking and cooking.

Surface water, while an important water source, is often subject to environmental regulations and can fluctuate in availability, making it less reliable as a sole source for irrigation. Desalinated water, although treated for consumption, is typically more expensive and energy-intensive to produce, making it less practical for irrigation purposes. Compost leachate, while beneficial in soils for adding nutrients, is not a primary irrigation water source, as its application is generally limited to improving soil health rather than serving as a direct irrigation strategy.