A properly designed, installed, maintained, and operated automatic irrigation system can provide appropriate application of water across a landscape, as well as convenience to the user. The controller is fundamental to the operation of the irrigation system, the amount of time each zone operates, and, consequently, the amount of water applied to the landscape. Installing a WaterSense labeled controller:
• Provides a healthy, beautiful landscape: WaterSense labeled controllers help landscapes flourish and remain healthy by providing the right amount of water for each plant zone. Many times, overwatered landscapes are unhealthy and unattractive.
• Saves money: WaterSense labeled controllers help end users eliminate overwatering and may lower water-use expenses. However, controllers must be programmed carefully to achieve their expected savings.
• Reduces water waste: By properly scheduling irrigation events to meet plants’ needs, WaterSense labeled controllers help consumers to efficiently use limited water resources. These irrigation controllers also reduce water runoff from the landscape, helping to keep local water bodies clean and healthy.
• Provides convenience: Properly programmed WaterSense labeled controllers save end users the time and effort required to continuously monitor and integrate current weather data into irrigation schedule adjustments.
Measuring Water Savings
One way to calculate the water savings provided by a weather-based irrigation controller is to compare water bills before and after the installation. Comparing water bills will provide you with an estimate of how much the controller has saved. Changes in other water using habits or appliances will also affect water use and should be taken into consideration, as should changes in rainfall amounts. Weather in the years prior to installation will significantly impact how much water was applied to the landscape and should be considered when calculating water savings.
Source: Weather-Based Irrigation Controller Mini Report (https://www.epa.gov/sites/production/files/2017-01/documents/ws-products-minireport-irrigation-controllers.pdf)