Florida has a specific law about irrigation controllers, and many homeowners do not know it exists. Florida Statute 373.62 requires that any automatic irrigation system installed after May 1, 1991 must have a functioning rain sensor or soil moisture sensor. The law is enforced at the local level, and a system without a working sensor can result in fines and wasted water. Beyond the legal requirement, upgrading to a smart controller is one of the highest-return investments an Orlando homeowner can make.
What a Rain Sensor Does
A rain sensor is a small device mounted on the roof or the side of the house. It detects rainfall and interrupts the irrigation cycle when enough rain has fallen. The amount of rain required to trigger the sensor is adjustable, typically from one-eighth inch to one inch. When the sensor is wet, the controller skips the next scheduled cycle. When the sensor dries out, the system resumes normal operation. The device is simple, reliable, and inexpensive. Installation costs $50 to $150 depending on the controller and wiring.
What a Smart Controller Does
A smart controller, also called an ET controller or weather-based controller, goes several steps further. It connects to local weather data, either through Wi-Fi or a dedicated sensor, and adjusts run times based on evapotranspiration rates. ET is the combined loss of water from soil evaporation and plant transpiration. When ET is high, the controller runs longer. When ET is low, it runs less. Some smart controllers also account for soil type, plant type, slope, and sun exposure. The result is a system that applies only as much water as the landscape actually needs.
Why This Matters in Orlando
Orlando’s rainfall is highly seasonal. The wet season from June through September brings frequent afternoon thunderstorms, often delivering more water in a week than the lawn needs. The dry season from October through May can go weeks without significant rain. A standard controller on a fixed schedule waters the same amount year-round, which means it over-waters in summer and under-waters in spring. A smart controller adjusts automatically.
The savings are measurable. Studies by the University of Florida and water management districts have found that smart controllers reduce irrigation water use by twenty to fifty percent compared to fixed schedules. For an Orlando homeowner with an average-sized lawn, that can translate to hundreds of gallons per week during the wet season and a meaningful reduction in the water bill.
Compliance and the Law
Compliance with Statute 373.62 is straightforward. If your system was installed after May 1, 1991 and does not have a functioning rain sensor, you are out of compliance. The sensor must be operational, not just present. A sensor that has been disconnected or has failed does not satisfy the requirement. During a home inspection or a utility audit, a non-functioning sensor can trigger a violation notice. Our guide on Orlando watering restrictions covers the enforcement context.
How to Choose a Controller
If you are replacing an older controller, look for one that is WaterSense labeled. The EPA WaterSense program certifies controllers that meet specific performance criteria for water savings. Look for features like weather-based scheduling, zone-specific settings, and the ability to pause for rain or freeze events. A freeze sensor is a useful addition in Central Florida, where winter cold snaps can damage tropical landscaping. Our article on storm prep for Orlando sprinkler systems covers freeze and storm considerations.
Installation and Setup
Replacing a controller is a straightforward job for a licensed irrigation contractor, typically taking one to two hours. The critical part is programming. A smart controller that is not configured for your soil type, plant types, and sun exposure will not deliver the expected savings. Ask the installer to walk through the settings and explain the schedule. Our guide on sprinkler installation cost covers controller pricing. And for the underlying soil conditions that affect scheduling, see our article on Orlando’s sandy soil.
The Bottom Line
Rain sensors are required by law. Smart controllers are a proven way to save water and money. For Orlando homeowners, upgrading both is one of the simplest, most cost-effective improvements available. The payback period is often under two years, and the system does the work automatically.
Leave a Reply