Winterization is the process in which a trained professional drains the water in a sprinkler system at the end of the summer season. When a "winterization" is performed, the technician attaches a compressor to the sprinkler system's vacuum breaker, backflow, or pump at the point air travels through the sprinkler lines and releases water through each individual sprinkler head until it is completely drained.

It is essential to have this done after every summer season to prevent your system from freeze damage. Always have this service performed by a licensed professional to ensure that the work performed is under warranty.

Once the system has been winterized it is important not to turn the water on until the following Spring. If a warm spell should occur during the Winter, water by hose, do not attempt to turn on your own sprinkler system.