Simply put, backflow means an undesirable reversal of flow in the water distribution system. Common causes for backflow are main pipeline breaks and high rates of water withdrawal, however these incidents can be avoided with the use of backflow prevention devices. The City of Lubbock works hard to prevent backflow through ordinances requiring backflow prevention devices on home irrigation systems and at commercial businesses. Irrigation systems are required to have some sort of backflow prevention installed at the system’s source (where it connects to a drinking water supply). The backflow prevention assembly ensures that any substance on your lawn does not end up in your cup of coffee or glass of tea. Some substances that can enter the drinking water supply include pesticides, herbicides and fertilizers.

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Source: City of Lubbock