Restrictions on watering plants are designed to facilitate efficient use of the available water. Most of the restrictions specify the amount of water to be applied, the time watering can be done, and the days for residential and non-residential watering.
One common watering plant restriction requires that no watering should be done between 10 a.m. and 4 p.m. The restriction aims to ensure that almost all the water applied benefits the plants. Watering can also be limited to only twice per week. A typical rule can allow residential watering to be done on Wednesdays and Saturdays, while non-residential watering can be done on Mondays and Thursdays of every week. Some local governments also restrict watering of plants to using water from private wells and pumps.
States can restrict watering of plants and lawns to an amount that is suitable for a given landscape. The restrictions of watering on flat and sloppy lands can differ, because one can retain water better than the other. During rainy seasons, watering of plants can be prohibited completely because the rain can meet all the water needs of the plants. Individuals watering their plants using irrigation systems that were installed before 2000, may be required to install rain sensor devices that override the system during rainy days.