Californians will not be able to water their lawns for 48 hours after rainstorms or let their sprinklers run on to the sidewalk under new, mandatory water saving rules that could result in a fine of up to $500 a day.

The restrictions, adopted by state regulators on Tuesday, come as California continues to struggle under drought conditions, despite a recent wave of heavy rain and snow.

The rules could take effect as soon as the end of the month, though regulators stressed they want to encourage voluntary conservation and that it will be up to local authorities to decide on whether to enforce fines.

California’s governor, Gavin Newsom, had previously called for residents to voluntarily reduce water use by 15% compared with last year, but the state has continued to fall short. Between July and November, the state’s water usage went down just 6%.

Among the water uses that will not be allowed under the new rules: […]