As drought conditions worsen across Northern California, the Marin Municipal Water District is about to become the Bay Area’s first major water agency to make the leap to mandatory water restrictions.

The utility is expected to adopt a plan Tuesday that would require nearly 200,000 residents of southern and central Marin County to limit outdoor watering to one day a week as well as to stop washing their cars, refilling their swimming pools and power-washing their homes, among other things. Offenders could face fines of up to $250.