Can I place a lock my out door Water Spigots?

[Ricardo P.]

I purchased a 5 plex unit in California. The Property is NOT under rent control. All my tenants are month to month. And I pay for the water bill. I’ve been told by a tenant that everyone uses the water hose to fill up portable pools,wash their vehicles,spray the sidewalk and driveway.When my lease clearly states NO CAR WASHING on property. I feel as if they are wasting water just because they can. While I’m trying to conserve it. Specially since California was in a Serious Drought. Can I legally place locks on the spigots? Does anyone have any information on this? IM NOT TURNING THE WATER OFF IM JUST LOCKING THE OUTDOOR SPIGOTS. Thank you 

[Ricardo P.]

Does anyone else have any sugestions on this topic?