Californians, your yard sprinklers are about to get a little bit more expensive. The good news is, your water bill is about to get cheaper. California on Wednesday officially adopted new regulations which are estimated to save more than 400 million gallons of water per day within 10 years, enough to supply San Diego, the second largest city in the state, according to the Natural Resources Defense Council. Beginning in 2020, spray sprinklers will be required to be sold with a component that restricts the water flow to as close as possible to 30 pounds per square inch (PSI), the manufacturer-recommended level.