What the Metropolitan Water District says about leak monitors
The Metropolitan Water District's SoCal WaterSmart program runs a pilot rebate for flow monitor devices, which track a home's water use and can help detect leaks. Funding is limited. When its page was checked in October 2026, MWD also said not every device qualifies in every area, and it sent applicants to its online rebate estimator, and those who are not eligible to their local water agency.
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Installation varies by device. Some can be put in by the homeowner; MWD's product notes say others must be installed by a plumber. Either way, the device has to be installed and activated before the rebate application goes in, and MWD may inspect it. If a contractor buys the device for the customer, the contractor's paid receipt or invoice is what the customer submits. Contractors and other third parties cannot claim the rebate themselves.
Homes with automatic residential fire sprinklers need care here. MWD warns that installing a leak detector the wrong way could hinder the sprinklers: a plumbed leak detection device belongs only on the domestic water line after it splits from the fire sprinkler system, never on the home's incoming water line upstream of the sprinklers. Its advice is to consult a licensed plumber.
Toilets fall under the same program. SoCal WaterSmart accepts only one toilet rebate application per customer, so anyone replacing several toilets has to list them all on a single application.

