New York City - New York City says a $68 million effort to modernize its water meters will help save money and water by flagging leaks fast.

The Department of Environmental Protection announced plans Wednesday to install a wireless, automatic meter-reading system citywide.

The network will measure customers’ water use four times a day. Readings are now taken four times a year, meaning leaks sometimes linger undetected.

DEP says a leaking toilet can waste 250 gallons a day _ about $640 a year.

The agency says the new system will spot spikes in water use and alert customers to check for leaks. It’s expected to take three years to install.

DEP says staff meter-readers will shift to other tasks. The agency also pays Consolidated Edison to read meters but expects to stop.