Authority officials say the reduction can be attributed to the installation of bus wash recycling systems at two VTA maintenance yards in San Jose.
The systems help prevent hazardous wastewater from entering the city's storm drain system, and have reduced water usage by 14 million gallons since 2005, according to the VTA.
"VTA strives to enhance water conservation techniques and reduce water usage at transit facilities as part of VTA's consistent commitment to creating a greener Silicon Valley," VTA general manager Michael Burns said in a prepared statement.
VTA conducts bus and light rail operations around Santa Clara County, as well as specific highway improvement projects and countywide transportation planning.
