San José–Santa Clara Regional Wastewater Facility

The San José–Santa Clara Regional Wastewater Facility is a wastewater treatment plant located in the Alviso neighborhood of San Jose, California. The facility treats 110 million U.S. gallons of wastewater per day, with a capacity of up to 167 million U.S. gal/d, making it the largest tertiary treatment plant in the western United States. It serves 1.5 million residents and over 17,000 business facilities in eight cities. The 2,600-acre site is operated by the San Jose Environmental Services Department and jointly owned by the cities of San Jose and Santa Clara. It began operations in 1956 to address severe water pollution issues and played a key role in San Jose's aggressive annexation program during the 1950s and 1960s.

Source: Wikipedia