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Triunfo Water & Sanitation District provides sewage collection services and wastewater treatment, supplies potable water, and treats and sells recycled water. We serve approximately 303,000 people in east Ventura County, including Oak Park, Lake Sherwood, Bell Canyon, and the Westlake Village and North Ranch portions of Thousand Oaks.

TWSD 2019

Board Meeting Agendas


We provide collection and treatment of wastewater for 12,300 residential and commercial sewer connections. Call (805) 658-4690 for sewer service inquiries.


We provide quality drinking water to 14,000 people in Oak Park and recycled water throughout our service area. Call (800) 613-0901 for water service inquiries.