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Our Mission

The mission of Triunfo Water & Sanitation District is to meet current and future needs of our customers by providing potable water, recycled water, and wastewater services. We are committed to providing services that are reliable, high quality, cost efficient, and delivered in a customer-friendly manner. The District will judiciously manage its assets and finances, effectively plan for future needs, protect the environment, and work to maintain public trust and confidence.

Our History

The Beginning

Triunfo Sanitation District was organized in 1963, pursuant to California Health and Safety Code Division 5, Part 3, Chapter 3, Section 4700, as a special district to provide sewer services for the eastern portion of Ventura County. At that time, the Board of Directors consisted of two elected and three appointed members.

In 1964, Triunfo and Las Virgenes Municipal Water District established a Joint Powers Authority (JPA) to construct, operate, and maintain a regional sewage collection and treatment system to serve customers in their respective service areas. The JPA built and started operating the Tapia Water Reclamation Facility in 1965 to treat wastewater within the Malibu Creek watershed. [more]

In 1977, Triunfo contracted with Ventura Regional Sanitation District for operation, management, and maintenance services.

Service Expansion

In 1993, Triunfo expanded its operations to include potable water service with the purchase of Metropolitan Development’s Metropolitan Water Company, located within the District’s service area in Oak Park. The new entity became known as Oak Park Water Service. In 2019, Triunfo added “Water” to its name and integrated the operations of Oak Park Water Service into the single entity of Triunfo Water & Sanitation District.

In addition to potable water and wastewater services, Triunfo Water & Sanitation District provides recycled water for the irrigation of various public spaces such as parks and schoolyards, homeowner association landscapes, golf courses, and roadway greenbelts. In 2017, to improve operating efficiency and expand district service, the district purchased the recycled water system from Calleguas Metropolitan Water District.

Current Operations

Until 2010, Triunfo’s Board consisted of two elected and three appointed Directors. Triunfo is now governed by a five-member all-elected Board with a dedicated management, customer, and operations staff. Covering a service area of approximately 50 square miles, the District provides wastewater collection and treatment services to more than 30,000 people in Oak Park, Lake Sherwood, Bell Canyon, and the Westlake Village and North Ranch portions of Thousand Oaks. Triunfo supplies potable water to more than 14,000 people in Oak Park and provides recycled water to various portions of its service area.

In addition to field services staff, Triunfo Water & Sanitation District moved its administrative and customer service offices to Westlake Village in 2022, to better serve its valued customers.

TWSD celebrated its 60th year in 2023!

Board of Directors

Triunfo Water & Sanitation District is governed by a five-member Board of Directors, each elected at large to a four-year term. District elections are held every two years in November on even-numbered years. Terms are staggered, with two terms expiring in one even-numbered year, and three terms expiring the following even-numbered year.

The Board of Directors meets on the fourth Monday of each month at 5:15 p.m. at the Triunfo Water & Sanitation District offices at 370 N. Westlake Blvd., Ste. 100, Westlake Village, CA 91362. Meeting agenda packets are available via the link below.

Clerk of the Board, Fidela Garcia  Email or  805-658-4642


Mark Norris
Mark Norris

General Manager

Rates For Services

Rates for Service

Triunfo’s rates for potable water, recycled water, and sewer service are available at the links below, along with information about the corresponding ordinances.

Las Virgenes-Triunfo Joint Powers Authority

In 1964, a Joint Powers Authority partnership was established between Triunfo Water & Sanitation District and Las Virgenes Municipal Water District to cooperatively treat wastewater in the Malibu Creek watershed. The Tapia Water Reclamation Facility began operating in 1965 and had an initial capacity of 0.5 million gallons per day. In 1972, the plant began to produce recycled water for landscape irrigation. As a result of population growth in the 1980s and 1990s, the JPA expanded Tapia’s treatment capacity to its current level of 16 million gallons per day.

The JPA’s latest major initiative is the innovative Pure Water Project. Using “potable reuse,” a water supply strategy used by many cities and water agencies in California and across the United States, the project will enhance local water supply reliability and drought resilience, while eliminating discharges of treated water from the Tapia plant into Malibu Creek.

The Joint Powers Authority Board, made up of the combined boards of both districts, meets on the first Monday of each month and alternates the meeting locations between the Triunfo District Office and the Las Virgenes Municipal Water District office.