Skip to Content

Triunfo Water & Sanitation District

We provide sewage collection and treatment services, supply potable water, and treat and sell recycled water. We serve more than 30,000 people in east Ventura County, including Oak Park, Lake Sherwood, Bell Canyon, and the Westlake Village and North Ranch portions of Thousand Oaks.

What's the Latest

JOIN THE TWSD E-LIST

Monthly community newsletter, as well as alerts and special news.

Also join @triunfowsd on Facebook, X, LinkedIn and NextDoor!

BOARD MEETING SCHEDULE

See when TWSD and JPA are holding meetings, including special meetings.

Note: JPA meetings alternate between TWSD and Las Virgenes board rooms.

TWSD BOARD MEMBER RAY TJULANDER STEPS DOWN

Ray Tjulander stepped down from his TWSD board position after 9 years.

On July 15, the TWSD board will convene to interview, select and appoint a community member to fill the board vacancy.

Video Transcript

Urban Water Management Plan

Triunfo's Urban Water Management Plan provides details on the District's sources of supply, water use history and targets, and drought response measures.

An innovative solution to regulatory challenges that will help ensure a reliable long-term local water supply.

Customer Assistance

Eligible water customers can receive a $15 discount on their monthly water bill.

Wastewater customers can receive a $180 discount on their annual wastewater service. Open to eligible property owners. 

Sign Up for
Water News

Stay in the loop with news, events, conservation tips and more!

Triunfo News

Triunfo Water & Sanitation District Fills Board Vacancy

July 22, 2026
At its July 15 meeting, the Triunfo Water & Sanitation District (TWSD) board of directors appointed Marc Rashba to fill a board vacancy which resulted from Director Ray Tjulander’s resignation. Rashba will serve through December 4. A new board member will be elected via the...

TWSD Board Vacancy – Notice & Application – June-July 2026

June 10, 2026

The deadline to apply has passed. On August 15, 2026, the TWSD board convened to interview, select and appoint a community member to fill the board vacancy left by Ray Tjulander.

Board Member Ray Tjulander Steps Down After 9 Years

June 10, 2026

After nine years as a member of the Triunfo Water and Sanitation District Board, Ray Tjulander announced he is stepping down effective June 25, 2026.

Create your New Customer Bill Pay Portal Account

February 25, 2026

We observed an unusually high number of late fees in February 2026. This may have occurred because some customers did not see our previous notifications about the new portal (sent by email, bill insert, and website notice.)

Conservation Rebates

SAVE WATER, SAVE MONEY!

Apply for cash rebates on purchases of approved water conservation appliances and devices like:

  • Toilets
  • Washers
  • Irrigation Controllers
  • Soil Sensors
  • Rain Barrels and more!
Mobile phone graphic illustration

Become a pro at water conservation with our

WATER SERVICE CUSTOMER PORTAL

  • Triunfo's customer portal shows your water use in present time.
  • Gives you full data and analytics to track and analyze your water usage.
  • Set up notification limits on your water usage.
  • Be notified if you might have a leak.

My Water Account

High-quality water treatment facility at Triunfo Water & Sanitation District.

Bill Pay

Triunfo Water & Sanitation District offers you a variety of convenient ways to pay your water bill by mail, phone, or online.

Water pressure gauge on a water utility meter at Triunfo Water & Sanitation District.

Water Usage

Manage your water usage with up-to-date information on consumption history by month, day, or hour.

Water utility growth chart with upward trend and dollar sign icon.

Water Rates

Fees for potable and recycled water include a monthly service charge (based on meter size) and quantity rates.

Be Water Wise!

Triunfo Water & Sanitation District is committed to the wise use of water. This includes promoting conservation among our customers through usage guidelines, valuable incentives, and public education. Find out how you can help support your community by conserving water!

Be Water Wise!

Triunfo Water & Sanitation District is committed to the wise use of water. This includes promoting conservation among our customers through usage guidelines, valuable incentives, and public education. Find out how you can help support your community by conserving water!

Quick Links

Event Calendar