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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!

TWSD CALENDAR

Check the calendar for office closures, board meetings, events and more.

You can also download this year's closure calendar!

PURE WATER PROJECT

Construction on the Las Virgenes - Triunfo JPA Pure Water Project  is underway.

All the work to come will deliver our fist local source of water.

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. 

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Water News

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

Triunfo News

Reminder to Water Customers: Create your New Customer Bill Pay Portal Account

February 25, 2026
LATE FEE NOTICE: Your account may have been charged a late fee in February. We observed an unusually high number of late fees in February. This may have occurred because some customers did not see our previous notifications about the new portal (sent by email,...

Triunfo Water & Sanitation District 2025 Year in Review

February 5, 2026
Message from the Board Chair As we close out another year at Triunfo Water & Sanitation District, I want to take a moment to reflect on our progress, recognize the dedication of our staff, and look ahead to a strong and resilient future for our...

2026 MWD Calendar Now Accepting Submissions

February 4, 2026
Calling all Oak Park K–12 artists! We're inviting local students to show what "Being Water Wise Is…” through original, water-themed artwork for the Metropolitan Water District of Southern California’s annual calendar contest. Selected art could be featured in a professionally printed calendar and digital gallery—plus students...

Customer Bill Pay Portal is Live

January 29, 2026
The new and improved Customer Bill Pay Portal is now live. We made these necessary upgrades to provide a more reliable and secure way to manage your account and pay your water bill. ONLINE BILL PAY* You can now access One-Time Payment AND your Customer...
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