Drain Cleaning in Sunnyvale, CA

A Homeowner’s Guide to Drain Cleaning in Sunnyvale

One clogged drain or the whole house?

A single slow sink or tub has a clog in its own trap or branch line, inside the house: that’s always a plumber’s job. When several fixtures back up together, water rises in the tub when you flush, or the cleanout in the front yard overflows, the blockage is in the main drain, the lateral or the City’s sewer main. For that, Sunnyvale asks you to call the City first.

Call the City before a plumber

The City’s 24-hour Sewer Response Service is 408-730-7400, the same line that takes water and storm drain problems. Its instructions for a backup:

1. Turn the water off and stop flushing, showering and doing laundry until the source is found.
2. Call the City before anyone else.
3. The City says it responds within two hours and helps work out which part of the system is causing the problem if it isn’t the main.

The City maintains all sewer mains by flushing, video inspection, manhole repair and blockage removal. If the main is clear and the clog is in your line, that’s where we come in, usually from the cleanout with a cable machine, or with hydro jetting for grease and roots.

Who clears which part of the lateral

Sunnyvale’s 2020 Sewer System Management Plan splits each lateral in two: the upper lateral, from the house to the public right-of-way, and the lower lateral, from there to the main. The right-of-way usually starts at the curb face and runs about 11 feet onto the lot.

• In general, the lateral is the owner’s. The City says so on its sewer page.
• Courtesy clearing. In some cases where a property-line cleanout is installed, the City removes a blockage in the lower lateral. The management plan ties this to a cleanout City crews and equipment can reach, so keep the box uncovered.
• Broken pipe or street tree roots. Council Policy 3.3D.6 has the City repair the section between the property line and the main when that’s the cause.

A replaced sewer line must include a one-way cleanout at the property line, in a Christy G-5 box under paving or an F-8 box in planting. See sewer line repair in Sunnyvale.

Roots: Sunnyvale’s top cause of sewer spills

In the City’s records from 2009 through 2019, roots caused more sewer overflows than grease, debris and pipe failures combined. The City notes that laterals with weak joints or cracks are prone to roots growing inside them, and tells owners to discuss repair options with their plumber.

Chemical shortcuts are limited: SMC 12.12.115 bans root killers containing more than 5% copper from the sewer. Roots are cut out with a rooter or scoured out with a jetter, and a camera inspection afterward shows whether the joint they came through needs repair.

Grease, wipes and the split cart

Sunnyvale’s advice is blunt: only water should go down the drain. Grease buildup causes backups and overflows, and home garbage disposals don’t keep it out of the pipes. What the City asks instead:

• Pour cooled cooking oil into a clear plastic bag with your food scraps, for the food side of the split cart or a food-scraps bin.
• Scrape meat drippings, dairy and sauces into the same bag, and use a sink strainer.
• Take larger amounts to the SMaRT Station in one-gallon screw-top jugs, up to ten gallons per visit; single-family homes can put two jugs beside their carts on collection day.

For toilets, the City calls flushable wipes one of the biggest causes of sewer backups. Wipes, floss, feminine products, wrappers and paper towels all go in the trash.

Backwater valves

Where a house is served by a pump, or its finished floor is 12 inches or less above the rim of the nearest upstream manhole, the City’s sewer guidelines require a backwater valve just upstream of the right-of-way cleanout, in a box visible from the street. The owner maintains it. Building drains, sump pumps and area drains may not connect to the sanitary sewer.

For our other services in the city, see plumbing in Sunnyvale.

Sources

City of Sunnyvale: Sewer · Phone Directory · 2020 Sewer System Management Plan · Council Policy Manual, Policy 3.3D.6 · Sanitary Sewer Design Guidelines (September 2023) · Residential water/sewer pipes brochure (rev. 1/2026). Sunnyvale Municipal Code: Chapter 12.12, Sewer Use Regulations (12.12.115). Checked November 2026.