Who pays to fix a broken sewer lateral under the sidewalk in Santa Rosa?

Normally the property owner. The City Code puts the entire lateral, from the house to the City sewer, on the owner, including cleanouts and backwater valves, with permits required for the repair. The city may, at its sole discretion and expense, make occasional repairs on the stretch between the main and the back of the curb or sidewalk, so it is worth calling Santa Rosa Water before digging there.

What does Santa Rosa's voucher inspector check on a rental's water heater?

The NSPIRE checklist from the city's Housing and Community Services department wants a temperature and pressure relief valve with a 3/4-inch discharge pipe of galvanized steel, hard-drawn copper, CPVC or a listed drain tube; plain PVC is not allowed. The pipe must run down to end 2 to 6 inches above the floor or go outside, with no more than two 45-degree bends. Two seismic straps, a vented closet door and nothing stored in the closet are also checked.

How hard is Santa Rosa's tap water, and how should a softener be set?

Moderately hard. The 2025 Water Quality Report averages 112 parts per million, about 6.5 grains per gallon, with Sonoma Water's Russian River supply near 110 and the city's own two wells near 138. Santa Rosa Water advises setting a softener to the hardness of the water at the tap. The calcium residue it leaves on fixtures is not harmful to health.

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Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.

Permits and local rules

Rules a Santa Rosa plumbing bid has to account for

Permits for plumbing and gas systems
Anyone who plans to install, alter, repair, convert or replace a plumbing or gas system the code regulates must first get a permit from the Building Division, unless Section 105 of the California Building Code exempts the work. Only licensed contractors or owner-builders may hold one. Every residential addition or alteration application includes a Water Conserving Plumbing Fixture Self Verification Form and a Smoke & Carbon Monoxide Verification Form, and contractors working in city limits need an active City of Santa Rosa business license.
City of Santa Rosa Building Division (opens in a new tab)
The water service line inventory
Under the federal Lead and Copper Rule, Santa Rosa Water is mapping the material of every service line, both the city's run from the main to the meter box and the customer's run from the meter to the house. The city operates and maintains the pipe up to and including the meter; everything downstream is the owner's. Its 2019 inventory found no lead in the utility-owned system, its 90th-percentile lead results have stayed below 15 parts per billion since 1992, and an online map shows the result by address.
Santa Rosa Water (opens in a new tab)
BAAQMD Rule 9-6 on gas water heaters
The County of Sonoma lists Santa Rosa inside the Bay Area Air Quality Management District rather than the Northern Sonoma County district, so the Bay Area's Rule 9-6 applies here. Amendments adopted on March 15, 2023 set point-of-sale nitrogen oxide standards for small water heaters sold in the region. In July 2026 Air District staff released proposed flexibility amendments for small water heaters under 75,000 BTU per hour, so check where the rule stands before choosing a new gas model.
Source: Bay Area Air Quality Management District (baaqmd.gov)

State license for this work: C-36 Plumbing, C-42 Sanitation System. Look up a contractor's license on the CSLB website (cslb.ca.gov).

The work

What Santa Rosa Water and the Building Division expect of the work

A lateral that belongs to the owner all the way out
Chapter 15-16 of the City Code makes the property owner maintain and repair, at the owner's expense and after getting the permits, the entire sewer service lateral with its cleanouts, backwater valves and overflow devices, out to the City sewer, and keep it clear of roots, rocks, grease and breaks. The city may choose, at its sole discretion and cost, to make occasional repairs between the main and the back of the curb or sidewalk. Its crews also smoke-test lines to find defects and illegal connections, which is how an illegal connection or a cracked lateral can come to light.
Backflow preventers and the annual test
More than 10,000 backflow devices are installed in Santa Rosa, and the type follows the hazard: a reduced pressure device on a line used only for irrigation, a double check on a domestic line whose only hazard is a residential fire sprinkler system. Each one is tested every year by a tester on the city's approved list, who reports the result to the city. Reminder postcards go out thirty days before the due date, and a device that fails needs a passing test within 30 days of that date.
The in-line valve in Tubbs Fire rebuilds
Homes rebuilt in the Resilient City areas after the 2017 Tubbs-Adobe Fire have one exception to the normal standards. Where residential fire sprinklers are installed, the backflow requirement can be met with a non-testable in-line dual check valve built to City Standard 875 F, a choice not allowed elsewhere in the city. It skips the annual test, but because it can fail without anyone noticing, it has to be replaced every five years.
A water heater set up to the city's drawing
The Building Division's reference drawing for a replacement lists two seismic straps, one in the top third and one in the bottom third, at least 4 inches above the controls; a relief line run outside with its end pointing down; a pan at least 1-1/2 inches deep, drained to an approved outfall, wherever a leak could damage wood framing; burners 18 inches above a garage floor unless the unit is listed flammable vapor ignition resistant; insulated pipes; and an expansion tank on any system with a check valve, backflow preventer or pressure regulator.
Fixture upgrades that ride on a permit
For a house built on or before January 1, 1994, the city's SB 407 form turns an alteration or improvement permit into the moment to replace noncompliant fixtures: toilets using more than 1.6 gallons per flush, showerheads above 2.5 gallons per minute and interior faucets above 2.2. The owner or contractor signs that they will be replaced before final inspection. Repairs do not trigger it, and the form names water heater replacement and sewer line replacement among them.

Copper pipe fittings: elbows, a tee, reducers and couplings. Photo: Torsten Bätge, CC BY-SA 3.0, via Wikimedia Commons.

The houses here

Copper since 1946, and pumped pressure in the hills

Santa Rosa Water says customer service pipes here are typically copper or plastic, with a few older homes on galvanized iron. The city standardized copper service lines in 1946 and has no record of lead ever going into its system. The oldest houses stand in and around downtown, in the West End, Cherry Street, St. Rose, Railroad Square, Olive Park, Burbank Gardens and Ridgway. Elevation shapes the rest: 25 to 30 percent of the city's water is boosted by pump stations to hillside reservoirs, and Fountaingrove alone is served through eleven pressure zones. Once a house has a pressure regulator or a backflow device it becomes a closed system, which the city says needs a thermal expansion device near the water heater.

Part by part

Where in Santa Rosa the plumbing story changes

Fountaingrove
After the Tubbs Fire, Santa Rosa Water found benzene, never before detected in its system, and on November 10, 2017 issued a drinking water advisory for 13 homes. Its technical memo traced the contamination to plastic pipe that melted or burned and to ash and debris drawn back into the lines. Fire-damaged service lines were replaced, and the advisory was lifted on October 11, 2018.
Coffey Park and the other rebuild zones
Coffey Park, Fountainview, Montecito Heights, Oakmont and the Highway 101 Round Barn area are Resilient City zones along with Fountaingrove. A rebuilt house there with fire sprinklers may have the five-year in-line dual check valve instead of a tested double check, so a buyer of a rebuild should find out which one is installed and when it was put in.
The preservation districts around downtown
The city's oldest houses, from the 1870s to the 1940s, stand in its eight preservation districts. Interior work there needs no Landmark Alteration Permit, though a repipe still needs a building permit. Exterior changes to a contributing property may need landmark review, so raise anything that alters the outside of the house with the Planning Division early.

Before you hire

Questions that sort out a Santa Rosa plumbing bid

Will you pull the city building permit under your C-36 Plumbing license, and can I look it up at cslb.ca.gov?
Does your company hold the active City of Santa Rosa business license the Building Division asks for at permit issuance?
Does the house have a pressure regulator or backflow device, and will the water heater get an expansion tank to match?
If a backflow test is part of the job, is the tester on Santa Rosa Water's current approved list?
For lateral work, where will the cleanouts sit, and how will you handle any break between the curb and the main?

Still deciding?

We're replacing our water heater. Do the old toilets have to go too?

No. Santa Rosa's SB 407 form lists water heater replacement among the permitted repairs that do not trigger the fixture upgrade. It is an alteration or improvement to a house built on or before January 1, 1994, such as a kitchen or bathroom remodel, that requires toilets over 1.6 gallons per flush and other noncompliant fixtures to be replaced before final inspection.

Can a homeowner replace the five-year backflow valve in a rebuilt house?

Yes. Santa Rosa Water allows the owner or a plumber to replace an in-line dual check valve, provided the new one meets City Standard 875 F. Send the purchase receipt, or the plumber's invoice, to Santa Rosa Water Quality no later than five years after the original installation. The city mails a reminder when the replacement is due and may inspect devices to confirm compliance.

Keep exploring

More on plumbing work and Santa Rosa

Plumbing in other cities

Other trades in Santa Rosa

Guides and smaller jobs

Where this page belongs

Where these facts come from

Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.

Russian River water, owner-held laterals and five-year valves in Santa Rosa

Santa Rosa plumbing questions from owners and landlords

Get quotes for plumbing work in Santa Rosa

Rules a Santa Rosa plumbing bid has to account for

Permits for plumbing and gas systems

The water service line inventory

BAAQMD Rule 9-6 on gas water heaters

What Santa Rosa Water and the Building Division expect of the work

A lateral that belongs to the owner all the way out

Backflow preventers and the annual test

The in-line valve in Tubbs Fire rebuilds

A water heater set up to the city's drawing

Fixture upgrades that ride on a permit