Gilroy Plumber for Hard Well Water, Roots and Frozen Lines

The work

Where Gilroy's ground, water and frost put a plumber to work

Roots in the curb-to-house sewer line
Gilroy's Urban Forestry answer on the subject is blunt: roots will not crack a sound sewer or water line, but they will find and exploit a crack or failed joint, and the stretch from the curb to the house is the owner's. Rodding cuts the roots out; a camera run afterward shows where they got in, which decides between a spot repair and a new line. The city will not take out a street tree just because its roots are in someone's pipes.
Water heaters on 237 mg/L water
Furnace and water heater replacements are on the Building Division's list of work that needs a permit, filed through GO Permit. With hardness averaging 237 mg/L, scale and sediment are part of every tank's life here. Gilroy's Pre-Wire guidance also suggests adding an outlet within three feet of an existing water heater, so a heat pump model can go in quickly when the old tank fails; the outlet is an electrician's job.
Wrapping the line from meter to house
The city's freeze guide singles out the pipe between the water meter and the house as the most exposed run in a cold snap, and recommends foam insulation on it and on lines in the crawlspace and attic. It places the house shutoff, usually, directly opposite the meter where the service enters. A shutoff that will not close is worth replacing before winter; if it fails in an emergency, city water staff can close the meter instead.
A new water service from the curb
Water services and sewer services both appear on Gilroy's list of permit work. The city has its own program under way, replacing identified services that have lead connectors, and its water report reminds owners that it cannot control the materials inside a home's plumbing. On an older lot, replacing the owner's run from the curb to the house is permit work, and a sensible time to replace a stiff main shutoff.

Gilroy's original City Hall, built in 1905, on Monterey Street. Photo: Sanfranman59, CC BY-SA 3.0, via Wikimedia Commons.

The houses here

From Eigleberry Street parlors to 1970s tracts, one set of wells

Gilroy's oldest houses, from the 1860s to about 1910, stand on the blocks around Fifth, Church and Eigleberry streets; most of the rest went up from the 1970s on, as the town grew into a bedroom community for Silicon Valley, followed by hillside and golf-course subdivisions. Whatever the age, each house hangs off the same city system: nine wells pumping from the Llagas Subbasin, and a collection network of 167 miles of gravity sewer with more than 14,200 lateral connections. The ownership line falls at the curb, so the sewer and water pipes from there to the house, and whatever roots or cracks are in them, are the owner's to fix.

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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

Gilroy documents a plumbing quote should agree with

Owners own the lines from the curb in
In its answer on tree roots, the City of Gilroy states that property owners are responsible for the water and sewer lines from the curb to the house, and that a root problem in that section needs the owner's own plumber. It adds that Urban Forestry will not remove a tree solely because of roots in lines. Before paying for sewer work, establish with the plumber's camera which side of the curb the defect sits on.
City of Gilroy, Public Works FAQ (opens in a new tab)
Plumbing permits through GO Permit
Gilroy requires a permit for repairs and extensions to plumbing systems, and its Building Division names furnace and water heater replacements, sewer services, water services, landscape irrigation and shower or tub enclosure replacements among the examples. Applications, plan review and inspection scheduling run through GO Permit, the city's online system for permits issued after June 19, 2023. The division asks anyone unsure whether a project needs a permit to call before starting.
City of Gilroy Building Division (opens in a new tab)
What the 2025 water report shows
The City of Gilroy Utilities Department's report for 2025 lists nitrate, tested quarterly, at 3.8 to 8.3 mg/L with an average of 5.4, under the limit of 10. Lead sampling at 30 homes in May 2024 found none over the action level. As part of its lead service line program, the city has replaced 267 of 398 identified services with lead connectors and, as of April 2026, planned to finish the rest within two years.
City of Gilroy Utilities Department (opens in a new tab)

State license for this work: C-36 Plumbing, C-42 Sanitation System. Look up a contractor's license on the CSLB website (opens in a new tab).

Timing

Frost in winter, watering rules the rest of the year

Gilroy averages about 16 nights a year at or below freezing, so late fall is the time to insulate the meter-to-house run, crawlspace and attic lines, and to replace a main shutoff that sticks, before a cold snap tests it. For irrigation, the city's water report suggests outdoor watering one day a week from November through March and three days a week from April through October, which is worth knowing before a plumber resets valves and timers.

Before you hire

Questions for a plumber in Gilroy

Ask the plumber to camera the curb-to-house sewer line and show where roots entered before quoting a whole new line.
Confirm the water heater or sewer permit will be filed in GO Permit under the contractor's own license.
Ask how the quote handles scale from Gilroy's hard water over the heater's life, and what upkeep it expects from you.
If a new irrigation line is planned, ask whether it needs a backflow assembly, since Gilroy requires those tested every year.
Look up the C-36 Plumbing license at cslb.ca.gov before work begins.

Questions

What Gilroy homeowners ask about their pipes and water

Who fixes the sewer line between a Gilroy house and the street?

Up to the curb, the owner does. Gilroy's FAQ says property owners are responsible for the water and sewer lines from the curb to the house, so a crack or root intrusion in that stretch calls for your own plumber. Neighboring Morgan Hill draws the line differently, making owners responsible all the way to the city main.

Is there too much nitrate in Gilroy's tap water?

Not by the drinking water standard. In 2025 the city's wells averaged 5.4 mg/L of nitrate as nitrogen, ranging from 3.8 to 8.3, against a maximum of 10. The report notes that nitrate above 10 mg/L is a health risk for infants under six months and that levels can rise quickly after rain or farming activity, so caregivers of infants may want to ask their doctor.

Does Gilroy still have lead in its water service connections?

Some remain, and the city is replacing them. Its 2025 water report says 267 of 398 identified services with lead connectors had already been replaced, with the rest planned within two years as of April 2026. Tap sampling at 30 homes in May 2024 found no site over the lead action level. Plumbing inside the house is the owner's responsibility.

Our street tree's roots are in our sewer line. Will Gilroy remove the tree?

No. Urban Forestry will not remove a tree solely because of roots in lines. The city's view is that roots exploit cracks or failures rather than causing them, so the lasting fix is a sound line. Have a plumber clear the roots, camera the pipe, and repair or replace the damaged section between the curb and the house.

Where does Gilroy's sewage go, and why does the city care what goes down the drain?

It flows to the South County Regional Wastewater Authority plant, run jointly with Morgan Hill. Part of the treated water is recycled for parks, golf courses and farms; the rest goes to percolation ponds and soaks back into the underground aquifer, unlike many Bay Area plants that discharge to the Bay. Gilroy asks residents to keep fats, oils and grease out of drains, where they harden and block pipes.

Keep exploring

More on plumbing work and Gilroy

Other trades in Gilroy

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.

Plumbing on Gilroy's nine-well system, from the curb line to the tap

Where Gilroy's ground, water and frost put a plumber to work

Roots in the curb-to-house sewer line

Water heaters on 237 mg/L water

Wrapping the line from meter to house

A new water service from the curb