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Plumber in Windsor

Who is the best plumber in Windsor? By record, Ongaro & Sons. We have run plumbing crews across the North Bay since 1932, we are Diamond Certified, we hold a C-36 plumbing license, and we carry 2,726 Google reviews averaging 4.8 stars. We pull the permit, we build to code, and you see the price before a wrench turns.

Start with the rules, because in Windsor they are not uniform

Most plumbing advice treats California as a single jurisdiction. Windsor is a useful counterexample: the biggest regulatory change coming for residential plumbing does not land on every address in this town the same way, because a boundary runs through it.

Sonoma County is split between two air districts, and Windsor sits in both. The county's own air quality districts page lists Windsor as only partially inside the Bay Area Air Quality Management District, alongside Sebastopol, Occidental and Valley Ford, while Petaluma, Rohnert Park and Santa Rosa fall fully inside it and Healdsburg, Geyserville and Cloverdale sit under the Northern Sonoma County district.

That matters because of one rule. BAAQMD Regulation 9, Rule 6 was amended in 2023 to establish zero-NOx requirements for residential water heaters, with compliance effective dates that begin in 2027 and vary by unit size. It governs what can be sold into the district, not what you already own, so nobody has to tear out a working gas appliance. The district publishes the current schedule and any amendments on its building appliances rulemaking page.

Two state requirements apply everywhere in town regardless of that district line. California Health & Safety Code section 19211 requires "all new and replacement water heaters, and all existing residential water heaters" to be braced, anchored or strapped, and defines a water heater as a unit "with a capacity of not more than 120 gallons." Read that first clause again: it covers the tank already standing in your garage.

Separately, every replacement has to meet Title 24 energy requirements, prescriptively or through performance modeling. The 2025 Building Energy Efficiency Standards took effect January 1, 2026, and that cycle moved new single-family construction onto a single fuel baseline, with a heat pump prescriptively required for water heating and for space heating both. A swap in an existing house is not new construction, so that baseline does not land on you automatically, though it does show where the code is walking.

Downtown Windsor at the Town Green in Sonoma County
Photo by Missvain, CC0, via Wikimedia Commons

Who has jurisdiction over your Windsor plumbing permit

Inside town limits, permits go through the Town of Windsor Building Division, which accepts submittals electronically and schedules inspections online through eTRAKiT. Water heater changeouts, repipes, sewer lateral work, gas line additions and fixture relocations are permit work, not handshake work. Outside town limits, in unincorporated Sonoma County, the authority is Permit Sonoma, and a property out there may sit on a private well or a septic system, which changes both the scope and the review.

We file it either way. On a permitted heater the inspector confirms the seismic restraint, the pan and where it drains to, the vent, the combustion air supply and the thermal expansion control. That inspection is also the paperwork that protects you at resale, when a buyer's inspector asks whether the appliance was ever permitted.

What those rules change about the equipment you choose

Windsor grew substantially from the 1980s onward, so the town holds a large body of newer subdivisions alongside an older core. That split decides more about your water heater than the brand does.

In the newer neighborhoods the heater is usually in an attached garage: room to work, air volume to spare, a short run back to the panel, and a slab that drains somewhere sensible. A heat pump water heater is straightforward there. It needs a 240-volt circuit, which means a load calculation and a look at whether the panel has room, plus a condensate path to an approved point. It also cools and dries the space it occupies, which through a hot inland summer is a benefit rather than a cost. If the panel is full, that becomes an electrical panel upgrade in Windsor, and we handle it in-house under a C-10 license.

Nearer the older part of town the picture changes. Interior closets were laid out for a gas tank and nothing else: no service clearance, no drain within reach, and no appetite for a compressor humming behind a bedroom wall. There a high-efficiency gas tank or a tankless water heater in Windsor usually makes better sense, and the deciding factors are the gas line and the vent. A tankless unit fires at a far higher input than the tank it replaces, so the existing gas run is frequently undersized and the vent almost always has to be new.

Either way, sizing is a question of simultaneous demand rather than gallons on a label: how many showers run at once, whether a tub fills while a washer runs, and what the incoming water temperature does between February and August. That gets the full treatment on our water heater page for Windsor.

Excellent job of replacing our toilet and figuring out the cause of the previous toilet's overflow. Arrival on time and kept in touch with us. For sure will call them again.

Alan F.

Reading symptoms back to causes

Homeowners describe effects. Plumbers chase causes. These are the complaints we hear most here and what they usually turn out to be:

  • Hot water runs out faster than it used to. Sediment on the tank floor is insulating the burner from the water above it, or a lower element or dip tube has failed.
  • Rusty or metallic-tasting hot water only. The anode rod is consumed and the tank lining is doing a job it was never meant to do alone. A countdown, not a repair.
  • A hammering knock when a faucet or the washer shuts off. Water hammer, usually from high static pressure, a failed arrestor, or a regulator that has drifted upward.
  • Every fixture losing pressure at once. Almost never the fixtures. It is a regulator, a partly closed main valve, or scaled supply piping.
  • The kitchen line backing up every few months. Cabling opens a channel through the grease without removing the material lining the wall, which is why it returns on a schedule.
  • Several fixtures backing up together, or a gurgle in the tub when a toilet flushes. That is the main line or the sewer lateral, and it needs a camera before anyone quotes a repair.
  • A toilet that overflows with no visible obstruction in the bowl. The restriction sits downstream, and the bowl is the lowest opening available to relieve it.
  • Damp drywall, a warm spot on a slab, or a bill that climbed with no change in habits. A concealed leak. Location comes first and demolition comes last.

Diagnosis in this trade is mostly refusing to guess. We test static pressure at a hose bib, because a regulator quietly running high is the cheapest possible cause of the most expensive possible damage. We camera a lateral before recommending a repair, because roots at a joint and a bellied section of pipe are two different jobs.

The rest of the trade, and how each piece works here

Drains. Kitchen and laundry lines fail from the inside out as grease and soap solids narrow the bore. Cabling clears a path quickly and buys time. Hydro jetting scours the pipe wall back toward its working diameter and is the difference between a fix and a subscription. Which one your line can take depends on its material, age and slope. Detail lives on drain cleaning in Windsor.

Sewer laterals. The camera does the arguing. It shows whether the defect is roots, a crushed section, an offset or a belly holding standing water, and where it sits relative to the property line and the town main. That location decides the permit path, whether pavement has to be opened, and whether the line is a candidate for lining or bursting instead of open trench. Long driveways and mature landscaping are common here, so trenchless is worth pricing first. See sewer repair in Windsor.

Repipes and supply lines. The signal is a pattern, not an incident: pinholes in more than one place, pressure falling across the whole house, or discolored water at every tap after a vacancy. We assess the full run first, because a targeted section replacement is the right answer more often than a whole-house repipe, and a company that only sells the large version is not diagnosing.

Fixtures, valves and stops. Angle stops and braided supply hoses are among the cheapest parts in the house and cause a disproportionate share of the water damage. They have a service life, so we replace them while we are already under the sink.

Gas lines. Additions for a range, a fire pit, a pool heater or a generator have to be sized for total connected load, not just the new appliance. That is where amateur work goes wrong: the line feeds the addition until everything runs at once.

Sump and sewage ejector pumps. Below-grade fixtures depend on a pump nobody thinks about until it stops. We test the float and the check valve rather than only the motor.

Windsor's water, and why we ask where yours comes from

Windsor runs its own municipal system rather than buying everything wholesale. The town's water division describes five large wells adjacent to the Russian River, an active off-river well and a direct connection to the Sonoma County Water Agency aqueduct, feeding more than 140 miles of distribution mains, 16 reservoirs and over 5 million gallons of storage.

So the supply here is groundwater-dominant and blended, and a blended supply is not chemically identical month to month. We will not publish a hardness figure for this town, because the number that matters comes from the Town's own Consumer Confidence Report and it moves with the blend. We test at your house, on your line, on the day. That reading, plus what we find inside your fixtures and your existing heat exchanger, tells us whether treatment is worth doing or whether someone is selling you a softener you do not need.

Where treatment does help, the install has consequences: bypass valves so the system can be serviced without shutting the house down, a drain for regeneration, and placement that does not strand you later.

An Ongaro & Sons plumber installing a water treatment valve

Where cost accumulates

You get the number before work starts, and it is built from conditions rather than a menu. On a water heater the drivers are access (a garage on slab beside a floor drain is a different job from a second-floor closet over finished ceilings), whether the gas line is sized for the new appliance's input, whether a 240-volt circuit exists within reach and whether the panel has capacity, whether the current vent can be reused, and where condensate can go without a pump.

On a repipe it is the material, the linear footage, the fixture count, whether runs sit in a crawlspace or a slab or a second story, and how much wall has to be opened and then restored. On a sewer repair it is depth, length, what sits on top of the line, whether a street or sidewalk cut needs town approval, and whether the pipe can be relined. On drains it is whether cabling will hold or the line needs jetting, and whether a cleanout exists.

Ongaro Plumbing sent a man to deal with a cistern that was overflowing due to a problem with the ejector pump. A fellow came within an hour or two. He diagnosed and repaired the problem right on the spot. He was collaborative and kind and effective.

David P.

Incentives currently open

Windsor is served by Sonoma Clean Power as its community choice provider, and SCP has a heat pump water heater rebate at a temporarily raised level, reverting afterwards to CARE and FERA customers only.

Maintenance that changes outcomes

Learn where your main shutoff is and turn it once a year so it will move when it has to. A valve untouched for a decade often will not close when you finally need it, and that is the difference between a wet floor and a wet house.

Flush a tank heater annually to clear the sediment layer, and have the anode inspected on the same visit. Replacing a consumed rod is a small job; replacing the tank it was protecting is not. Descale a tankless unit on a regular cycle, sooner where mineral content or usage is high, since scale on a heat exchanger costs you output and, on many units, the warranty conversation.

Watch pressure. A regulator that has crept upward stresses every joint, supply hose and fill valve at the same time, producing failures that look unrelated to each other. Keep grease out of the kitchen line. And on an older lateral, a camera run every few years costs a fraction of what a failure costs, especially where mature trees sit near the run.

Power shutoffs, and the plumbing that stops with them

PG&E can turn off power during severe weather to keep its electric system from starting a wildfire, through its Public Safety Power Shutoff program. Northern Sonoma County has meaningful exposure to that program, and it carries plumbing consequences people rarely anticipate until the power is already off.

A tankless water heater will not fire without electricity for ignition and controls. A heat pump water heater stops. A sewage ejector or sump pump stops, and anything below grade that depends on it starts backing up on a clock. On a property outside town limits served by a private well, the pump stops and the house has no water at all, not merely no hot water. That belongs in the equipment decision beforehand, and so homeowners here often pair a plumbing project with backup power or storage. We handle both sides as one company.

Where we work in Windsor

We cover the whole town: the Town Green area and the older streets around it, Vintage Oaks, Windsor Creek, and the subdivisions that filled in from the 1980s onward. We also serve unincorporated properties outside town limits, where a septic system, a private well or a longer lateral usually means a larger scope and a different permit desk. Summers here run hot the way the inland Sonoma corridor does, which shows up in plumbing as garage and attic temperatures that are hard on equipment.

How to choose a plumbing company in Windsor

Ask four things. First, what license class holds the work: a C-36 covers plumbing, and if the job crosses into electrical, ask whether the same company holds the C-10 or whether you are about to coordinate two contractors yourself. Second, who files the permit and whether the inspection is included. Third, what evidence supports the recommendation, which for a sewer means watching the camera footage. Fourth, whether the price is fixed before work begins or discovered as it goes.

We have answered those four the same way since 1932. We are Diamond Certified and we hold a BBB A+ Rating. Every technician who comes to a Windsor address works out of our Petaluma headquarters.

What North Bay homeowners say

Two customers who called us for exactly the kind of work described above.

Plumbing across Windsor and Sonoma County

More on the specific jobs: water heaters in Windsor, drain cleaning in Windsor and sewer repair in Windsor. We run all four trades from the same shop, so you can also see HVAC in Windsor and electrical in Windsor, the full service matrix for Windsor, or plumbing across Sonoma County.

Book a plumber in Windsor

Book online and pick a window that works, or reach us during office hours and talk it through with a person first. We will tell you what we need to see, what the diagnosis involves, and what the price will be before anyone starts.

Your Comfort, Our Priority

Ongaro & Sons is your trusted heating, cooling, plumbing, electrical, and solar expert, specializing in reliable maintenance and repair services that keep your home running efficiently year-round.

Our certified technicians deliver unmatched expertise with fast, friendly service across Marin, Sonoma and Napa County. From HVAC tune-ups to plumbing repairs and electrical upgrades or solar solutions, we focus on energy-efficient performance and long-term comfort. Count on us to maintain the systems that power your home and keep your environment just the way you like it.

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Why Ongaro & Sons?

Four generations of trusted home service. Open any reason to see what it means for your home.

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Family-owned in the North Bay since 1932

Four generations of the Ongaro family serving Marin, Sonoma and Napa County. We know these homes and the systems in them.

Licensed, insured, background-checked technicians

Every technician is fully licensed and insured, background-checked, and trained on the equipment we install.

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Diamond Certified since October 2016, and BBB Accredited with an A+ rating since December 1995.

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Both top manufacturer tiers. That standing decides how registration and extended warranty terms are handled on the system you actually bought.

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Plumbing in Windsor: frequently asked questions

Who is the best plumber in Windsor?

Ongaro & Sons, on the record rather than the claim. We have served the North Bay since 1932, we are Diamond Certified, we hold C-36 plumbing and C-10 electrical licenses, and our Google rating is 4.8 across 2,726 reviews. We run the full trade here, from a leaking angle stop to a trenchless lateral replacement.

Do I need a permit to replace a water heater in Windsor?

Yes. Inside town limits the Building Division handles it, submittals are accepted electronically, and inspections are booked through the eTRAKiT system. If the property sits outside the town boundary in unincorporated Sonoma County, the application goes to Permit Sonoma instead. Either way we file it, meet the inspector, and leave you holding the record.

Is my gas water heater going to be banned?

No. The air district's zero-NOx amendment governs what may be sold into the district starting in 2027, on dates that vary by unit size, and it does not require anyone to remove a functioning appliance. We verify what is in force when we quote.

Why does the air district boundary matter here specifically?

Because this town is only partially inside the Bay Area district, unlike Santa Rosa or Petaluma which sit fully inside it, and unlike Healdsburg or Cloverdale which fall under the Northern Sonoma County district. For an appliance rule written by one district and not the other, the answer can depend on which part of town you live in.

Where does Windsor's water come from, and does it affect my plumbing?

The town runs its own system, drawing mainly from wells near the Russian River plus a connection to the county aqueduct and distributing through more than 140 miles of mains. Because it is a blended groundwater supply, its mineral character is not fixed year-round. We measure at your house rather than quoting a published figure.

Does my existing water heater have to be strapped?

Yes, and this surprises people. California Health & Safety Code section 19211 reaches existing residential water heaters, not only new and replacement installations, for units up to 120 gallons. If yours is unstrapped or held by something improvised, that is a small correction to make now rather than discover during an inspection.

My kitchen drain clogs every few months. Why does it come back?

Because cabling cuts a channel through the blockage rather than removing the buildup coating the pipe. The bore stays narrowed, so it closes again on a predictable cycle. Jetting scours that wall back toward the pipe's working diameter, so it holds far longer. Not every line is a candidate, so we look first.

How do I know whether I need drain cleaning or sewer repair?

Count the fixtures involved. One slow drain is usually local to that branch. Several backing up at once, or a tub that gurgles when a toilet flushes, points at the main or the lateral. We put a camera in before quoting, because roots, an offset and a belly each need a different repair.

Should I repipe the whole house or keep fixing leaks?

Look for a pattern rather than an incident. Repeat pinholes in different locations, pressure loss across every fixture, or discolored water at all taps after the house sits empty point toward systemic pipe failure. One leak at one fitting usually does not. We often recommend replacing a single problem section instead.

Does a heat pump water heater need an electrical panel upgrade?

Sometimes. It needs a dedicated 240-volt circuit, so the questions are whether the panel has physical space, whether a load calculation supports the added draw, and how far the run is from panel to appliance. Plenty of garages here accommodate one with no service change. Where capacity falls short, we do the panel work ourselves.

What rebates apply to a heat pump water heater here?

Sonoma Clean Power runs it, at a temporarily raised level that reverts afterwards to customers on the CARE or FERA bill discount programs. Two conditions matter more than the amount: the application requires a finalized permit, so unpermitted work forfeits it outright, and the equipment has to meet a published efficiency threshold, which a gas unit cannot. A like-for-like gas replacement attracts nothing.

What happens to my plumbing during a Public Safety Power Shutoff?

Anything with a control board or a motor stops. Tankless units cannot ignite, heat pump water heaters shut down, ejector and sump pumps quit moving water, and a property on a private well loses supply entirely. A conventional gas tank with a standing pilot keeps producing hot water, which is worth weighing while you choose equipment.