A pipe that is spraying right now gets a plumber sent today, not an appointment for Thursday. The truck carries copper, PEX, shark-bite couplings, water heater fittings, a drum machine and a sectional cable, so the leak is usually stopped and the repair finished on that first visit. You hear the repair price before anything is cut.
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Water escaping into a house is not something you schedule around. It gets shut off, priced, and repaired on the same visit.
Active leaks, sewage indoors and a house with no supply are routed first. The plumber arrives with pipe, fittings and a drain machine already loaded, so the fix happens on that visit.
You are told the trip charge before a truck leaves and the repair total once the fault is found — not after a wall is open. A smaller job than expected is billed as the smaller job.
Galvanized supply lines, cast iron drains, root-packed laterals and scale from hard groundwater. The failures in this city are specific, and so is what gets loaded to fix them.
Coverage runs across Santa Clara County, from the older flatland tracts to the hillside subdivisions on both sides of the city.
There is nothing to fill in. The work is quoted before any of it starts.
Close the main valve or the one at the meter if anything is spraying. Then say what is wet, what is still running, and what you already turned off.
Those four point at four different sets of tools. A couple of questions decides whether a cable machine, a repair coupling or a service line crew needs to be on the truck.
Emergencies go out now. Everything else gets a real window. You will know which of the two you have before the call ends.
Illustrative photographs of the kinds of work described on this page. No specific San Jose property is shown.
San Jose houses were plumbed across seven decades with four different materials. Four things decide what gets loaded before the truck leaves.
An active leak is priced and scheduled differently from a drip, because the cost of waiting is drywall and flooring. Say whether you got the main closed.
Galvanized steel, cast iron, copper and PEX each fail their own way and each need their own fittings. The build era of the house is the fastest clue to which one is in the wall.
A trap, a branch, the building drain, or the lateral out under the sidewalk. Each step further out means a bigger machine, and past the property line it becomes a permit and inspection job.
An accessible property-line cleanout is the difference between reaching the lateral in minutes and pulling a toilet to get in. If you know where yours is, mention it.
Four failures account for most of the after-hours calls out of San Jose. Each one is explained in full below, including what to shut off before anyone arrives.
Water under pressure does damage by the minute, so the shutoff comes before the phone. Most San Jose houses have a main valve where the water service enters — commonly a gate or ball valve near the front hose bib, inside the garage wall, or in a box at the front of the lot. Turn it clockwise until it stops. If the valve is a corroded gate valve that spins without ever sealing, which is common on the older side of town, go out to the meter box near the sidewalk and shut the valve on the house side of the meter. A meter key or a good pair of channel locks does it. Then open the lowest faucet in the house to bleed pressure out of the system, and cut power at the breaker to anything the water is running near. If the leak is inside a wall or above a ceiling, get everything out from underneath it before the sheetrock lets go. What actually split matters for the repair. Galvanized steel supply piping, standard in the tracts built before the 1960s, fails from the inside out and shows up as a rusty pinhole spray at a threaded joint. Copper installed through the 1970s and 1980s pits and weeps at solder joints, and San Jose's hard groundwater accelerates the scale that hides those pits until they blow. A single split length is a section repair. Three pinholes in one week on the same run is a repipe conversation, and you should be told which one you are looking at rather than sold the bigger job by default.
One fixture backing up while everything else drains normally is a local blockage — the trap, the branch arm, or the first few feet past it. Kitchen sinks in this city clog with the same two things: hardened grease, and food packed against a scaled-up pipe wall. Stop running the disposal. Grinding more food into standing water gives the plumber a bucket to bail before anything else can happen. Bail the sink down to a few inches yourself if you can. Two or more fixtures backing up at once is a different animal. That means the blockage is downstream of both, in the main building drain or out in the lateral, and the water has nowhere to go but the lowest opening in the house — usually a shower pan or a garage floor drain. Stop using every fixture in the building, including toilets and the washing machine, until it is cleared. Do not pour a caustic drain product down a line that is already full. It sits there in standing water, it does not reach the clog, and it turns a straightforward cable job into one where the plumber is working over a pipe full of hot lye. If you already poured it in, say so on the call so the right protection comes along. Clearing it means picking the right machine for the pipe. A hand-fed drum machine handles a sink or tub branch. A sectional machine with a cutter head goes out to the street through a cleanout. Cast iron drain lines, standard in the pre-1960 San Jose housing stock, build up an internal scale ledge that catches everything, and a cable that only punches a hole through the blockage leaves you calling again in a month. Camera work after the cable is what tells you whether the pipe itself is the problem.
This one is a health problem, not just a plumbing problem. Raw sewage surfacing in a shower pan, a floor drain or the lowest toilet means the sewer lateral running from your house out to the city main is blocked or broken. Stop all water use in the building immediately — every flush, every load of laundry, every dishwasher cycle adds to what is already coming up. Keep children and pets out of the affected rooms and do not run a shop vac over it without proper gloves and a mask. In San Jose the responsibility split is worth knowing while you are standing there. The city's sanitary sewer FAQ states that the property owner is responsible for maintaining the entire lateral, and that the city will maintain the lower portion from an approved property-line wye cleanout out to the main only as a courtesy, and only when that cleanout exists and sits within five feet of the property side of the sidewalk. If nobody has ever installed one on your lot, all of it is yours. That single fitting is also the access point a plumber needs to reach the line properly, which is why installing one often pays for itself the first time it is used. Roots are the usual cause here. Mature street trees over clay or cast iron lateral joints send hair roots into every gap, and they come back on a cycle. Grease and wipes finish the job. A cable clears it today. A camera run after the cable tells you whether you have a root intrusion that needs cutting each year, a bellied section holding water, or a collapsed line that needs replacing. A plumbing permit is required to repair or replace a building sewer in San Jose, and to install a property line cleanout, so that part is a scheduled job with an inspection, not something done quietly at midnight.
Start by checking whether it is only your house. Ask a neighbor or look for a utility crew on the street. San Jose Water and the city's municipal system both do unplanned shutdowns for main breaks, and there is nothing to repair on your side if that is what happened. If the block has water and you do not, walk the line from the street inward. Open the meter box by the sidewalk and look at the dial. Spinning with every fixture closed means water is escaping between the meter and the house — a failed underground water service, often the original galvanized or poly line, and it usually shows as a soft wet patch or unexplained green grass in the front yard. A dial sitting perfectly still means the water is stopping before it gets moving: a main valve accidentally left closed, or a water service that has finally rusted shut internally. Two more things to rule out. If it is only hot water that is gone, that is the water heater, not the service line. If the pressure dropped over months rather than vanishing overnight, that is scale narrowing galvanized pipe from the inside, which is a repipe rather than a repair. There is a seasonal version too. Water heaters that quit in cold weather, pressure regulators that fail after years of hard water, and hose bibs left open behind a closed shutoff all present as no water at the tap. Say what changed and when, because a service line replacement, a regulator swap and a water heater failure are three different trucks' worth of parts and San Jose requires a plumbing permit for the water service work.
Read this as background, not as a verdict on your house. The real fault gets identified by a plumber with hands on the pipe. Sorting out which of these four you are seeing simply keeps the correct machine from sitting back at the shop while you wait.
Checked against primary sources on 2026-08-21. Every claim below links to where it came from.
San Jose's median home was built in 1975, and roughly 144,000 of the city's 343,000 housing units went up between 1960 and 1979. The city's own housing element reports about 80% of the stock was built in 1960 or later, leaving about 20% pre-1960. The eras are geographic: Willow Glen bungalows date largely to the 1910s-1940s, Cambrian is mid-century 1950s-60s tract housing, Joseph Eichler's San Jose tracts were built between 1952 and 1963, and Almaden Valley and Evergreen filled in from the 1970s onward.
Why it matters: Build era is the fastest predictor of what is in the wall. Pre-1960 San Jose houses commonly still carry galvanized steel supply lines that fail as rusty pinholes at threaded joints, and cast iron drain and sewer lines that scale up internally and catch everything. The 1960s and 70s boom houses are typically copper, which pits and weeps at solder joints. That difference decides whether a leak is a section repair, a repipe, or a drain line that needs a camera after it is cabled.
Sources: point2homes.com · hcd.ca.gov · npgallery.nps.gov
San Jose Water publishes hardness by source: groundwater runs 11 to 26 grains per gallon, mountain surface water 5 to 12, and imported surface water 4 to 9. The utility's own threshold for calling water hard is 7 grains per gallon, or 120 parts per million.
Why it matters: Groundwater-served parts of San Jose are drinking water several times harder than the hard-water threshold. Dissolved calcium drops out as scale on the hottest surface it touches, which is the bottom of a water heater tank, and on every valve seat it passes. That is why tanks rumble and start leaking early here, why anode rods are consumed fast, and why angle stops and pressure regulators seize instead of turning.
Sources: sjwater.com · sjwater.com
San Jose requires a plumbing permit to install or replace a water heater, to do a repipe or water service project, and to repair or replace a building drain or building sewer or install a property line cleanout. Separately, the city's sanitary sewer FAQ states the property owner is responsible for maintaining the entire lateral, and that the city maintains the lower portion out to the main only as a courtesy, and only where an approved property-line wye cleanout exists within five feet of the property side of the sidewalk.
Why it matters: An emergency water heater swap or a sewer line repair in San Jose is a permitted, inspected job, not a quiet midnight replacement. Single-family and duplex permits are pulled online at SJPermits.org and a permit card lists the required inspections. The cleanout rule matters just as much during a backup: without an approved property-line cleanout the whole lateral is the homeowner's, and that fitting is also the access point a plumber needs to reach the line at all.
Sources: sanjoseca.gov · sanjoseca.gov · sanjoseca.gov · sanjoseca.gov
Yes. The city's own water heater page states plainly that installing or replacing a water heater requires a plumbing permit, and that an electrical permit may also be needed depending on the type. For a single-family house or duplex the permit is pulled online through SJPermits.org, and a permit card is issued listing the inspections. That is not optional paperwork you can skip because the tank failed on a Sunday. Venting, gas connections and seismic strapping are exactly what the inspection is checking, and this is earthquake country. A plumber can swap the tank now and carry the permit and inspection through afterward.
Because much of the city drinks very hard water. San Jose Water publishes hardness by source type: groundwater runs 11 to 26 grains per gallon, mountain surface water 5 to 12, and imported surface water 4 to 9, against its own threshold of 7 grains for water being called hard. Groundwater-served neighborhoods are getting water several times harder than that line. Dissolved calcium precipitates out as scale on the hottest surface it touches, which is the bottom of your water heater tank and the inside of every valve seat. That is why tanks rumble, why an anode rod is used up early, why angle stops seize, and why a heater that should last a decade starts leaking sooner here.
It depends on what is happening. Water actively escaping, sewage inside the building, or a whole house with no supply are dispatched as fast as a plumber can get across Santa Clara County, because all three get worse while you wait. A single slow drain, a dripping shutoff, or a running toilet is honestly better booked for daylight, when the work is done at a normal rate and a supply house is open if a part is needed. If your situation can wait until morning without costing you anything, you will be told that instead of being sold an after-hours visit you did not need.
Get the water stopped, get a real price before the pipe is opened, and get the repair done on the same visit. If water is still moving, close the main valve or the valve at the meter first, then call.
Call (408) 512-2397Upfront pricing · No obligation · Local Santa Clara County technician