Plumber in San Jose, CA

5-Star has been doing plumbing in Northern California since 2018, and San Jose runs on its own crews and its own schedule. Your job gets booked against South Bay work. What came south with us is the part that takes years to build: technicians who have spent that time under old houses and who can tell you in the first hour what the rest of the job looks like.

On a San Jose call we ask two things before anything else. Which company sends your water bill, and whether there is a cleanout at your property line. Both answers shape the job before we arrive, and one of them decides who pays for part of it.

Three Water Companies, and All of Them Deliver Hard Water

Three retailers serve this city. San Jose Water covers most of it. Great Oaks Water Company serves much of the south side. The City of San Jose runs its own Municipal Water System in North San Jose, Alviso, Evergreen, and the far south end. The city publishes a lookup tool if you are not sure which one is yours.

Which one you have changes the number, not the verdict. San Jose Water publishes hardness by source: 11 to 26 grains per gallon from valley groundwater, 5 to 12 grains from mountain surface water, and 4 to 9 grains from the imported supply. Anything above 7 counts as hard. Most of this city is drinking water at the top of that range or past it.

That is the main reason water heaters here rarely reach the age printed on the warranty. Mineral settles into the bottom of a tank and coats the heat exchanger inside a tankless unit. It shows up on the shower glass years before it shows up as a failure, and by the time a heater is rumbling, the layer has been building for a long time.

The Cleanout at Your Property Line Decides Who Pays

Your sewer lateral runs from the house out to the city main, and in San Jose the property owner is responsible for the whole thing. There is one exception worth knowing. If an approved wye cleanout is installed at the property line, the city will clear the lower section, from that cleanout out to the main, as a courtesy.

No cleanout, no courtesy. The entire run is yours, including the part under the sidewalk.

The city sets the details. The cleanout goes on your side of the line, within five feet of it, in an approved concrete box that opens. Installing one takes a plumbing permit, and the city requires one anyway whenever the building sewer is replaced or repaired at the property line. If you are already paying for lateral work, that is the moment to get it in.

The Ground Moves Here, and Buried Pipe Moves With It

Much of the valley floor sits on expansive clay. It swells through a wet winter and shrinks through a dry summer, and it does that every year. Concrete does not argue with it, and neither does a sixty-year-old sewer lateral.

What that does to a buried line is slow and specific. Joints pull apart. Sections sag into low spots that hold water and debris. Upstairs the house shows nothing at all until a drain that behaved for years starts backing up twice a winter.

This is why a camera goes down the line before we quote a repair. Clay tile and cast iron laterals are still common in the older parts of the city, and the difference between a spot repair and a full replacement is usually a few feet of pipe that only the camera can find.

Your Pipes by Neighborhood Age

The pre-war core, downtown and around it (95110, 95112, 95113).
The oldest housing in the city, sitting on the oldest sewer. Vitrified clay laterals and galvanized supply lines both turn up here, and both are past their service life.

The 1920s to 1950s streets on the west side (95125, 95126, 95128).
Bungalows and early tract housing under mature street trees, on laterals that were never built to share ground with a root system that size.

The slab tracts of the 1950s and 1960s (95123, 95124, 95129, 95130).
Slab on grade, copper supply run under the concrete, cast iron drains. This is slab leak territory, and a few of these tracts have systems buried in the floor that nobody should be cutting into blind.

The newer east and north side (95121, 95131, 95132, 95134, 95138, 95148). .
Copper or PEX supply and plastic drains. The pipe is young. What brings us out is the water heater, the pressure regulator, and the expansion tank nobody has looked at since the house was built.

San Jose spreads across close to thirty ZIP codes, and we work the whole city, from the pre-war streets downtown to the newest construction on the north and east sides.

Downtown and central (95110, 95112, 95113, 95126):
Downtown, Japantown, Naglee Park, College Park, the Rose Garden, Shasta Hanchett Park, Midtown

West and southwest (95117, 95118, 95124, 95125, 95128, 95129, 95130):
Willow Glen, Cambrian Park, Burbank, Winchester, West San Jose, Westgate

South (95111, 95119, 95120, 95123, 95136, 95138, 95139):
Blossom Valley, Almaden Valley, Santa Teresa, Edenvale, Seven Trees, Communications Hill, Silver Creek Valley

East (95116, 95121, 95122, 95127, 95135, 95148):
Alum Rock, East Foothills, Evergreen, Mount Pleasant, Brookwood Terrace

North (95002, 95131, 95132, 95133, 95134):
Berryessa, North San Jose, Alviso, the Oakland Road corridor

Nearby, we also serve Sunnyvale, Mountain View, and Los Gatos.