Mountain View homes and the plumbing under them
Mountain View is not one housing era. Monta Loma, bounded by San Antonio Road, Middlefield Road, Rengstorff Avenue and Central Expressway, grew from three developments, Eichler's Fairview, Mackay's Oakwood and Mardell Manor. The City's historic context statement dates the Fairview Eichlers to roughly 1954 to 1957.
Many mid-century homes like these sit on slabs, and Eichler homes often hide radiant heating pipe in the floor, so a warm patch or a climbing water bill points toward slab leak repair before anything else.
Blossom Valley is a set of 1950s and 1960s ranch-style subdivisions built on former orchard land, with the Gest Ranch and Miramonte Oaks pocket along the Los Altos side. Homes that age usually have decades-old supply piping and clay or cast iron sewer laterals, which is why root-clogged drains and low pressure are common service calls there. A drain that keeps returning is often a sewer camera inspection question, not a clog question.
Cuernavaca, off Crestview Drive near the Sunnyvale line, sits on a former cherry orchard, and downtown around Castro Street mixes older single-family streets with newer apartments and mixed-use buildings. Newer buildings change the call: shared risers, tight utility closets and tankless water heaters show up more than galvanized pipe.
Water, sewer and permits in Mountain View
Public water reports that describe the City's supply put about 89 percent of it from the San Francisco Public Utilities Commission, with Valley Water and a small share of local groundwater making up the rest. The City's water quality page also states that its 2024 inventory found no lead service lines. That says nothing about the fixtures and solder inside an older house, which is a separate question.
Wastewater leaves the city through a shared system. The Palo Alto Regional Water Quality Control Plant treats sewage for Mountain View, Los Altos, Los Altos Hills, Palo Alto, Stanford and the East Palo Alto Sanitary District. If a backup is in the street main rather than your lateral, the City's Public Works wastewater section is the right call alongside ours.
The Building Division at 500 Castro Street says a permit is required for every water heater installation and replacement, and that it must be obtained before work starts. The same guide asks for two seismic straps, one in the top third of the tank and one in the bottom third. We build that into water heater replacement jobs rather than treating it as an extra.
Which service matches the problem| What you notice | Most likely service | Urgency |
|---|
| Water spraying or pooling from a pipe | Burst pipe repair | Emergency, shut off the main first |
| Sewage or gray water rising in a tub or floor drain | Sewer line cleaning | Emergency, stop using water |
| Tank leaking from the body, or no hot water at all | Water heater repair | Urgent, same day when available |
| Meter keeps moving with everything off | Leak detection | Urgent, often hidden damage |
| Slow drain that returns within weeks | Drain cleaning | Planned unless backing up |
| Old tank, rust-colored hot water | Water heater installation | Planned, but do not wait for a leak |
ZIP codes and towns we dispatch to
Mountain View's street-delivery ZIP codes are 94040, 94041 and 94043. The codes 94035, 94039 and 94042 are post-office-box ZIPs, and 94035 is also tied to Moffett Field, so you will rarely see them on a house.
Emergency drain cleaning, water heater replacement and leak detection are dispatched to addresses in 94040, 94041 and 94043, and to a Mountain View job address that mails to any of the other three. Next door we also dispatch to Los Altos, and the wider service area reaches Sunnyvale, Palo Alto and Cupertino.
Whatever ZIP your mail uses, the question that matters is the street address of the problem. Call (650) 860-1670 with the address and we will confirm the dispatch window before anyone drives out.
Plumbing in California follows the California Plumbing Code, Part 5 of Title 24, published by IAPMO, and the City of Mountain View's Building Division enforces it for permitted work.
Emergency plumber questions in Mountain View
Do you handle plumbing emergencies at night or on weekends in Mountain View?
Yes. The emergency line is answered 24/7, including nights, weekends and holidays. Call (650) 860-1670, describe what is happening, and a licensed plumber is dispatched to your address.
How fast can a plumber reach me?
It depends on traffic on El Camino Real, US-101 and Central Expressway and on who is closest when you call. We tell you the dispatch window on the phone and do not promise an exact arrival time we cannot control.
What should I do before the plumber arrives?
Shut off the main water valve, turn off the water heater if it is leaking, keep everyone away from wet outlets and appliances, and move valuables out of the wet area. For a sewer backup, stop running water in the house. Photograph the damage for your insurer before cleanup.
Will I know the price before work starts?
Yes. The plumber diagnoses first and gives a clear price before work starts. If the scope changes mid-job, you hear about it before more work is done.
Do you replace water heaters, and do you pull the permit?
We replace tank and tankless water heaters. The City of Mountain View requires a permit for every water heater installation and replacement, and the work includes seismic strapping. We handle that as part of the job.
Do you serve Los Altos, Sunnyvale and Palo Alto too?
Yes. Los Altos has its own page because its water provider, sewer rules and housing mix differ from Mountain View. Sunnyvale, Palo Alto and Cupertino are served from the same dispatch line.
Are you licensed and insured?
The plumbers we dispatch are licensed and insured. California residents can check any contractor's license on the Contractors State License Board website before work begins, and you should.
Call (650) 860-1670
