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Low Water Pressure in San Francisco, CA

Old metal supply pipes running across a basement ceiling
PressureTrace is a referral service, not a plumbing contractor. We connect homeowners with independent contractors. Contractors are required to hold whatever credential their state or municipality demands. Every state page sets out who licenses plumbers there and where to check, so you can confirm before work begins. We do not perform plumbing work, we do not set prices, and we never charge homeowners anything — the contractors in our network pay us when we route them a call.

San Francisco has 361,770 occupied homes across 26 ZIP codes, and the typical one was built in 1943. That year is the most useful single fact for working out why the water pressure is weak, because it predicts what the supply pipe is made of.

San Francisco sits 28 years older than the CA median of 1971. Of the 257 CA towns we route calls in, its housing is older than 99% of them, and by number of homes it ranks 2nd.

What 1943 tells you about the pipe in San Francisco

Housing of this vintage generally means galvanized steel as standard, and at this age the inside diameter of a half-inch line can be materially narrower than it was when it was fitted. The classic sign is that pressure is worst at the fixtures furthest from where the water comes in. More on 1940s supply pipe.

39% of occupied homes in San Francisco are owner-occupied, 24 points below the CA figure of 63%. It matters here because the run between the meter and the house belongs to the property owner, not the utility.

Median household income across San Francisco ZIP codes is $152,403, 46% above the CA median of $104,737.

Before calling anyone in San Francisco, check whether every tap is weak or just one. Normal supply is 45–80 psi and under 40 psi is low — how to test it in a minute. Whole house is a supply problem worth a call; one tap is usually a five-minute job you can do yourself.

Build year and occupied homes by ZIP code in San Francisco

ZIPTypical build yearOccupied homes
94102194119,543
94103199217,352
9410520088,316
94107199815,761
9410819386,326
94109193831,899
94110193826,984
9411119782,471
94112194023,274
94114193816,804
94115194916,725
94116194415,355
94117193817,558
94118193816,995
94121193818,175
94122194322,375
94123193812,510
94124196610,982
9412719387,466
9412919511,338
94131196212,469
94132195110,686
94133193812,954
94134195312,545
9415820094,907

Nearby towns we cover

Worth reading for a 1943-era home

ZIP codes we route in San Francisco

Low water pressure help near me in San Francisco

Give us your San Francisco ZIP code and what is happening. We check it against partner coverage and connect you with an independent contractor covering that area. We do not do the work and you are never charged.

Call (866) 838-2750

Call (866) 838-2750