San Francisco runs on surface (lake/reservoir) from San Francisco Public Utilities Commission (Hetch Hetchy) at 80 mg/L — moderately hard. San Francisco runs unusually soft at 80 mg/L thanks to Hetch Hetchy surface water. The real cost driver is the Victorian-era housing stock and the relentless marine fog, not mineral load.
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San Francisco Public Utilities Commission (Hetch Hetchy) delivers water to San Francisco from surface (lake/reservoir) at 80 mg/L (CaCO₃). That is moderately hard for a US municipal supply. On San Francisco glass that residency means minimal mineral residue when the wash dries clean. The operating practice is straightforward squeegee-and-scrim work; chemistry is rarely the binding constraint here.
Ranges reflect typical residential exterior pricing for San Francisco working operators. Story height, screen condition, frame material, and route density move the actual quote. Use the cost estimator below for a calibrated number against your specific home.
OPEN COST ESTIMATOR →Hetch Hetchy water delivers an unusually soft 80 mg/L baseline; cleaning is fast and rinses dry clean with no spotting on most glass.
Marine fog deposition is the real operating challenge — afternoon fog condensation on western-facing glass redeposits salts and re-streaks within hours of cleaning.
Victorian-era original glazing in Pacific Heights, Alamo Square, and Western Addition does not take a scraper; softer pressure and pure-water systems extend the life of historic glass.
The seasonal rhythm in San Francisco runs on the broader California pattern — water and weather behave at the state level even when the housing stock varies by city.
March through May is the coastal peak. The post-winter-rain pass drives the call volume in the Bay Area and northern California. LA runs steady through this season — the dry winters do not produce the same seasonal demand spike.
June through August is steady residential. The marine-layer cities run cool enough that flash-evaporation is not a working problem; the inland and Central Valley markets run morning-only shifts during the hottest weeks.
September through November is the wildfire-driven season. Post-smoke-event cleanings drive significant unscheduled volume in event years. Pre-holiday work begins in October.
December through February is the Bay Area rainy season and the LA dry season. Bay Area residential exterior work is reduced; LA residential exterior work is at peak. Many Bay Area operators run a winter LA route the way snowbird operators run a Florida route.
The Pacific coast from San Diego to Eureka sees salt aerosol year-round, heaviest during winter storm season. The Marin headlands, the San Francisco Sunset, the Big Sur coast, and the Malibu beach properties are the heaviest-deposition areas. Salt corrodes aluminum sash hardware over time.
The Bay Area summer fog produces sustained morning condensation on east-facing exposures that redeposits atmospheric particulate as a thin film. Standard cleaning protocols work; the consideration is the cleaning cadence — coastal SF and the Marin shoreline want more frequent service than inland equivalents.
San Francisco runs at 80 mg/L (CaCO₃) on San Francisco Public Utilities Commission (Hetch Hetchy) lake or reservoir surface water — moderately hard, meaning municipal water leaves minor mineral residue on dark glass over extended dry-down. Hardness can vary block-to-block on mixed supplies; use our ZIP-code hard-water tool for a finer-grained reading.
Residential window cleaning in San Francisco typically runs $13–19 per pane or $380–620 for a standard single-story exterior, depending on story height, screen condition, frame type, and route density. Our cost estimator calibrates a quote against your specific home.
In San Francisco and the surrounding California market, the working operator's calendar typically favors fall — september through november is the wildfire-driven season. post-smoke-event cleanings drive significant unscheduled volume in event years. pre-holiday work begins in october. The full seasonal breakdown is on the California state page.
In San Francisco the dominant residue patterns include coastal salt aerosol and marine layer fog and condensation. Cleaning intervals tied to the seasons these residue patterns peak will significantly extend how long each wash holds. The state page breaks down the local diagnostic in detail.
Single-story homes in San Francisco with accessible glazing can be cleaned by homeowners with basic squeegee technique. Multi-story houses, post-2010 coated glass, hard-water markets, and screen-and-track work usually pay for themselves with a professional. Our hiring checklist on the California page covers what to ask for.
Yes — San Francisco neighborhoods like Pacific Heights, Mission District, Marina each carry distinct housing-stock and glazing patterns. The neighborhoods section on this page calls out the operationally relevant differences, from heritage-glass handling in older corridors to coated-IGU stock in newer ones.
San Francisco has working window-cleaning operators serving the metro and the surrounding California. Use our Find a Cleaner page to be matched with vetted local pros, or read the city section above for the specific water and operating context an operator should know about San Francisco.
Window-cleaning conditions don't stop at the state line. These are the cities we cover in California's land-adjacent neighbors — different utility, often different water-source profile, sometimes the same micro-climate.
Editorial team contributor covering the Pacific Northwest and broader West Coast beat. Articles bylined by Easton are researched and reviewed in collaboration with the Giordano Inc. editorial team and informed by interviews with practicing window-washing operators in the region, plus published materials-science and trade references.