San Francisco, CA tap water: what’s in it in 2026
Reviewed by Joe Letorney, 30-year water treatment expert · Former WQA Certified Water Treatment Specialist (CWS), Level VI
See best water filters for lead removal and what filters remove PFAS.
Serving 870K residents via SF Public Public water systems Commission · San Francisco, CA drinking water is supplied by SF Public Public water systems Commission. EPA and public water system monitoring commonly focus on issues such as Chloramine disinfection byproducts, PFAS in some sources, Lead in building plumbing. Across the distribution grid, transmission mains, booster stations, and seasonal source shifts can change disinfectant residuals and disinfection byproduct levels before water reaches older service lines. Cross-check this system picture with your ZIP-level SDWIS and UCMR view so you see the latest detections and violations tied to your address.
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WaterCheckup Safety Score — an independent index from EPA public data and our formula. Not your utility’s official water quality rating, an EPA compliance grade, or a test of water at your tap. How we score →
San Francisco water currently shows no major violations in EPA monitoring data. That said, your home's internal plumbing can add lead or other contaminants after water leaves the treatment plant — especially in homes built before 1986.
San Franciscowater may meet federal EPA limits while still showing contaminants above independent health guidelines (EWG, state advisories). EPA MCLs are often set on treatment feasibility — not a "zero risk" threshold. Compare levels below to health guidelines and state/U.S. utility averages, then see which filter technologies address your profile.
EPA UCMR5 PFAS plus utility/EWG averages from our contaminant bundle. Run a ZIP report for live SDWIS samples at your address.
EWG health guideline: 0.06 ppb (HAA5)
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 21.57 ppb · CA utility avg: 35.03 ppb
Removes with: RO · Carbon
Can impair thyroid function — most concerning during pregnancy and childhood.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 23.64 ppb · CA utility avg: 15.58 ppb
Removes with: RO · Carbon
EWG health guideline: 0.15 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 30.97 ppb · CA utility avg: 26.50 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 17.82 ppb · CA utility avg: 12.20 ppb
Removes with: RO · Carbon
EWG health guideline: 0.2 ppb
Disinfection byproduct linked to bladder cancer and possible reproductive effects.
Removes with: RO · Carbon
EWG health guideline: 0.4 ppb
Disinfection byproduct linked to bladder cancer and developmental effects at high exposure.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 59.68 ppb · CA utility avg: 96.97 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 39.95 ppb · CA utility avg: 52.18 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.89 ppm · CA utility avg: 1.24 ppm
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 1.47 ppb · CA utility avg: 3.03 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.87 ppm · CA utility avg: 0.98 ppm
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 37.44 ppb · CA utility avg: 27.74 ppb
Removes with: RO · Carbon
EWG health guideline: 0.06 ppb
THM component linked to cancer and reproductive harm with long-term exposure.
Removes with: RO · Carbon
EWG health guideline: 100 ppb
Long-term exposure at high levels may affect the nervous system. Staining and taste issues at lower levels.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.60 ppb · CA utility avg: 1.11 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.49 ppm · CA utility avg: 0.35 ppm
Removes with: RO · Ion exchange
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.72 ppb · CA utility avg: 0.32 ppb
Removes with: RO · Carbon
U.S. and state averages from EWG Tap Water Atlas utilities in our database. For your exact tap, use a ZIP report — home plumbing can differ from utility averages.
SF water comes from Hetch Hetchy Reservoir in Yosemite -- one of the cleanest sources in the country.
SF uses chloramine which creates NDMA and other DBPs that are harder to filter.
PFAS has been detected in some SFPUC water sources above California health goals.
Older SF buildings (pre-1986) have lead solder and some lead service lines still active.
The EPA's 5th Unregulated Contaminant Monitoring Rule (UCMR5) required systems serving 3,300+ people to test for 29 PFAS compounds between 2023–2025. This system either was not required to test, reported no detections, or has not yet submitted results to the federal database.
Source: EPA UCMR5 national dataset · Data current as of 2026
Reference matrix — not specific brands. NSF-certified carbon blocks, reverse osmosis (NSF 58), and ion-exchange softeners address different contaminants. Product picks below match this profile.
San Franciscoutility data is a strong baseline — but lead often comes from your home's pipes, and PFAS can vary by neighborhood. Choose certified lab testing for certainty, or skip straight to NSF-certified filters matched to this profile.
SimpleLab Tap Score mail-in panels test PFAS, lead, nitrates, bacteria, and 100+ contaminants at your kitchen tap. Results in about a week — then pick filtration with real numbers, not guesses.
Tap Score City Test — from $89 →Accredited labs · Best if you have old plumbing, pregnancy, or want proof before installing RO
Get NSF 58 / NSF 53 picks matched to San Francisco's PFAS, lead, and disinfection byproduct profile — reviewed by a 30-year water treatment expert.
Take the 3-question filter quiz →Best when contaminants are already flagged above and you want the right RO or pitcher today
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Matched to what's actually in your water
COMMON QUESTIONS
Is San Francisco tap water safe to drink in 2026?
San Francisco water meets EPA legal standards, but meeting legal standards is not the same as being free of health concerns. EPA limits are set based on treatment feasibility, not always on what independent scientists consider safe. The main concerns for San Francisco residents are chloramine disinfection byproducts and pfas in some sources. Enter your ZIP above to see the full violation history for your specific water system.
Does San Francisco water have PFAS?
EPA UCMR5 monitoring data for San Francisco (water system CA3700963) is shown above. PFAS — sometimes called "forever chemicals" — are synthetic compounds that don't break down in the body. Only reverse osmosis systems or NSF 58-certified carbon block filters reliably remove PFAS from tap water. Standard pitcher filters do not remove PFAS.
Does San Francisco water have lead?
Lead in tap water almost always comes from the pipes inside your home or building, not the treatment plant. Homes built before 1986 in San Francisco are most at risk because they may have lead solder, brass fittings, or lead service lines. The EPA has no safe level for lead in children. An NSF/ANSI 53-certified filter or reverse osmosis system removes lead at the tap.
What water filter is best for San Francisco?
For San Francisco's water profile — chloramine disinfection byproducts, pfas in some sources — a reverse osmosis system addresses the widest range of contaminants. Under-sink RO (Waterdrop G3P600, Aquasana SmartFlow) is the gold standard for homeowners. Renters can use a countertop RO like the Waterdrop K19-S Countertop RO — zero installation required. Clearly Filtered pitchers are the best non-RO option for PFAS and lead.
How do I get my San Francisco water tested?
For the most accurate results for your specific tap, use a certified mail-in lab test rather than relying on city-wide data. SimpleLab Tap Score tests for 100+ contaminants including PFAS, lead, arsenic, and nitrates. Results come with a detailed health assessment and filter recommendations. City-wide EPA data like what you see above is a strong baseline, but your home's plumbing can add contaminants after the water leaves the treatment plant.
As of October 2024, all US public water systems must publish a public inventory of their lead service lines — the pipes connecting the water main to your home. Even if your public water system water tests clean at the treatment plant, lead can leach from these pipes into your tap. Homes built before 1986 are most at risk.
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City-wide data is just the start. Enter your ZIP to see your exact water system's EPA report, PFAS levels, and violation history — then get the right filter for your home.
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Reviewed by Joe Letorney, 30-year water treatment expert · Former WQA Certified Water Treatment Specialist (CWS), Level VI