ZIP 94128
Water quality in San Francisco, CA (94128)
Drinking water in ZIP 94128 (San Francisco, San Mateo County) comes from 36 public water system s on EPA's records. The list below is ranked by population served: the largest regional authority for your area appears first, smaller subdivisions and private systems below.
Combined population served: 779,366 people.
Public water systems serving ZIP 94128
Ranked by population served. Tier badges show how EPA records each utility's service area: "Serves your city" means EPA's geographic-areas table specifically lists San Francisco; "Serves your county" means the utility serves San Mateo County (regional authorities are usually filed this way); "Billing address at this ZIP" means the utility files paperwork from this ZIP but EPA does not confirm it serves you.
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More for CA
How we matched ZIP 94128: we translate the ZIP to a city and county via the Geonames postal database, then match against service-area cities and counties EPA has on file for each public water system. EPA does not publish authoritative service-area boundary maps for most systems, so there is still some guesswork; large regional authorities (e.g., county-wide water and sewer authorities) are usually filed at the county level even when they serve specific cities. Your water bill names the authoritative utility. Methodology.