Public water system · CA3810010
ActiveSan Francisco International Airport
At a glance
San Francisco International Airport (PWSID CA3810010) is an active non-transient non-community water system in San Francisco County, California. It reports serving 183,386 people through 441 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; all are health-based, and the most recent began in December 1995.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
183,386
Service connections
441
Primary source
SWP
Purchased surface water
System type
NTNCWS
Non-transient non-community water system
System record
How does San Francisco International Airport compare with other water systems in San Francisco County?
By EPA's size categories, San Francisco International Airport is a very large system (more than 100,000 people). San Francisco County has 8 active public water systems, and San Francisco International Airport is the 2nd-largest of them by population served. Its population served is about 41% above the county average of 130,038 people per system, and accounts for 18% of the 1,040,304 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so San Francisco International Airport is about 427 times that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. California has 1,466 active non-transient non-community water systems, 20% of the state's 7,479 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates San Francisco International Airport?
EPA lists San Francisco International Airport as owned by a local government. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 6 of the 8 active systems in San Francisco County (75%) are also owned by a local government.
Does San Francisco International Airport have drinking water violations?
EPA's records list 5 violations for this system; all are health-based, and the most recent began in December 1995. The violations listed here began between September 1993 and December 1995. By type: 5 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 5 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1995-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 5 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
San Francisco International Airport: frequently asked questions
Who runs San Francisco International Airport?
San Francisco International Airport (PWSID CA3810010) is a non-transient non-community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does San Francisco International Airport serve?
San Francisco International Airport reports serving 183,386 people through 441 service connections in San Francisco County, California.
Where does San Francisco International Airport get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does San Francisco International Airport have any drinking water violations?
EPA's records list 5 violations for this system; all are health-based, and the most recent began in December 1995. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is San Francisco International Airport's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 5 violations for this system; all are health-based, and the most recent began in December 1995. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find San Francisco International Airport's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. San Francisco International Airport is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in San Francisco County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Sfpuc City Distribution Division | San Francisco | 848,019 | Community | Purchased surface water |
| Treasure Island | San Francisco | 3,864 | Community | Purchased surface water |
| Presidio of San Francisco | San Francisco | 3,500 | Community | Surface water |
| San Francisco Regional Water System | San Francisco | 600 | Community | Surface water |
| Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc | San Francisco | 495 | Transient non-community | Surface water |
| Hhw&P Moccasin Compound-Sfpuc | San Francisco | 410 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “San Francisco International Airport, PWSID CA3810010, California”, https://aquacensus.com/water-systems/california/san-francisco-international-airport-ca3810010 (data as of October 1, 2026).