Public water system · CA3810700
ActivePresidio of San Francisco
At a glance
Presidio of San Francisco (PWSID CA3810700) is an active community water system in San Francisco County, California. It reports serving 3,500 people through 1,228 service connections. Its primary water source is surface water, and EPA lists it as owned by the federal government. EPA's records list 5 violations for this system; 4 are health-based, and the most recent began in December 2002.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,500
Service connections
1,228
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Presidio of San Francisco compare with other water systems in San Francisco County?
By EPA's size categories, Presidio of San Francisco is a medium system (3,301 to 10,000 people). San Francisco County has 8 active public water systems, and Presidio of San Francisco is the 4th-largest of them by population served. Its population served is well below the county average of 130,038 people per system, and accounts for 0.3% 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 community water system reports serving 6,703 people, so Presidio of San Francisco is about half of that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. California has 2,997 active community water systems, 40% of the state's 7,479 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates Presidio of San Francisco?
EPA lists Presidio of San Francisco as owned by the federal 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. 2 of the 8 active systems in San Francisco County (25%) are also owned by the federal government.
Does Presidio of San Francisco have drinking water violations?
EPA's records list 5 violations for this system; 4 are health-based, and the most recent began in December 2002. The violations listed here began between June 1993 and December 2002. By type: 2 contaminant level above the legal limit, 2 required treatment not met and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 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 |
|---|---|---|---|---|
| 2002-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-08-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1993-08-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | 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.
Presidio of San Francisco: frequently asked questions
Who runs Presidio of San Francisco?
Presidio of San Francisco (PWSID CA3810700) is a community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Presidio of San Francisco serve?
Presidio of San Francisco reports serving 3,500 people through 1,228 service connections in San Francisco County, California.
Where does Presidio of San Francisco get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Presidio of San Francisco have any drinking water violations?
EPA's records list 5 violations for this system; 4 are health-based, and the most recent began in December 2002. 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 Presidio of San Francisco'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; 4 are health-based, and the most recent began in December 2002. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Presidio of San Francisco's water quality report?
As a community water system, Presidio of San Francisco must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
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 |
| San Francisco International Airport | San Francisco | 183,386 | Non-transient non-community | Purchased surface water |
| Treasure Island | San Francisco | 3,864 | Community | Purchased 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, “Presidio of San Francisco, PWSID CA3810700, California”, https://aquacensus.com/water-systems/california/presidio-of-san-francisco-ca3810700 (data as of October 1, 2026).