Public water system · CA3810005
ActiveHhw&P-O'Shaughnessy Dam Cpd-Sfpuc
At a glance
Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc (PWSID CA3810005) is an active transient non-community water system in San Francisco County, California. It reports serving 495 people through 8 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; 4 are health-based, and the most recent began in August 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
495
Service connections
8
Primary source
SW
Surface water
System type
TNCWS
Transient non-community water system
System record
How does Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc compare with other water systems in San Francisco County?
By EPA's size categories, Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc is a very small system (500 people or fewer). San Francisco County has 8 active public water systems, and Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc is the 6th-largest of them by population served. Its population served is well below the county average of 130,038 people per system, and accounts for less than 0.1% 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 transient non-community water system reports serving 144 people, so Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc is about 3.4 times that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. California has 3,016 active transient non-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 Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc?
EPA lists Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc 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 Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc have drinking water violations?
EPA's records list 5 violations for this system; 4 are health-based, and the most recent began in August 2022. The violations listed here began between November 1993 and August 2022. By type: 2 required treatment not met, 2 contaminant level above the legal limit 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 |
|---|---|---|---|---|
| 2022-08-01 | Required treatment not metFailure to Filter (SWTR) · code 42 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 1996-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1995-07-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
| 1995-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | 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 |
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.
Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc: frequently asked questions
Who runs Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc?
Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc (PWSID CA3810005) is a transient non-community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc serve?
Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc reports serving 495 people through 8 service connections in San Francisco County, California.
Where does Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc 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 Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc have any drinking water violations?
EPA's records list 5 violations for this system; 4 are health-based, and the most recent began in August 2022. 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 Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc'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 August 2022. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc is a 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 |
| 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 |
| Presidio of San Francisco | San Francisco | 3,500 | Community | Surface water |
| San Francisco Regional Water System | San Francisco | 600 | 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, “Hhw&P-O'Shaughnessy Dam Cpd-Sfpuc, PWSID CA3810005, California”, https://aquacensus.com/water-systems/california/hhw-p-o-shaughnessy-dam-cpd-sfpuc-ca3810005 (data as of October 1, 2026).