Public water system · CA3705073
ActiveSan Ysidro Health - Mhfm
At a glance
San Ysidro Health - Mhfm (PWSID CA3705073) is an active non-transient non-community water system in San Diego County, California. It reports serving 30 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in February 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does San Ysidro Health - Mhfm compare with other water systems in San Diego County?
By EPA's size categories, San Ysidro Health - Mhfm is a very small system (500 people or fewer). San Diego County has 191 active public water systems. Its population served is well below the county average of 19,427 people per system, and accounts for less than 0.1% of the 3,710,459 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 Ysidro Health - Mhfm is well below 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates San Ysidro Health - Mhfm?
EPA lists San Ysidro Health - Mhfm as privately owned. 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. 101 of the 191 active systems in San Diego County (53%) are also privately owned.
Does San Ysidro Health - Mhfm have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in February 2024. By type: 1 monitoring. The contaminant or rule involved is Revised Total Coliform Rule. EPA lists 1 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
The one violation in EPA's records.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 Ysidro Health - Mhfm: frequently asked questions
Who runs San Ysidro Health - Mhfm?
San Ysidro Health - Mhfm (PWSID CA3705073) is a non-transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does San Ysidro Health - Mhfm serve?
San Ysidro Health - Mhfm reports serving 30 people through 1 service connection in San Diego County, California.
Where does San Ysidro Health - Mhfm get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does San Ysidro Health - Mhfm have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in February 2024. 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 Ysidro Health - Mhfm'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 one violation for this system; it is not health-based, and the most recent began in February 2024. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find San Ysidro Health - Mhfm's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. San Ysidro Health - Mhfm 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 Diego County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| San Diego, City of | San Diego | 1,385,379 | Community | Surface water |
| Helix Water District | San Diego | 277,668 | Community | Surface water |
| Otay Water District | San Diego | 238,008 | Community | Purchased surface water |
| Sweetwater Authority | San Diego | 191,282 | Community | Surface water |
| Oceanside, City of | San Diego | 171,483 | Community | Purchased surface water |
| Escondido, City of | San Diego | 137,044 | Community | 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 Ysidro Health - Mhfm, PWSID CA3705073, California”, https://aquacensus.com/water-systems/california/san-ysidro-health-mhfm-ca3705073 (data as of October 1, 2026).