Public water system · CA2701184
ActiveSan Antonio Lake Park South Ws
At a glance
San Antonio Lake Park South Ws (PWSID CA2701184) is an active transient non-community water system in Monterey County, California. It reports serving 653 people through 307 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
653
Service connections
307
Primary source
SW
Surface water
System type
TNCWS
Transient non-community water system
System record
How does San Antonio Lake Park South Ws compare with other water systems in Monterey County?
By EPA's size categories, San Antonio Lake Park South Ws is a small system (501 to 3,300 people). Monterey County has 307 active public water systems. Its population served is about 58% below the county average of 1,552 people per system, and accounts for 0.1% of the 476,419 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 San Antonio Lake Park South Ws is about 4.5 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 San Antonio Lake Park South Ws?
EPA lists San Antonio Lake Park South Ws 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. 28 of the 307 active systems in Monterey County (9.1%) are also owned by a local government.
Does San Antonio Lake Park South Ws have drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in November 2025. The violations listed here began between November 2023 and November 2025. By type: 6 required treatment not met and 6 monitoring and reporting. The contaminant or rule involved most often is Surface Water Treatment Rule (12 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2025-11-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2025-11-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2025-10-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2025-09-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2025-09-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2025-08-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2025-08-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2023-12-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
| 2023-12-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2023-11-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Archived |
| 2023-11-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
The 12 most recent 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 Antonio Lake Park South Ws: frequently asked questions
Who runs San Antonio Lake Park South Ws?
San Antonio Lake Park South Ws (PWSID CA2701184) 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 San Antonio Lake Park South Ws serve?
San Antonio Lake Park South Ws reports serving 653 people through 307 service connections in Monterey County, California.
Where does San Antonio Lake Park South Ws 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 San Antonio Lake Park South Ws have any drinking water violations?
Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in November 2025. 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 Antonio Lake Park South Ws' 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. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in November 2025. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find San Antonio Lake Park South Ws' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. San Antonio Lake Park South Ws 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 Monterey County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cwsc Salinas | Monterey | 123,679 | Community | Groundwater |
| Cal Am Water Company - Monterey | Monterey | 92,450 | Community | Groundwater under influence of surface water |
| Alco Water Service | Monterey | 56,253 | Community | Groundwater |
| Marina Coast Water District | Monterey | 38,377 | Community | Groundwater |
| Soledad, City of | Monterey | 19,455 | Community | Groundwater |
| Greenfield, City of | Monterey | 18,967 | Community | Groundwater |
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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 Antonio Lake Park South Ws, PWSID CA2701184, California”, https://aquacensus.com/water-systems/california/san-antonio-lake-park-south-ws-ca2701184 (data as of October 1, 2026).