Public water system · CA4010901
ActiveSlocsa #10a - Cayucos
At a glance
Slocsa #10a - Cayucos (PWSID CA4010901) is an active community water system in San Luis Obispo County, California. It reports serving 1,200 people through 784 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,200
Service connections
784
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Slocsa #10a - Cayucos compare with other water systems in San Luis Obispo County?
By EPA's size categories, Slocsa #10a - Cayucos is a small system (501 to 3,300 people). San Luis Obispo County has 171 active public water systems. Its population served is about 41% below the county average of 2,038 people per system, and accounts for 0.3% of the 348,510 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 Slocsa #10a - Cayucos is well below 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. 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 Slocsa #10a - Cayucos?
EPA lists Slocsa #10a - Cayucos 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. 33 of the 171 active systems in San Luis Obispo County (19%) are also owned by a local government.
Does Slocsa #10a - Cayucos have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Slocsa #10a - Cayucos. For the latest compliance status, check EPA ECHO for current compliance history.
Slocsa #10a - Cayucos: frequently asked questions
Who runs Slocsa #10a - Cayucos?
Slocsa #10a - Cayucos (PWSID CA4010901) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Slocsa #10a - Cayucos serve?
Slocsa #10a - Cayucos reports serving 1,200 people through 784 service connections in San Luis Obispo County, California.
Where does Slocsa #10a - Cayucos 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 Slocsa #10a - Cayucos have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Slocsa #10a - Cayucos' 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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Slocsa #10a - Cayucos' water quality report?
As a community water system, Slocsa #10a - Cayucos 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 Luis Obispo County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Santa Margarita Recreation Area | San Luis Obispo | 50,001 | Transient non-community | Groundwater |
| San Luis Obispo Water Department | San Luis Obispo | 47,788 | Community | Surface water |
| City of Paso Robles Water Division | San Luis Obispo | 31,176 | Community | Surface water |
| Atascadero Mutual Water Co | San Luis Obispo | 30,618 | Community | Groundwater |
| City of Arroyo Grande Utilities Division | San Luis Obispo | 17,963 | Community | Purchased surface water |
| California Mens Colony | San Luis Obispo | 15,000 | 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, “Slocsa #10a - Cayucos, PWSID CA4010901, California”, https://aquacensus.com/water-systems/california/slocsa-10a-cayucos-ca4010901 (data as of October 1, 2026).