Public water system · CA4010830
ActiveCalifornia Mens Colony
At a glance
California Mens Colony (PWSID CA4010830) is an active community water system in San Luis Obispo County, California. It reports serving 15,000 people through 12 service connections. Its primary water source is surface water, and EPA lists it as owned by a state government. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in November 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
15,000
Service connections
12
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does California Mens Colony compare with other water systems in San Luis Obispo County?
By EPA's size categories, California Mens Colony is a large system (10,001 to 100,000 people). San Luis Obispo County has 171 active public water systems, and California Mens Colony is the 6th-largest of them by population served. Its population served is about 7.4 times the county average of 2,038 people per system, and accounts for 4.3% 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 California Mens Colony is about 124% above 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 California Mens Colony?
EPA lists California Mens Colony as owned by a state 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 171 active systems in San Luis Obispo County (3.5%) are also owned by a state government.
Does California Mens Colony have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in November 2022. The violations listed here began between January 2004 and November 2022. By type: 2 monitoring and reporting and 1 required treatment not met. The contaminants or rules involved are Surface Water Treatment Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule and Total trihalomethanes (TTHM). EPA lists 3 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 |
|---|---|---|---|---|
| 2022-11-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2012-08-03 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Resolved |
| 2004-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
All 3 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.
California Mens Colony: frequently asked questions
Who runs California Mens Colony?
California Mens Colony (PWSID CA4010830) is a community water system owned by a state government. It is regulated by the CA state drinking water program.
How many people does California Mens Colony serve?
California Mens Colony reports serving 15,000 people through 12 service connections in San Luis Obispo County, California.
Where does California Mens Colony 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 California Mens Colony have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in November 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 California Mens Colony'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 3 violations for this system; 1 is health-based, and the most recent began in November 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find California Mens Colony's water quality report?
As a community water system, California Mens Colony 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 |
| Nipomo Comm Services Dist | San Luis Obispo | 13,771 | 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, “California Mens Colony, PWSID CA4010830, California”, https://aquacensus.com/water-systems/california/california-mens-colony-ca4010830 (data as of October 1, 2026).