Public water system · CA4010015
ActiveMorro Rock Mutual Water Co
At a glance
Morro Rock Mutual Water Co (PWSID CA4010015) is an active community water system in San Luis Obispo County, California. It reports serving 2,181 people through 661 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list one violation for this system; it is health-based, and the most recent began in July 1993.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,181
Service connections
661
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Morro Rock Mutual Water Co compare with other water systems in San Luis Obispo County?
By EPA's size categories, Morro Rock Mutual Water Co is a small system (501 to 3,300 people). San Luis Obispo County has 171 active public water systems. Its population served is roughly in line with the county average of 2,038 people per system, and accounts for 0.6% 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 Morro Rock Mutual Water Co 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 Morro Rock Mutual Water Co?
EPA lists Morro Rock Mutual Water Co 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. 130 of the 171 active systems in San Luis Obispo County (76%) are also privately owned.
Does Morro Rock Mutual Water Co have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in July 1993. By type: 1 required treatment not met. The contaminant or rule involved is Surface Water Treatment Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 1993-07-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
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.
Morro Rock Mutual Water Co: frequently asked questions
Who runs Morro Rock Mutual Water Co?
Morro Rock Mutual Water Co (PWSID CA4010015) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Morro Rock Mutual Water Co serve?
Morro Rock Mutual Water Co reports serving 2,181 people through 661 service connections in San Luis Obispo County, California.
Where does Morro Rock Mutual Water Co 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 Morro Rock Mutual Water Co have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in July 1993. 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 Morro Rock Mutual Water Co'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 health-based, and the most recent began in July 1993. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Morro Rock Mutual Water Co's water quality report?
As a community water system, Morro Rock Mutual Water Co 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, “Morro Rock Mutual Water Co, PWSID CA4010015, California”, https://aquacensus.com/water-systems/california/morro-rock-mutual-water-co-ca4010015 (data as of October 1, 2026).