Public water system · CA5403047
ActiveCasillas Water System
At a glance
Casillas Water System (PWSID CA5403047) is an active transient non-community water system in Tulare County, California. It reports serving 3,000 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 March 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,000
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Casillas Water System compare with other water systems in Tulare County?
By EPA's size categories, Casillas Water System is a small system (501 to 3,300 people). Tulare County has 274 active public water systems. Its population served is about 77% above the county average of 1,700 people per system, and accounts for 0.6% of the 465,710 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 Casillas Water System is about 21 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. 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 Casillas Water System?
EPA lists Casillas Water System 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. 184 of the 274 active systems in Tulare County (67%) are also privately owned.
Does Casillas Water System have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in March 2018. By type: 1 monitoring. The contaminant or rule involved is Revised Total Coliform 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 |
|---|---|---|---|---|
| 2018-03-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | 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.
Casillas Water System: frequently asked questions
Who runs Casillas Water System?
Casillas Water System (PWSID CA5403047) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Casillas Water System serve?
Casillas Water System reports serving 3,000 people through 1 service connection in Tulare County, California.
Where does Casillas Water System 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 Casillas Water System 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 March 2018. 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 Casillas Water System'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 March 2018. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Casillas Water System's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Casillas Water System 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 Tulare County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cws - Visalia | Tulare | 148,496 | Community | Groundwater |
| Tulare, City of | Tulare | 72,241 | Community | Groundwater |
| Porterville, City of | Tulare | 63,487 | Community | Groundwater |
| Dinuba, City of | Tulare | 27,281 | Community | Groundwater |
| Lindsay, City of | Tulare | 12,659 | Community | Surface water |
| Exeter, City of | Tulare | 11,169 | 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, “Casillas Water System, PWSID CA5403047, California”, https://aquacensus.com/water-systems/california/casillas-water-system-ca5403047 (data as of October 1, 2026).