Public water system · CA2500911
ActiveIsot Community Water System
At a glance
Isot Community Water System (PWSID CA2500911) is an active community water system in Modoc County, California. It reports serving 116 people through 55 service connections. Its primary water source is groundwater, 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 September 2005.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
116
Service connections
55
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Isot Community Water System compare with other water systems in Modoc County?
By EPA's size categories, Isot Community Water System is a very small system (500 people or fewer). Modoc County has 16 active public water systems. Its population served is about 67% below the county average of 347 people per system, and accounts for 2.1% of the 5,554 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 Isot Community Water System 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. 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 Isot Community Water System?
EPA lists Isot Community 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. 9 of the 16 active systems in Modoc County (56%) are also privately owned.
Does Isot Community Water System have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in September 2005. By type: 1 contaminant level above the legal limit. The contaminant or rule involved is Total coliform bacteria (TCR). 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 |
|---|---|---|---|---|
| 2005-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | 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.
Isot Community Water System: frequently asked questions
Who runs Isot Community Water System?
Isot Community Water System (PWSID CA2500911) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Isot Community Water System serve?
Isot Community Water System reports serving 116 people through 55 service connections in Modoc County, California.
Where does Isot Community 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 Isot Community Water System have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in September 2005. 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 Isot Community 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 health-based, and the most recent began in September 2005. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Isot Community Water System's water quality report?
As a community water system, Isot Community Water System 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 Modoc County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Alturas | Modoc | 2,715 | Community | Groundwater |
| California Pines C.S.D. | Modoc | 862 | Community | Groundwater |
| Newell County Water District | Modoc | 629 | Community | Groundwater |
| Cedarville County Water Dist. | Modoc | 600 | Community | Groundwater |
| Mdf-Blue Lake Cg | Modoc | 200 | Transient non-community | Groundwater |
| Cal Fire-Devil'S Garden Camp | Modoc | 120 | Non-transient non-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, “Isot Community Water System, PWSID CA2500911, California”, https://aquacensus.com/water-systems/california/isot-community-water-system-ca2500911 (data as of October 1, 2026).