Public water system · CA1710015
ActiveHidden Valley Lake Csd
At a glance
Hidden Valley Lake Csd (PWSID CA1710015) is an active community water system in Lake County, California. It reports serving 6,235 people through 2,518 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is health-based, and the most recent began in October 2004.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
6,235
Service connections
2,518
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hidden Valley Lake Csd compare with other water systems in Lake County?
By EPA's size categories, Hidden Valley Lake Csd is a medium system (3,301 to 10,000 people). Lake County has 81 active public water systems, and Hidden Valley Lake Csd is the 2nd-largest of them by population served. Its population served is about 7 times the county average of 895 people per system, and accounts for 8.6% of the 72,454 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 Hidden Valley Lake Csd is roughly in line with 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 Hidden Valley Lake Csd?
EPA lists Hidden Valley Lake Csd 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. 17 of the 81 active systems in Lake County (21%) are also owned by a local government.
Does Hidden Valley Lake Csd have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in October 2004. 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 |
|---|---|---|---|---|
| 2004-10-01 | 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.
Hidden Valley Lake Csd: frequently asked questions
Who runs Hidden Valley Lake Csd?
Hidden Valley Lake Csd (PWSID CA1710015) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Hidden Valley Lake Csd serve?
Hidden Valley Lake Csd reports serving 6,235 people through 2,518 service connections in Lake County, California.
Where does Hidden Valley Lake Csd 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 Hidden Valley Lake Csd have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in October 2004. 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 Hidden Valley Lake Csd'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 October 2004. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Hidden Valley Lake Csd's water quality report?
As a community water system, Hidden Valley Lake Csd 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 Lake County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Highlands Mutual Water Company | Lake | 7,772 | Community | Surface water |
| Konocti County Water District | Lake | 5,928 | Community | Surface water |
| Lakeport, City of | Lake | 4,762 | Community | Surface water |
| Golden State Water Co.-Clearlake System | Lake | 4,644 | Community | Surface water |
| Mt. Konocti Mutual Water Company | Lake | 4,360 | Community | Surface water |
| Kelseyville Co Waterworks District 3 | Lake | 4,102 | 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, “Hidden Valley Lake Csd, PWSID CA1710015, California”, https://aquacensus.com/water-systems/california/hidden-valley-lake-csd-ca1710015 (data as of October 1, 2026).