Public water system · CA1710021
ActiveLake County Csa 21 - North Lakeport
At a glance
Lake County Csa 21 - North Lakeport (PWSID CA1710021) is an active community water system in Lake County, California. It reports serving 4,046 people through 1,226 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 2 violations for this system; all are health-based, and the most recent began in January 2008.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
4,046
Service connections
1,226
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Lake County Csa 21 - North Lakeport compare with other water systems in Lake County?
By EPA's size categories, Lake County Csa 21 - North Lakeport is a medium system (3,301 to 10,000 people). Lake County has 81 active public water systems. Its population served is about 4.5 times the county average of 895 people per system, and accounts for 5.6% 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 Lake County Csa 21 - North Lakeport is about 40% 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. 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 Lake County Csa 21 - North Lakeport?
EPA lists Lake County Csa 21 - North Lakeport 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 Lake County Csa 21 - North Lakeport have drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in January 2008. The violations listed here began between October 1999 and January 2008. By type: 2 required treatment not met. The contaminants or rules involved are Interim Enhanced Surface Water Treatment Rule and Surface Water Treatment Rule. EPA lists 2 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 |
|---|---|---|---|---|
| 2008-01-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 1999-10-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Resolved |
All 2 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.
Lake County Csa 21 - North Lakeport: frequently asked questions
Who runs Lake County Csa 21 - North Lakeport?
Lake County Csa 21 - North Lakeport (PWSID CA1710021) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Lake County Csa 21 - North Lakeport serve?
Lake County Csa 21 - North Lakeport reports serving 4,046 people through 1,226 service connections in Lake County, California.
Where does Lake County Csa 21 - North Lakeport 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 Lake County Csa 21 - North Lakeport have any drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in January 2008. 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 Lake County Csa 21 - North Lakeport'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 2 violations for this system; all are health-based, and the most recent began in January 2008. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Lake County Csa 21 - North Lakeport's water quality report?
As a community water system, Lake County Csa 21 - North Lakeport 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 |
| Hidden Valley Lake Csd | Lake | 6,235 | Community | Groundwater |
| 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 |
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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, “Lake County Csa 21 - North Lakeport, PWSID CA1710021, California”, https://aquacensus.com/water-systems/california/lake-county-csa-21-north-lakeport-ca1710021 (data as of October 1, 2026).