Public water system · CA1810002
ActiveWestwood C.S.D.
At a glance
Westwood C.S.D. (PWSID CA1810002) is an active community water system in Lassen County, California. It reports serving 1,662 people through 949 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; all are health-based, and the most recent began in August 2011.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,662
Service connections
949
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Westwood C.S.D. compare with other water systems in Lassen County?
By EPA's size categories, Westwood C.S.D. is a small system (501 to 3,300 people). Lassen County has 51 active public water systems, and Westwood C.S.D. is the 4th-largest of them by population served. Its population served is about 3.5 times the county average of 476 people per system, and accounts for 6.9% of the 24,257 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 Westwood C.S.D. 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 Westwood C.S.D.?
EPA lists Westwood C.S.D. 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. 15 of the 51 active systems in Lassen County (29%) are also owned by a local government.
Does Westwood C.S.D. have drinking water violations?
EPA's records list 7 violations for this system; all are health-based, and the most recent began in August 2011. The violations listed here began between February 2001 and August 2011. By type: 7 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (7 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2011-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2001-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2001-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2001-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 7 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.
Westwood C.S.D.: frequently asked questions
Who runs Westwood C.S.D.?
Westwood C.S.D. (PWSID CA1810002) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Westwood C.S.D. serve?
Westwood C.S.D. reports serving 1,662 people through 949 service connections in Lassen County, California.
Where does Westwood C.S.D. 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 Westwood C.S.D. have any drinking water violations?
EPA's records list 7 violations for this system; all are health-based, and the most recent began in August 2011. 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 Westwood C.S.D.'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 7 violations for this system; all are health-based, and the most recent began in August 2011. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Westwood C.S.D.'s water quality report?
As a community water system, Westwood C.S.D. 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 Lassen County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Susanville | Lassen | 7,811 | Community | Groundwater |
| Cdcr-High Desert State Prison | Lassen | 3,857 | Community | Groundwater |
| Herlong Public Utility District | Lassen | 2,114 | Community | Groundwater |
| Lassen Community College Dist. | Lassen | 1,380 | Non-transient non-community | Groundwater |
| Sierra Army Depot | Lassen | 1,200 | Non-transient non-community | Groundwater |
| Leavitt Lake Csd | Lassen | 950 | 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, “Westwood C.S.D., PWSID CA1810002, California”, https://aquacensus.com/water-systems/california/westwood-c-s-d-ca1810002 (data as of October 1, 2026).