Public water system · CA1810001
ActiveCity of Susanville
At a glance
City of Susanville (PWSID CA1810001) is an active community water system in Lassen County, California. It reports serving 7,811 people through 3,758 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; all are health-based, and the most recent began in July 2003.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
7,811
Service connections
3,758
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Susanville compare with other water systems in Lassen County?
By EPA's size categories, City of Susanville is a medium system (3,301 to 10,000 people). Lassen County has 51 active public water systems, and City of Susanville is the largest of them by population served. Its population served is about 16 times the county average of 476 people per system, and accounts for 32% 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 City of Susanville is about 17% above 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 City of Susanville?
EPA lists City of Susanville 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 City of Susanville have drinking water violations?
EPA's records list 4 violations for this system; all are health-based, and the most recent began in July 2003. The violations listed here began between September 2001 and July 2003. By type: 4 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 4 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 |
|---|---|---|---|---|
| 2003-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2001-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 4 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.
City of Susanville: frequently asked questions
Who runs City of Susanville?
City of Susanville (PWSID CA1810001) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does City of Susanville serve?
City of Susanville reports serving 7,811 people through 3,758 service connections in Lassen County, California.
Where does City of Susanville 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 City of Susanville have any drinking water violations?
EPA's records list 4 violations for this system; all are health-based, and the most recent began in July 2003. 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 City of Susanville'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 4 violations for this system; all are health-based, and the most recent began in July 2003. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find City of Susanville's water quality report?
As a community water system, City of Susanville 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 |
|---|---|---|---|---|
| Cdcr-High Desert State Prison | Lassen | 3,857 | Community | Groundwater |
| Herlong Public Utility District | Lassen | 2,114 | Community | Groundwater |
| Westwood C.S.D. | Lassen | 1,662 | 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, “City of Susanville, PWSID CA1810001, California”, https://aquacensus.com/water-systems/california/city-of-susanville-ca1810001 (data as of October 1, 2026).