Public water system · CA1810700
ActiveSierra Army Depot
At a glance
Sierra Army Depot (PWSID CA1810700) is an active non-transient non-community water system in Lassen County, California. It reports serving 1,200 people through 285 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 8 violations for this system; 3 are health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,200
Service connections
285
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Sierra Army Depot compare with other water systems in Lassen County?
By EPA's size categories, Sierra Army Depot is a small system (501 to 3,300 people). Lassen County has 51 active public water systems, and Sierra Army Depot is the 6th-largest of them by population served. Its population served is about 152% above the county average of 476 people per system, and accounts for 4.9% 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 non-transient non-community water system reports serving 430 people, so Sierra Army Depot is about 179% above that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. California has 1,466 active non-transient non-community water systems, 20% 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 Sierra Army Depot?
EPA lists Sierra Army Depot as owned by the federal 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. 3 of the 51 active systems in Lassen County (5.9%) are also owned by the federal government.
Does Sierra Army Depot have drinking water violations?
EPA's records list 8 violations for this system; 3 are health-based, and the most recent began in July 2025. The violations listed here began between January 2007 and July 2025. By type: 4 monitoring and reporting, 3 contaminant level above the legal limit and 1 reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 7 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2015-05-01 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2015-05-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2010-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2010-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
All 8 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.
Sierra Army Depot: frequently asked questions
Who runs Sierra Army Depot?
Sierra Army Depot (PWSID CA1810700) is a non-transient non-community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Sierra Army Depot serve?
Sierra Army Depot reports serving 1,200 people through 285 service connections in Lassen County, California.
Where does Sierra Army Depot 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 Sierra Army Depot have any drinking water violations?
EPA's records list 8 violations for this system; 3 are health-based, and the most recent began in July 2025. 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 Sierra Army Depot'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 8 violations for this system; 3 are health-based, and the most recent began in July 2025. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Sierra Army Depot's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Sierra Army Depot is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
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 |
| Westwood C.S.D. | Lassen | 1,662 | Community | Groundwater |
| Lassen Community College Dist. | Lassen | 1,380 | 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, “Sierra Army Depot, PWSID CA1810700, California”, https://aquacensus.com/water-systems/california/sierra-army-depot-ca1810700 (data as of October 1, 2026).