Public water system · CA4600009
ActiveSierra Csa #5, Sierra Brooks
At a glance
Sierra Csa #5, Sierra Brooks (PWSID CA4600009) is an active community water system in Sierra County, California. It reports serving 726 people through 224 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
726
Service connections
224
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Sierra Csa #5, Sierra Brooks compare with other water systems in Sierra County?
By EPA's size categories, Sierra Csa #5, Sierra Brooks is a small system (501 to 3,300 people). Sierra County has 32 active public water systems, and Sierra Csa #5, Sierra Brooks is the 4th-largest of them by population served. Its population served is about 3.2 times the county average of 224 people per system, and accounts for 10% of the 7,169 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 Sierra Csa #5, Sierra Brooks 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 Sierra Csa #5, Sierra Brooks?
EPA lists Sierra Csa #5, Sierra Brooks 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. 6 of the 32 active systems in Sierra County (19%) are also owned by a local government.
Does Sierra Csa #5, Sierra Brooks have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 2024. The violations listed here began between October 1980 and August 2024. By type: 8 public notice, recordkeeping or other, 3 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Gross alpha (excluding radon and uranium) (2 of them). EPA lists 10 as archived and 2 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. 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 |
|---|---|---|---|---|
| 2024-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 1993-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1984-09-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-08-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-07-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1983-12-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1983-11-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1983-02-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1982-11-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1982-10-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1981-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
| 1980-10-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
The 12 most recent 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 Csa #5, Sierra Brooks: frequently asked questions
Who runs Sierra Csa #5, Sierra Brooks?
Sierra Csa #5, Sierra Brooks (PWSID CA4600009) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Sierra Csa #5, Sierra Brooks serve?
Sierra Csa #5, Sierra Brooks reports serving 726 people through 224 service connections in Sierra County, California.
Where does Sierra Csa #5, Sierra Brooks 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 Csa #5, Sierra Brooks have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 2024. 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 Csa #5, Sierra Brooks' 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. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in August 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Sierra Csa #5, Sierra Brooks' water quality report?
As a community water system, Sierra Csa #5, Sierra Brooks 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 Sierra County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Tnf-Logger & Stampede Rc | Sierra | 1,200 | Transient non-community | Groundwater |
| City of Loyalton | Sierra | 983 | Community | Groundwater |
| Downieville Public U.D. | Sierra | 783 | Community | Surface water |
| Sierra Water Resources - Sierra City | Sierra | 324 | Community | Groundwater |
| Tnf-Aspen Creek/Pass Creek | Sierra | 300 | Transient non-community | Groundwater |
| Bassett'S Station | Sierra | 300 | Transient non-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 Csa #5, Sierra Brooks, PWSID CA4600009, California”, https://aquacensus.com/water-systems/california/sierra-csa-5-sierra-brooks-ca4600009 (data as of October 1, 2026).