Public water system · CA3400229
ActiveRio Cosumnes Correctional Center [Sws]
At a glance
Rio Cosumnes Correctional Center [Sws] (PWSID CA3400229) is an active community water system in Sacramento County, California. It reports serving 2,800 people through 13 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in October 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,800
Service connections
13
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Rio Cosumnes Correctional Center [Sws] compare with other water systems in Sacramento County?
By EPA's size categories, Rio Cosumnes Correctional Center [Sws] is a small system (501 to 3,300 people). Sacramento County has 164 active public water systems. Its population served is well below the county average of 10,325 people per system, and accounts for 0.2% of the 1,693,284 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 Rio Cosumnes Correctional Center [Sws] is about 58% 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 Rio Cosumnes Correctional Center [Sws]?
EPA lists Rio Cosumnes Correctional Center [Sws] 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. 37 of the 164 active systems in Sacramento County (23%) are also owned by a local government.
Does Rio Cosumnes Correctional Center [Sws] have drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in October 2024. The violations listed here began between January 1983 and October 2024. By type: 5 public notice, recordkeeping or other, 1 required treatment not met, 1 reporting, 1 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Lead and Copper Rule Revisions (2 of them). EPA lists 6 as archived, 2 as unaddressed and 1 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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 |
|---|---|---|---|---|
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Unaddressed |
| 2024-10-17 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 1998-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | 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 |
| 1984-02-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1983-01-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1983-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Arseniccode 1005 | Yes | Archived |
All 9 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.
Rio Cosumnes Correctional Center [Sws]: frequently asked questions
Who runs Rio Cosumnes Correctional Center [Sws]?
Rio Cosumnes Correctional Center [Sws] (PWSID CA3400229) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Rio Cosumnes Correctional Center [Sws] serve?
Rio Cosumnes Correctional Center [Sws] reports serving 2,800 people through 13 service connections in Sacramento County, California.
Where does Rio Cosumnes Correctional Center [Sws] 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 Rio Cosumnes Correctional Center [Sws] have any drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in October 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 Rio Cosumnes Correctional Center [Sws]'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 9 violations for this system; 2 are health-based, and the most recent began in October 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 Rio Cosumnes Correctional Center [Sws]'s water quality report?
As a community water system, Rio Cosumnes Correctional Center [Sws] 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 Sacramento County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Sacramento Main | Sacramento | 527,979 | Community | Surface water |
| Sacramento Suburban Water District | Sacramento | 194,444 | Community | Purchased surface water |
| Scwa - Laguna/Vineyard | Sacramento | 184,896 | Community | Surface water |
| Folsom, City of - Main | Sacramento | 80,969 | Community | Surface water |
| Citrus Heights Water District | Sacramento | 67,818 | Community | Purchased surface water |
| Cal Am - Suburban Rosemont | Sacramento | 54,793 | Community | Purchased 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, “Rio Cosumnes Correctional Center [Sws], PWSID CA3400229, California”, https://aquacensus.com/water-systems/california/rio-cosumnes-correctional-center-sws-ca3400229 (data as of October 1, 2026).