Public water system · CA5700532
ActiveYolo Bypass Wildlife Area
At a glance
Yolo Bypass Wildlife Area (PWSID CA5700532) is an active transient non-community water system in Yolo County, California. It reports serving 25 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list 11 violations for this system; 9 are health-based, and the most recent began in January 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
25
Service connections
5
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Yolo Bypass Wildlife Area compare with other water systems in Yolo County?
By EPA's size categories, Yolo Bypass Wildlife Area is a very small system (500 people or fewer). Yolo County has 88 active public water systems. Its population served is well below the county average of 2,951 people per system, and accounts for less than 0.1% of the 259,714 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Yolo Bypass Wildlife Area is well below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. California has 3,016 active transient non-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 Yolo Bypass Wildlife Area?
EPA lists Yolo Bypass Wildlife Area as owned by a state 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 88 active systems in Yolo County (3.4%) are also owned by a state government.
Does Yolo Bypass Wildlife Area have drinking water violations?
EPA's records list 11 violations for this system; 9 are health-based, and the most recent began in January 2023. The violations listed here began between September 1998 and January 2023. By type: 9 contaminant level above the legal limit, 1 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (9 of them). EPA lists 11 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 |
|---|---|---|---|---|
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2016-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2012-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2005-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2005-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2004-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1998-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 11 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.
Yolo Bypass Wildlife Area: frequently asked questions
Who runs Yolo Bypass Wildlife Area?
Yolo Bypass Wildlife Area (PWSID CA5700532) is a transient non-community water system owned by a state government. It is regulated by the CA state drinking water program.
How many people does Yolo Bypass Wildlife Area serve?
Yolo Bypass Wildlife Area reports serving 25 people through 5 service connections in Yolo County, California.
Where does Yolo Bypass Wildlife Area 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 Yolo Bypass Wildlife Area have any drinking water violations?
EPA's records list 11 violations for this system; 9 are health-based, and the most recent began in January 2023. 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 Yolo Bypass Wildlife Area'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 11 violations for this system; 9 are health-based, and the most recent began in January 2023. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Yolo Bypass Wildlife Area's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Yolo Bypass Wildlife Area is a 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 Yolo County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Davis | Yolo | 67,457 | Community | Purchased surface water |
| City of Woodland | Yolo | 61,462 | Community | Purchased surface water |
| City of West Sacramento | Yolo | 53,355 | Community | Surface water |
| Uc - Davis | Yolo | 49,616 | Community | Purchased surface water |
| City of Winters | Yolo | 7,115 | Community | Groundwater |
| Esparto C.S.D. | Yolo | 3,574 | 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, “Yolo Bypass Wildlife Area, PWSID CA5700532, California”, https://aquacensus.com/water-systems/california/yolo-bypass-wildlife-area-ca5700532 (data as of October 1, 2026).