Public water system · CA5700712
ActiveCal Am - Dunnigan
At a glance
Cal Am - Dunnigan (PWSID CA5700712) is an active community water system in Yolo County, California. It reports serving 602 people through 184 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in September 1998.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
602
Service connections
184
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cal Am - Dunnigan compare with other water systems in Yolo County?
By EPA's size categories, Cal Am - Dunnigan is a small system (501 to 3,300 people). 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 0.2% 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 community water system reports serving 6,703 people, so Cal Am - Dunnigan 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 Cal Am - Dunnigan?
EPA lists Cal Am - Dunnigan as privately owned. 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. 69 of the 88 active systems in Yolo County (78%) are also privately owned.
Does Cal Am - Dunnigan have drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in September 1998. The violations listed here began between May 1997 and September 1998. By type: 3 contaminant level above the legal limit, 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 1998-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1998-05-18 | Public notice, recordkeeping or otherNotification, Public · code 06 | Nitratecode 1040 | No | Resolved |
| 1997-09-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-05-20 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
All 5 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.
Cal Am - Dunnigan: frequently asked questions
Who runs Cal Am - Dunnigan?
Cal Am - Dunnigan (PWSID CA5700712) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Cal Am - Dunnigan serve?
Cal Am - Dunnigan reports serving 602 people through 184 service connections in Yolo County, California.
Where does Cal Am - Dunnigan 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 Cal Am - Dunnigan have any drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in September 1998. 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 Cal Am - Dunnigan'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 5 violations for this system; 3 are health-based, and the most recent began in September 1998. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Cal Am - Dunnigan's water quality report?
As a community water system, Cal Am - Dunnigan 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 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, “Cal Am - Dunnigan, PWSID CA5700712, California”, https://aquacensus.com/water-systems/california/cal-am-dunnigan-ca5700712 (data as of October 1, 2026).