Public water system · CA2801011
ActiveDomaine Carneros
At a glance
Domaine Carneros (PWSID CA2801011) is an active non-transient non-community water system in Napa County, California. It reports serving 652 people through 3 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in April 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
652
Service connections
3
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Domaine Carneros compare with other water systems in Napa County?
By EPA's size categories, Domaine Carneros is a small system (501 to 3,300 people). Napa County has 188 active public water systems. Its population served is about 24% below the county average of 861 people per system, and accounts for 0.4% of the 161,950 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 Domaine Carneros is about 52% 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 Domaine Carneros?
EPA lists Domaine Carneros 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. 168 of the 188 active systems in Napa County (89%) are also privately owned.
Does Domaine Carneros have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in April 2017. The violations listed here began between December 2004 and April 2017. By type: 3 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Arsenic (2 of them). EPA lists 4 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 |
|---|---|---|---|---|
| 2017-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2009-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2008-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2004-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 4 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.
Domaine Carneros: frequently asked questions
Who runs Domaine Carneros?
Domaine Carneros (PWSID CA2801011) is a non-transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Domaine Carneros serve?
Domaine Carneros reports serving 652 people through 3 service connections in Napa County, California.
Where does Domaine Carneros 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 Domaine Carneros have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in April 2017. 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 Domaine Carneros' 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 4 violations for this system; 1 is health-based, and the most recent began in April 2017. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Domaine Carneros' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Domaine Carneros 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 Napa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Napa, City of | Napa | 84,804 | Community | Surface water |
| American Canyon, City of | Napa | 21,437 | Community | Surface water |
| Phelps Vineyards | Napa | 19,412 | Non-transient non-community | Groundwater |
| Calistoga, City of | Napa | 5,610 | Community | Surface water |
| St. Helena, City of | Napa | 5,386 | Community | Surface water |
| Town of Yountville | Napa | 2,787 | 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, “Domaine Carneros, PWSID CA2801011, California”, https://aquacensus.com/water-systems/california/domaine-carneros-ca2801011 (data as of October 1, 2026).