Public water system · CA2810007
ActiveTown of Yountville
At a glance
Town of Yountville (PWSID CA2810007) is an active community water system in Napa County, California. It reports serving 2,787 people through 844 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in June 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,787
Service connections
844
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Town of Yountville compare with other water systems in Napa County?
By EPA's size categories, Town of Yountville is a small system (501 to 3,300 people). Napa County has 188 active public water systems, and Town of Yountville is the 6th-largest of them by population served. Its population served is about 3.2 times the county average of 861 people per system, and accounts for 1.7% 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 community water system reports serving 6,703 people, so Town of Yountville 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates Town of Yountville?
EPA lists Town of Yountville 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. 15 of the 188 active systems in Napa County (8%) are also owned by a local government.
Does Town of Yountville have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in June 2022. The violations listed here began between November 1994 and June 2022. By type: 3 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 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 |
|---|---|---|---|---|
| 2022-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2009-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-11-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | 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.
Town of Yountville: frequently asked questions
Who runs Town of Yountville?
Town of Yountville (PWSID CA2810007) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Town of Yountville serve?
Town of Yountville reports serving 2,787 people through 844 service connections in Napa County, California.
Where does Town of Yountville get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Town of Yountville have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in June 2022. 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 Town of Yountville'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 4 violations for this system; none is health-based, and the most recent began in June 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Town of Yountville's water quality report?
As a community water system, Town of Yountville 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 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 |
| Pacific Union College | Napa | 1,958 | 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, “Town of Yountville, PWSID CA2810007, California”, https://aquacensus.com/water-systems/california/town-of-yountville-ca2810007 (data as of October 1, 2026).