Public water system · CA0605011
ActiveDel Oro Wc - Arbuckle District
At a glance
Del Oro Wc - Arbuckle District (PWSID CA0605011) is an active community water system in Colusa County, California. It reports serving 185 people through 56 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
185
Service connections
56
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Del Oro Wc - Arbuckle District compare with other water systems in Colusa County?
By EPA's size categories, Del Oro Wc - Arbuckle District is a very small system (500 people or fewer). Colusa County has 29 active public water systems. Its population served is well below the county average of 1,211 people per system, and accounts for 0.5% of the 35,121 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 Del Oro Wc - Arbuckle District 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 Del Oro Wc - Arbuckle District?
EPA lists Del Oro Wc - Arbuckle District 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. 19 of the 29 active systems in Colusa County (66%) are also privately owned.
Does Del Oro Wc - Arbuckle District have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2014. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2014-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
The one violation in EPA's records.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.
Del Oro Wc - Arbuckle District: frequently asked questions
Who runs Del Oro Wc - Arbuckle District?
Del Oro Wc - Arbuckle District (PWSID CA0605011) is a community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Del Oro Wc - Arbuckle District serve?
Del Oro Wc - Arbuckle District reports serving 185 people through 56 service connections in Colusa County, California.
Where does Del Oro Wc - Arbuckle District 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 Del Oro Wc - Arbuckle District have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2014. 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 Del Oro Wc - Arbuckle District'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 one violation for this system; it is not health-based, and the most recent began in October 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Del Oro Wc - Arbuckle District's water quality report?
As a community water system, Del Oro Wc - Arbuckle District 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 Colusa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Caltrans-Maxwell Reststops | Colusa | 15,000 | Transient non-community | Groundwater |
| City of Colusa | Colusa | 6,447 | Community | Groundwater |
| City of Williams | Colusa | 5,538 | Community | Groundwater |
| Arbuckle Public Utility District | Colusa | 2,778 | Community | Groundwater |
| Maxwell Public Utility District | Colusa | 1,175 | Community | Groundwater |
| Colusa Industrial Properties | Colusa | 533 | Non-transient non-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, “Del Oro Wc - Arbuckle District, PWSID CA0605011, California”, https://aquacensus.com/water-systems/california/del-oro-wc-arbuckle-district-ca0605011 (data as of October 1, 2026).