Public water system · CA0600033
ActiveWillow Creek M.W.C.-Lambertville
At a glance
Willow Creek M.W.C.-Lambertville (PWSID CA0600033) is an active transient non-community water system in Colusa County, California. It reports serving 31 people through 91 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 July 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
31
Service connections
91
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Willow Creek M.W.C.-Lambertville compare with other water systems in Colusa County?
By EPA's size categories, Willow Creek M.W.C.-Lambertville 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 less than 0.1% 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 transient non-community water system reports serving 144 people, so Willow Creek M.W.C.-Lambertville 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 Willow Creek M.W.C.-Lambertville?
EPA lists Willow Creek M.W.C.-Lambertville 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 Willow Creek M.W.C.-Lambertville have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in July 2022. By type: 1 monitoring. The contaminant or rule involved is Revised Total Coliform 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 |
|---|---|---|---|---|
| 2022-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | 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.
Willow Creek M.W.C.-Lambertville: frequently asked questions
Who runs Willow Creek M.W.C.-Lambertville?
Willow Creek M.W.C.-Lambertville (PWSID CA0600033) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Willow Creek M.W.C.-Lambertville serve?
Willow Creek M.W.C.-Lambertville reports serving 31 people through 91 service connections in Colusa County, California.
Where does Willow Creek M.W.C.-Lambertville 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 Willow Creek M.W.C.-Lambertville 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 July 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 Willow Creek M.W.C.-Lambertville'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 July 2022. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Willow Creek M.W.C.-Lambertville's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Willow Creek M.W.C.-Lambertville 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 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, “Willow Creek M.W.C.-Lambertville, PWSID CA0600033, California”, https://aquacensus.com/water-systems/california/willow-creek-m-w-c-lambertville-ca0600033 (data as of October 1, 2026).