Public water system · CA0600056
ActiveMenf-Letts Lake Cg
At a glance
Menf-Letts Lake Cg (PWSID CA0600056) is an active transient non-community water system in Colusa County, California. It reports serving 118 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
118
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Menf-Letts Lake Cg compare with other water systems in Colusa County?
By EPA's size categories, Menf-Letts Lake Cg 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 0.3% 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 Menf-Letts Lake Cg is about 18% 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 Menf-Letts Lake Cg?
EPA lists Menf-Letts Lake Cg as owned by the federal 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. 2 of the 29 active systems in Colusa County (6.9%) are also owned by the federal government.
Does Menf-Letts Lake Cg have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2017. By type: 1 monitoring and reporting. The contaminant or rule involved is Nitrate. 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 |
|---|---|---|---|---|
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | 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.
Menf-Letts Lake Cg: frequently asked questions
Who runs Menf-Letts Lake Cg?
Menf-Letts Lake Cg (PWSID CA0600056) is a transient non-community water system owned by the federal government. It is regulated by the CA state drinking water program.
How many people does Menf-Letts Lake Cg serve?
Menf-Letts Lake Cg reports serving 118 people through 1 service connection in Colusa County, California.
Where does Menf-Letts Lake Cg 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 Menf-Letts Lake Cg 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 January 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 Menf-Letts Lake Cg'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 January 2017. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Menf-Letts Lake Cg's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Menf-Letts Lake Cg 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, “Menf-Letts Lake Cg, PWSID CA0600056, California”, https://aquacensus.com/water-systems/california/menf-letts-lake-cg-ca0600056 (data as of October 1, 2026).