Public water system · CA4600078
ActiveTnf-Union Flat Cg
At a glance
Tnf-Union Flat Cg (PWSID CA4600078) is an active transient non-community water system in Sierra County, California. It reports serving 40 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 2 violations for this system; none is health-based, and the most recent began in August 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
40
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Tnf-Union Flat Cg compare with other water systems in Sierra County?
By EPA's size categories, Tnf-Union Flat Cg is a very small system (500 people or fewer). Sierra County has 32 active public water systems. Its population served is well below the county average of 224 people per system, and accounts for 0.6% of the 7,169 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 Tnf-Union Flat Cg 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 Tnf-Union Flat Cg?
EPA lists Tnf-Union Flat 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. 11 of the 32 active systems in Sierra County (34%) are also owned by the federal government.
Does Tnf-Union Flat Cg have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in August 2024. The violations listed here began between August 1984 and August 2024. By type: 1 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved is Revised Total Coliform Rule. EPA lists 1 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 1984-08-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
All 2 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.
Tnf-Union Flat Cg: frequently asked questions
Who runs Tnf-Union Flat Cg?
Tnf-Union Flat Cg (PWSID CA4600078) 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 Tnf-Union Flat Cg serve?
Tnf-Union Flat Cg reports serving 40 people through 1 service connection in Sierra County, California.
Where does Tnf-Union Flat 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 Tnf-Union Flat Cg have any drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in August 2024. 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 Tnf-Union Flat 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 2 violations for this system; none is health-based, and the most recent began in August 2024. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Tnf-Union Flat Cg's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Tnf-Union Flat 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 Sierra County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Tnf-Logger & Stampede Rc | Sierra | 1,200 | Transient non-community | Groundwater |
| City of Loyalton | Sierra | 983 | Community | Groundwater |
| Downieville Public U.D. | Sierra | 783 | Community | Surface water |
| Sierra Csa #5, Sierra Brooks | Sierra | 726 | Community | Groundwater |
| Sierra Water Resources - Sierra City | Sierra | 324 | Community | Groundwater |
| Bassett'S Station | Sierra | 300 | 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, “Tnf-Union Flat Cg, PWSID CA4600078, California”, https://aquacensus.com/water-systems/california/tnf-union-flat-cg-ca4600078 (data as of October 1, 2026).