Public water system · CA5301113
ActiveClark System
At a glance
Clark System (PWSID CA5301113) is an active transient non-community water system in Trinity County, California. It reports serving 450 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 3 violations for this system; all are health-based, and the most recent began in June 2009.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
450
Service connections
5
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Clark System compare with other water systems in Trinity County?
By EPA's size categories, Clark System is a very small system (500 people or fewer). Trinity County has 42 active public water systems, and Clark System is the 5th-largest of them by population served. Its population served is about 30% above the county average of 347 people per system, and accounts for 3.1% of the 14,561 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 Clark System is about 3.1 times 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 Clark System?
EPA lists Clark System 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. 9 of the 42 active systems in Trinity County (21%) are also owned by the federal government.
Does Clark System have drinking water violations?
EPA's records list 3 violations for this system; all are health-based, and the most recent began in June 2009. The violations listed here began between June 1996 and June 2009. By type: 3 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2009-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1997-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1996-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 3 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.
Clark System: frequently asked questions
Who runs Clark System?
Clark System (PWSID CA5301113) 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 Clark System serve?
Clark System reports serving 450 people through 5 service connections in Trinity County, California.
Where does Clark System 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 Clark System have any drinking water violations?
EPA's records list 3 violations for this system; all are health-based, and the most recent began in June 2009. 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 Clark System'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 3 violations for this system; all are health-based, and the most recent began in June 2009. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Clark System's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Clark System 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 Trinity County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Weaverville C.S.D. | Trinity | 3,975 | Community | Surface water |
| Trinity Co. W.W. Dist #1 | Trinity | 2,324 | Community | Surface water |
| Trinity Center M.W.C. | Trinity | 729 | Community | Surface water |
| Lewiston Community Services District | Trinity | 677 | Community | Surface water |
| Hayward Flat Campground | Trinity | 440 | Transient non-community | Groundwater |
| Tannery Gulch Campground | Trinity | 410 | Transient non-community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Clark System, PWSID CA5301113, California”, https://aquacensus.com/water-systems/california/clark-system-ca5301113 (data as of October 1, 2026).