Public water system · CA1900040

Active

Tn Truss

At a glance

Tn Truss (PWSID CA1900040) is an active non-transient non-community water system in Los Angeles County, California. It reports serving 45 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 9 violations for this system; all are health-based, and the most recent began in January 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDCA1900040

System typeNon-transient non-community water system

Activity statusActive

Population served45

Service connections2

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyCA state drinking water program

City served—

StateCalifornia

ZIP—

CountyLos Angeles County

How does Tn Truss compare with other water systems in Los Angeles County?

By EPA's size categories, Tn Truss is a very small system (500 people or fewer). Los Angeles County has 275 active public water systems. Its population served is well below the county average of 36,762 people per system, and accounts for less than 0.1% of the 10,109,668 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Tn Truss is well below that figure.

What does “non-transient non-community water system” mean?

A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. California has 1,466 active non-transient non-community water systems, 20% 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 Tn Truss?

EPA lists Tn Truss 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. 150 of the 275 active systems in Los Angeles County (55%) are also privately owned.

Does Tn Truss have drinking water violations?

EPA's records list 9 violations for this system; all are health-based, and the most recent began in January 2025. The violations listed here began between January 2023 and January 2025. By type: 9 contaminant level above the legal limit. The contaminant or rule involved most often is Arsenic (9 of them). EPA lists 9 as archived. 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
2025-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2024-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2024-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2024-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2024-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2023-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2023-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2023-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2023-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived

All 9 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.

Tn Truss: frequently asked questions

Who runs Tn Truss?

Tn Truss (PWSID CA1900040) is a non-transient non-community water system privately owned. It is regulated by the CA state drinking water program.

How many people does Tn Truss serve?

Tn Truss reports serving 45 people through 2 service connections in Los Angeles County, California.

Where does Tn Truss 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 Tn Truss have any drinking water violations?

EPA's records list 9 violations for this system; all are health-based, and the most recent began in January 2025. 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 Tn Truss' 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 9 violations for this system; all are health-based, and the most recent began in January 2025. For current results, consult EPA ECHO, or the CA state drinking water program.

Where can I find Tn Truss' water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Tn Truss is a non-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 Los Angeles County

Water system	County	Population served	Type	Source
Los Angeles-City, Dept. of Water & Power	Los Angeles	3,875,566	Community	Surface water
Long Beach Utilities Department	Los Angeles	466,772	Community	Purchased surface water
Santa Clarita Valley Water Agency	Los Angeles	294,090	Community	Surface water
Gswc - Southwest	Los Angeles	277,740	Community	Purchased surface water
San Gabriel Valley Water Co.-El Monte	Los Angeles	248,000	Community	Groundwater
Los Angeles Cwwd 40 Reg 4 & 34 Lancaster	Los Angeles	208,129	Community	Purchased surface water

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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, “Tn Truss, PWSID CA1900040, California”, https://aquacensus.com/water-systems/california/tn-truss-ca1900040 (data as of October 1, 2026).