Public water system · CA4700573
ActiveCaltrans-Dunsmuir Grade Insp. Facility
At a glance
Caltrans-Dunsmuir Grade Insp. Facility (PWSID CA4700573) is an active non-transient non-community water system in Siskiyou County, California. It reports serving 200 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
200
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Caltrans-Dunsmuir Grade Insp. Facility compare with other water systems in Siskiyou County?
By EPA's size categories, Caltrans-Dunsmuir Grade Insp. Facility is a very small system (500 people or fewer). Siskiyou County has 69 active public water systems. Its population served is about 66% below the county average of 593 people per system, and accounts for 0.5% of the 40,908 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 Caltrans-Dunsmuir Grade Insp. Facility is about half of 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 Caltrans-Dunsmuir Grade Insp. Facility?
EPA lists Caltrans-Dunsmuir Grade Insp. Facility as owned by a state 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. 5 of the 69 active systems in Siskiyou County (7.2%) are also owned by a state government.
Does Caltrans-Dunsmuir Grade Insp. Facility have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 2022. The violations listed here began between April 2018 and January 2022. By type: 2 monitoring and 1 required treatment not met. The contaminant or rule involved most often is Revised Total Coliform Rule (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 |
|---|---|---|---|---|
| 2022-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-10-20 | Required treatment not metTreatment Technique, Level 1 Assessment (RTCR) · code 2A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2018-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | 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.
Caltrans-Dunsmuir Grade Insp. Facility: frequently asked questions
Who runs Caltrans-Dunsmuir Grade Insp. Facility?
Caltrans-Dunsmuir Grade Insp. Facility (PWSID CA4700573) is a non-transient non-community water system owned by a state government. It is regulated by the CA state drinking water program.
How many people does Caltrans-Dunsmuir Grade Insp. Facility serve?
Caltrans-Dunsmuir Grade Insp. Facility reports serving 200 people through 1 service connection in Siskiyou County, California.
Where does Caltrans-Dunsmuir Grade Insp. Facility 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 Caltrans-Dunsmuir Grade Insp. Facility have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in January 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 Caltrans-Dunsmuir Grade Insp. Facility'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; 1 is health-based, and the most recent began in January 2022. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Caltrans-Dunsmuir Grade Insp. Facility's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Caltrans-Dunsmuir Grade Insp. Facility 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 Siskiyou County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Yreka, City of | Siskiyou | 7,825 | Community | Surface water |
| Mt. Shasta, City of | Siskiyou | 3,642 | Community | Groundwater |
| Mt. Shasta Ski Park | Siskiyou | 3,500 | Transient non-community | Groundwater |
| Lake Shastina C.S.D | Siskiyou | 2,790 | Community | Groundwater |
| Weed, City of | Siskiyou | 2,662 | Community | Groundwater |
| Lake Siskiyou Campground | Siskiyou | 1,800 | Transient non-community | Surface water |
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, “Caltrans-Dunsmuir Grade Insp. Facility, PWSID CA4700573, California”, https://aquacensus.com/water-systems/california/caltrans-dunsmuir-grade-insp-facility-ca4700573 (data as of October 1, 2026).