Public water system · CA4700558
ActiveCaltrans-Grass Lake Rest Stop
At a glance
Caltrans-Grass Lake Rest Stop (PWSID CA4700558) is an active transient non-community water system in Siskiyou County, California. It reports serving 600 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 one violation for this system; it is not health-based, and the most recent began in August 1984.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
600
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Caltrans-Grass Lake Rest Stop compare with other water systems in Siskiyou County?
By EPA's size categories, Caltrans-Grass Lake Rest Stop is a small system (501 to 3,300 people). Siskiyou County has 69 active public water systems. Its population served is roughly in line with the county average of 593 people per system, and accounts for 1.5% 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 transient non-community water system reports serving 144 people, so Caltrans-Grass Lake Rest Stop is about 4.2 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 Caltrans-Grass Lake Rest Stop?
EPA lists Caltrans-Grass Lake Rest Stop 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-Grass Lake Rest Stop have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in August 1984. By type: 1 public notice, recordkeeping or other. EPA lists 1 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 |
|---|---|---|---|---|
| 1984-08-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
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.
Caltrans-Grass Lake Rest Stop: frequently asked questions
Who runs Caltrans-Grass Lake Rest Stop?
Caltrans-Grass Lake Rest Stop (PWSID CA4700558) is a 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-Grass Lake Rest Stop serve?
Caltrans-Grass Lake Rest Stop reports serving 600 people through 1 service connection in Siskiyou County, California.
Where does Caltrans-Grass Lake Rest Stop 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-Grass Lake Rest Stop 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 August 1984. 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-Grass Lake Rest Stop'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 August 1984. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Caltrans-Grass Lake Rest Stop's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Caltrans-Grass Lake Rest Stop 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 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 |
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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, “Caltrans-Grass Lake Rest Stop, PWSID CA4700558, California”, https://aquacensus.com/water-systems/california/caltrans-grass-lake-rest-stop-ca4700558 (data as of October 1, 2026).