Public water system · CA1100258
ActiveCaltrans-Willows Reststop-Sb
At a glance
Caltrans-Willows Reststop-Sb (PWSID CA1100258) is an active transient non-community water system in Glenn County, California. It reports serving 7,500 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 5 violations for this system; 1 is health-based, and the most recent began in October 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
7,500
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Caltrans-Willows Reststop-Sb compare with other water systems in Glenn County?
By EPA's size categories, Caltrans-Willows Reststop-Sb is a medium system (3,301 to 10,000 people). Glenn County has 34 active public water systems, and Caltrans-Willows Reststop-Sb is the 2nd-largest of them by population served. Its population served is about 6.9 times the county average of 1,085 people per system, and accounts for 20% of the 36,902 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-Willows Reststop-Sb is about 52 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-Willows Reststop-Sb?
EPA lists Caltrans-Willows Reststop-Sb 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. 4 of the 34 active systems in Glenn County (12%) are also owned by a state government.
Does Caltrans-Willows Reststop-Sb have drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in October 2020. The violations listed here began between September 1992 and October 2020. By type: 3 monitoring and reporting, 1 monitoring and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2020-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2012-03-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2010-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1992-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 5 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-Willows Reststop-Sb: frequently asked questions
Who runs Caltrans-Willows Reststop-Sb?
Caltrans-Willows Reststop-Sb (PWSID CA1100258) 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-Willows Reststop-Sb serve?
Caltrans-Willows Reststop-Sb reports serving 7,500 people through 1 service connection in Glenn County, California.
Where does Caltrans-Willows Reststop-Sb 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-Willows Reststop-Sb have any drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in October 2020. 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-Willows Reststop-Sb'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 5 violations for this system; 1 is health-based, and the most recent began in October 2020. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Caltrans-Willows Reststop-Sb's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Caltrans-Willows Reststop-Sb 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 Glenn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Orland | Glenn | 8,298 | Community | Groundwater |
| Caltrans-Willows Reststop-Nb | Glenn | 7,500 | Transient non-community | Groundwater |
| Cal-Water Service Co.-Willows | Glenn | 7,240 | Community | Groundwater |
| Cal-Water Service Co.-Hamilton City | Glenn | 1,799 | Community | Groundwater |
| Sacramento Nat. Wildlife Refuge | Glenn | 824 | Transient non-community | Groundwater |
| Johns Manville | Glenn | 340 | Non-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, “Caltrans-Willows Reststop-Sb, PWSID CA1100258, California”, https://aquacensus.com/water-systems/california/caltrans-willows-reststop-sb-ca1100258 (data as of October 1, 2026).