Public water system · CA1300583
ActiveCaltrans, Sand Hill Rest Stop
At a glance
Caltrans, Sand Hill Rest Stop (PWSID CA1300583) is an active transient non-community water system in Imperial County, California. It reports serving 26 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
26
Service connections
2
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Caltrans, Sand Hill Rest Stop compare with other water systems in Imperial County?
By EPA's size categories, Caltrans, Sand Hill Rest Stop is a very small system (500 people or fewer). Imperial County has 76 active public water systems. Its population served is well below the county average of 2,444 people per system, and accounts for less than 0.1% of the 185,748 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, Sand Hill Rest Stop is well below 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, Sand Hill Rest Stop?
EPA lists Caltrans, Sand Hill 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. 7 of the 76 active systems in Imperial County (9.2%) are also owned by a state government.
Does Caltrans, Sand Hill Rest Stop have drinking water violations?
EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2023. The violations listed here began between July 2006 and April 2023. By type: 6 monitoring and reporting and 4 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (4 of them). EPA lists 9 as resolved and 1 as archived. 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. 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 |
|---|---|---|---|---|
| 2023-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 2023-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2013-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2012-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-07-26 | Monitoring and reportingMonitoring, Regular · code 03 | Nitritecode 1041 | No | Resolved |
| 2007-07-26 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 10 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, Sand Hill Rest Stop: frequently asked questions
Who runs Caltrans, Sand Hill Rest Stop?
Caltrans, Sand Hill Rest Stop (PWSID CA1300583) 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, Sand Hill Rest Stop serve?
Caltrans, Sand Hill Rest Stop reports serving 26 people through 2 service connections in Imperial County, California.
Where does Caltrans, Sand Hill 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, Sand Hill Rest Stop have any drinking water violations?
EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2023. 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, Sand Hill 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 10 violations for this system; none is health-based, and the most recent began in April 2023. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Caltrans, Sand Hill Rest Stop's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Caltrans, Sand Hill 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 Imperial County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| El Centro, City of | Imperial | 43,772 | Community | Purchased surface water |
| Calexico, City of | Imperial | 40,357 | Community | Purchased surface water |
| Brawley, City of | Imperial | 26,862 | Community | Purchased surface water |
| Imperial, City of | Imperial | 21,591 | Community | Purchased surface water |
| Imperial Valley College | Imperial | 8,150 | Non-transient non-community | Surface water |
| Gswc - Calipatria | Imperial | 7,363 | 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, “Caltrans, Sand Hill Rest Stop, PWSID CA1300583, California”, https://aquacensus.com/water-systems/california/caltrans-sand-hill-rest-stop-ca1300583 (data as of October 1, 2026).