Public water system · CA3610025
ActiveJoshua Basin Water District
At a glance
Joshua Basin Water District (PWSID CA3610025) is an active community water system in San Bernardino County, California. It reports serving 6,640 people through 4,884 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; all are health-based, and the most recent began in September 2003.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
6,640
Service connections
4,884
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Joshua Basin Water District compare with other water systems in San Bernardino County?
By EPA's size categories, Joshua Basin Water District is a medium system (3,301 to 10,000 people). San Bernardino County has 306 active public water systems. Its population served is about 28% below the county average of 9,227 people per system, and accounts for 0.2% of the 2,823,318 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active community water system reports serving 6,703 people, so Joshua Basin Water District is roughly in line with that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. California has 2,997 active 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 Joshua Basin Water District?
EPA lists Joshua Basin Water District as owned by a local 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. 74 of the 306 active systems in San Bernardino County (24%) are also owned by a local government.
Does Joshua Basin Water District have drinking water violations?
EPA's records list 3 violations for this system; all are health-based, and the most recent began in September 2003. The violations listed here began between June 1999 and September 2003. By type: 3 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (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 |
|---|---|---|---|---|
| 2003-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1999-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Joshua Basin Water District: frequently asked questions
Who runs Joshua Basin Water District?
Joshua Basin Water District (PWSID CA3610025) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does Joshua Basin Water District serve?
Joshua Basin Water District reports serving 6,640 people through 4,884 service connections in San Bernardino County, California.
Where does Joshua Basin Water District 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 Joshua Basin Water District have any drinking water violations?
EPA's records list 3 violations for this system; all are health-based, and the most recent began in September 2003. 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 Joshua Basin Water District'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; all are health-based, and the most recent began in September 2003. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find Joshua Basin Water District's water quality report?
As a community water system, Joshua Basin Water District must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in San Bernardino County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| San Gabriel Valley Wc - Fontana | San Bernardino | 237,700 | Community | Surface water |
| San Bernardino City | San Bernardino | 214,665 | Community | Groundwater |
| Cucamonga Valley Water District | San Bernardino | 211,069 | Community | Surface water |
| Ontario Municipal Utilities Company | San Bernardino | 185,010 | Community | Purchased surface water |
| Victorville Water District | San Bernardino | 135,983 | Community | Purchased surface water |
| San Bernardino Valley Wd | San Bernardino | 109,608 | Community | Groundwater |
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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, “Joshua Basin Water District, PWSID CA3610025, California”, https://aquacensus.com/water-systems/california/joshua-basin-water-district-ca3610025 (data as of October 1, 2026).