Public water system · CA3610004
ActiveWest Valley Water District
At a glance
West Valley Water District (PWSID CA3610004) is an active community water system in San Bernardino County, California. It reports serving 104,498 people through 23,436 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in January 2013.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
104,498
Service connections
23,436
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does West Valley Water District compare with other water systems in San Bernardino County?
By EPA's size categories, West Valley Water District is a very large system (more than 100,000 people). San Bernardino County has 306 active public water systems. Its population served is about 11 times the county average of 9,227 people per system, and accounts for 3.7% 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 West Valley Water District is about 16 times 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 609 California systems (8.1%) list surface water as their primary source.
Who owns and regulates West Valley Water District?
EPA lists West Valley 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 West Valley Water District have drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in January 2013. The violations listed here began between March 1987 and January 2013. By type: 4 contaminant level above the legal limit and 3 monitoring and reporting. The contaminant or rule involved most often is Nitrate (6 of them). EPA lists 4 as archived and 3 as resolved. 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. 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 |
|---|---|---|---|---|
| 2013-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2012-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2012-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1987-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1987-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1987-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
| 1987-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Archived |
All 7 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.
West Valley Water District: frequently asked questions
Who runs West Valley Water District?
West Valley Water District (PWSID CA3610004) is a community water system owned by a local government. It is regulated by the CA state drinking water program.
How many people does West Valley Water District serve?
West Valley Water District reports serving 104,498 people through 23,436 service connections in San Bernardino County, California.
Where does West Valley Water District get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does West Valley Water District have any drinking water violations?
EPA's records list 7 violations for this system; 4 are health-based, and the most recent began in January 2013. 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 West Valley 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 7 violations for this system; 4 are health-based, and the most recent began in January 2013. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.
Where can I find West Valley Water District's water quality report?
As a community water system, West Valley 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, “West Valley Water District, PWSID CA3610004, California”, https://aquacensus.com/water-systems/california/west-valley-water-district-ca3610004 (data as of October 1, 2026).