Public water system · CA3610001

Active

Adelanto, City of

At a glance

City of Adelanto (PWSID CA3610001) is an active community water system in San Bernardino County, California. It reports serving 39,930 people through 8,318 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in January 2024.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

39,930

Service connections

8,318

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDCA3610001

System typeCommunity water system

Activity statusActive

Population served39,930

Service connections8,318

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyCA state drinking water program

City servedAdelanto

StateCalifornia

ZIP—

CountySan Bernardino County

How does City of Adelanto compare with other water systems in San Bernardino County?

By EPA's size categories, City of Adelanto is a large system (10,001 to 100,000 people). San Bernardino County has 306 active public water systems. Its population served is about 4.3 times the county average of 9,227 people per system, and accounts for 1.4% 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 City of Adelanto is about 6 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. 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 City of Adelanto?

EPA lists City of Adelanto 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 City of Adelanto have drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in January 2024. The violations listed here began between April 2010 and January 2024. By type: 7 monitoring and reporting and 5 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrate (5 of them). EPA lists 11 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
2024-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Archived
2018-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2015-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2014-06-01	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2013-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2011-09-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2011-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2011-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2010-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2010-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2010-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved

The 12 most recent 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.

City of Adelanto: frequently asked questions

Who runs City of Adelanto?

City of Adelanto (PWSID CA3610001) is a community water system owned by a local government. It is regulated by the CA state drinking water program.

How many people does City of Adelanto serve?

City of Adelanto reports serving 39,930 people through 8,318 service connections in San Bernardino County, California.

Where does City of Adelanto 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 City of Adelanto have any drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in January 2024. 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 City of Adelanto'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. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in January 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.

Where can I find City of Adelanto's water quality report?

As a community water system, City of Adelanto 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, “Adelanto, City of, PWSID CA3610001, California”, https://aquacensus.com/water-systems/california/adelanto-city-of-ca3610001 (data as of October 1, 2026).