Public water system · CA1010028

Active

Riverdale Public Utility District

At a glance

Riverdale Public Utility District (PWSID CA1010028) is an active community water system in Fresno County, California. It reports serving 2,756 people through 900 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, 10 are health-based, and the most recent began in January 2016.

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

Population served

2,756

Service connections

900

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDCA1010028

System typeCommunity water system

Activity statusActive

Population served2,756

Service connections900

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyCA state drinking water program

City served—

StateCalifornia

ZIP—

CountyFresno County

How does Riverdale Public Utility District compare with other water systems in Fresno County?

By EPA's size categories, Riverdale Public Utility District is a small system (501 to 3,300 people). Fresno County has 328 active public water systems. Its population served is about 14% below the county average of 3,205 people per system, and accounts for 0.3% of the 1,051,276 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 Riverdale Public Utility District is about 59% below 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 Riverdale Public Utility District?

EPA lists Riverdale Public Utility 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. 89 of the 328 active systems in Fresno County (27%) are also owned by a local government.

Does Riverdale Public Utility District have drinking water violations?

Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in January 2016. The violations listed here began between April 2012 and January 2016. By type: 10 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Arsenic (9 of them). EPA lists 12 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
2016-01-01	Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04	Nitratecode 1040	No	Resolved
2014-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2014-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2013-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2013-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2013-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2012-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2012-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2012-04-01	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.

Riverdale Public Utility District: frequently asked questions

Who runs Riverdale Public Utility District?

Riverdale Public Utility District (PWSID CA1010028) is a community water system owned by a local government. It is regulated by the CA state drinking water program.

How many people does Riverdale Public Utility District serve?

Riverdale Public Utility District reports serving 2,756 people through 900 service connections in Fresno County, California.

Where does Riverdale Public Utility 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 Riverdale Public Utility District have any drinking water violations?

Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in January 2016. 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 Riverdale Public Utility 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. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in January 2016. For current results, consult the system's annual water quality report, EPA ECHO, or the CA state drinking water program.

Where can I find Riverdale Public Utility District's water quality report?

As a community water system, Riverdale Public Utility 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 Fresno County

Water system	County	Population served	Type	Source
City of Fresno	Fresno	545,716	Community	Surface water
City of Clovis	Fresno	130,130	Community	Surface water
California State University Fresno	Fresno	41,000	Community	Groundwater
Cws - Selma	Fresno	26,517	Community	Groundwater
City of Sanger	Fresno	26,357	Community	Groundwater
Reedley, City of	Fresno	26,076	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, “Riverdale Public Utility District, PWSID CA1010028, California”, https://aquacensus.com/water-systems/california/riverdale-public-utility-district-ca1010028 (data as of October 1, 2026).