Public water system · CA1010007

Active

City of Fresno

At a glance

City of Fresno (PWSID CA1010007) is an active community water system in Fresno County, California. It reports serving 545,716 people through 144,185 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in January 2016.

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

Population served

545,716

Service connections

144,185

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDCA1010007

System typeCommunity water system

Activity statusActive

Population served545,716

Service connections144,185

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyCA state drinking water program

City servedFresno

StateCalifornia

ZIP—

CountyFresno County

How does City of Fresno compare with other water systems in Fresno County?

By EPA's size categories, City of Fresno is a very large system (more than 100,000 people). Fresno County has 328 active public water systems, and City of Fresno is the largest of them by population served. Its population served is about 170 times the county average of 3,205 people per system, and accounts for 52% 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 City of Fresno is about 81 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 City of Fresno?

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

EPA's records list 11 violations for this system; 5 are health-based, and the most recent began in January 2016. The violations listed here began between September 1992 and January 2016. By type: 6 monitoring and reporting and 5 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 11 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, Regular · code 03	Nitratecode 1040	No	Resolved
2010-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Carbon, totalcode 2920	No	Resolved
2010-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2010-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2009-12-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	1,2-Dibromo-3-chloropropane (DBCP)code 2931	Yes	Resolved
1997-02-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1997-01-27	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Nitratecode 1040	Yes	Resolved
1994-04-01	Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25	Total coliform bacteria (TCR)code 3100	No	Resolved
1993-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1992-11-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1992-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved

All 11 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 Fresno: frequently asked questions

Who runs City of Fresno?

City of Fresno (PWSID CA1010007) 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 Fresno serve?

City of Fresno reports serving 545,716 people through 144,185 service connections in Fresno County, California.

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

EPA's records list 11 violations for this system; 5 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 City of Fresno'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 11 violations for this system; 5 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 City of Fresno's water quality report?

As a community water system, City of Fresno 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 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
Bakman Water Company	Fresno	17,393	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, “City of Fresno, PWSID CA1010007, California”, https://aquacensus.com/water-systems/california/city-of-fresno-ca1010007 (data as of October 1, 2026).