Public water system · CA1610003

Active

Hanford, City of

At a glance

City of Hanford (PWSID CA1610003) is an active community water system in Kings County, California. It reports serving 62,127 people through 19,077 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 October 2023.

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

Population served

62,127

Service connections

19,077

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDCA1610003

System typeCommunity water system

Activity statusActive

Population served62,127

Service connections19,077

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyCA state drinking water program

City servedHanford

StateCalifornia

ZIP—

CountyKings County

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

By EPA's size categories, City of Hanford is a large system (10,001 to 100,000 people). Kings County has 43 active public water systems, and City of Hanford is the largest of them by population served. Its population served is about 17 times the county average of 3,626 people per system, and accounts for 40% of the 155,929 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 Hanford is about 9.3 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 Hanford?

EPA lists City of Hanford 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. 15 of the 43 active systems in Kings County (35%) are also owned by a local government.

Does City of Hanford have drinking water violations?

Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in October 2023. The violations listed here began between December 2012 and October 2023. By type: 10 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 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
2023-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2021-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2021-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2020-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2020-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2014-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2014-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2014-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2014-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2014-06-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2014-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2012-12-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	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 Hanford: frequently asked questions

Who runs City of Hanford?

City of Hanford (PWSID CA1610003) 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 Hanford serve?

City of Hanford reports serving 62,127 people through 19,077 service connections in Kings County, California.

Where does City of Hanford 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 Hanford 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 October 2023. 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 Hanford'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 October 2023. 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 Hanford's water quality report?

As a community water system, City of Hanford 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 Kings County

Water system	County	Population served	Type	Source
Lemoore, City of	Kings	27,185	Community	Groundwater
Corcoran, City of	Kings	22,808	Community	Groundwater
Lemoore Naval Air Station	Kings	15,000	Community	Surface water
Avenal, City of	Kings	13,696	Community	Surface water
Armona Community Services Dist	Kings	4,143	Community	Groundwater
Home Garden Csd	Kings	1,750	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, “Hanford, City of, PWSID CA1610003, California”, https://aquacensus.com/water-systems/california/hanford-city-of-ca1610003 (data as of October 1, 2026).