Public water system · KS2001501

Active

Cassoday, City of

At a glance

City of Cassoday (PWSID KS2001501) is an active community water system in Butler County, Kansas. It reports serving 111 people through 149 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in June 2025.

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

Population served

111

Service connections

149

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDKS2001501

System typeCommunity water system

Activity statusActive

Population served111

Service connections149

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyKS state drinking water program

City servedCassoday

StateKansas

ZIP—

CountyButler County

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

By EPA's size categories, City of Cassoday is a very small system (500 people or fewer). Butler County has 21 active public water systems. Its population served is well below the county average of 2,310 people per system, and accounts for 0.2% of the 48,500 people reported by systems filed under the county. Across Kansas, the 1,041 active systems average 2,800 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Cassoday is well 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. Kansas has 863 active community water systems, 83% of the state's 1,041 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 278 Kansas systems (27%) list purchased surface water as their primary source.

Who owns and regulates City of Cassoday?

EPA lists City of Cassoday as owned by a local government. The KS state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 21 active systems in Butler County (95%) are also owned by a local government.

Does City of Cassoday have drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in June 2025. The violations listed here began between September 2019 and June 2025. By type: 6 contaminant level above the legal limit, 3 monitoring and reporting, 2 public notice, recordkeeping or other and 1 reporting. The contaminant or rule involved most often is Total trihalomethanes (TTHM) (4 of them). EPA lists 10 as resolved, 1 as archived and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2025-06-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Archived
2025-06-01	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Unaddressed
2021-10-31	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2020-06-30	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-06-30	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2020-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2020-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2020-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2019-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved
2019-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Haloacetic acids (HAA5)code 2456	Yes	Resolved
2019-09-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	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 Cassoday: frequently asked questions

Who runs City of Cassoday?

City of Cassoday (PWSID KS2001501) is a community water system owned by a local government. It is regulated by the KS state drinking water program.

How many people does City of Cassoday serve?

City of Cassoday reports serving 111 people through 149 service connections in Butler County, Kansas.

Where does City of Cassoday get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does City of Cassoday have any drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in June 2025. 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 Cassoday'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, 6 are health-based, and the most recent began in June 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the KS state drinking water program.

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

As a community water system, City of Cassoday 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 Butler County

Water system	County	Population served	Type	Source
El Dorado, City of	Butler	12,810	Community	Surface water
Augusta, City of	Butler	9,267	Community	Surface water
Butler Co Rwd 5	Butler	6,457	Community	Purchased surface water
Rose Hill, City of	Butler	4,269	Community	Purchased surface water
Butler Co Rwd 6	Butler	2,655	Community	Purchased surface water
Butler Co Rwd 4	Butler	1,565	Community	Purchased surface water

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “Cassoday, City of, PWSID KS2001501, Kansas”, https://aquacensus.com/water-systems/kansas/cassoday-city-of-ks2001501 (data as of October 1, 2026).