Public water system · KS2001511
ActiveEl Dorado, City of
At a glance
City of El Dorado (PWSID KS2001511) is an active community water system in Butler County, Kansas. It reports serving 12,810 people through 5,251 service connections. Its primary water source is surface water, 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 June 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
12,810
Service connections
5,251
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of El Dorado compare with other water systems in Butler County?
By EPA's size categories, City of El Dorado is a large system (10,001 to 100,000 people). Butler County has 21 active public water systems, and City of El Dorado is the largest of them by population served. Its population served is about 5.5 times the county average of 2,310 people per system, and accounts for 26% 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 El Dorado is about twice 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 75 Kansas systems (7.2%) list surface water as their primary source.
Who owns and regulates City of El Dorado?
EPA lists City of El Dorado 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 El Dorado have drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in June 2020. The violations listed here began between April 2006 and June 2020. By type: 6 monitoring and reporting, 5 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Carbon, total (7 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 |
|---|---|---|---|---|
| 2020-06-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2020-06-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2020-05-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2020-05-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2020-04-10 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2020-04-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2020-01-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2019-10-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2019-07-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2006-04-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | 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 El Dorado: frequently asked questions
Who runs City of El Dorado?
City of El Dorado (PWSID KS2001511) 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 El Dorado serve?
City of El Dorado reports serving 12,810 people through 5,251 service connections in Butler County, Kansas.
Where does City of El Dorado 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 El Dorado 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 June 2020. 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 El Dorado'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 June 2020. 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 El Dorado's water quality report?
As a community water system, City of El Dorado 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 |
|---|---|---|---|---|
| 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 |
| Douglass, City of | Butler | 1,551 | Community | Purchased surface water |
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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, “El Dorado, City of, PWSID KS2001511, Kansas”, https://aquacensus.com/water-systems/kansas/el-dorado-city-of-ks2001511 (data as of October 1, 2026).