Public water system · KS2009110
ActiveWater District 1 of Johnson Co
At a glance
Water District 1 of Johnson Co (PWSID KS2009110) is an active community water system in Johnson County, Kansas. It reports serving 490,000 people through 157,481 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2002.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
490,000
Service connections
157,481
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Water District 1 of Johnson Co compare with other water systems in Johnson County?
By EPA's size categories, Water District 1 of Johnson Co is a very large system (more than 100,000 people). Johnson County has 8 active public water systems, and Water District 1 of Johnson Co is the largest of them by population served. Its population served is about 5.8 times the county average of 83,844 people per system, and accounts for 73% of the 670,749 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 Water District 1 of Johnson Co is about 73 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. 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 Water District 1 of Johnson Co?
EPA lists Water District 1 of Johnson Co 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. 7 of the 8 active systems in Johnson County (88%) are also owned by a local government.
Does Water District 1 of Johnson Co have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2002. The violations listed here began between July 2000 and January 2002. By type: 2 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Consumer Confidence Rule (2 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2002-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloritecode 1009 | No | Resolved |
| 2001-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2000-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 3 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.
Water District 1 of Johnson Co: frequently asked questions
Who runs Water District 1 of Johnson Co?
Water District 1 of Johnson Co (PWSID KS2009110) is a community water system owned by a local government. It is regulated by the KS state drinking water program.
How many people does Water District 1 of Johnson Co serve?
Water District 1 of Johnson Co reports serving 490,000 people through 157,481 service connections in Johnson County, Kansas.
Where does Water District 1 of Johnson Co 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 Water District 1 of Johnson Co have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2002. 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 Water District 1 of Johnson Co'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 3 violations for this system; none is health-based, and the most recent began in January 2002. For current results, consult the system's annual water quality report, EPA ECHO, or the KS state drinking water program.
Where can I find Water District 1 of Johnson Co's water quality report?
As a community water system, Water District 1 of Johnson Co 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 Johnson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Olathe, City of | Johnson | 143,014 | Community | Surface water |
| Gardner, City of | Johnson | 23,942 | Community | Surface water |
| Johnson Co Rwd 7 | Johnson | 6,457 | Community | Purchased surface water |
| Desoto, City of | Johnson | 4,645 | Community | Groundwater |
| Edgerton, City of | Johnson | 1,741 | Community | Purchased surface water |
| New Century Air Center | Johnson | 500 | Non-transient non-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, “Water District 1 of Johnson Co, PWSID KS2009110, Kansas”, https://aquacensus.com/water-systems/kansas/water-district-1-of-johnson-co-ks2009110 (data as of October 1, 2026).