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Jefferson County, Kansas — public water systems

At a glance

19 active public water systems are filed under Jefferson County, Kansas in EPA's SDWIS records, together reporting 20,164 people served. The largest is Jefferson Co Rwd 12, which reports serving 3,635 people. 18 are community water systems serving people where they live; the other 1 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

19

Population served

20.2K

Community systems

18

Groundwater share

84.2%

How does Jefferson County compare with other Kansas counties?

Jefferson County has the 4th-most active public water systems among the 136 counties listed for active Kansas systems in EPA records; among the 101 with 3 or more systems, the median has 9. Its systems report 20,164 people served in total, the 27th-largest county figure in the state and 0.7% of the statewide total. The average system here reports serving 1,061 people, about 62% below the Kansas average of 2,800. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Jefferson County's drinking water come from?

By primary water source, Jefferson County's active systems draw on groundwater (14, 74%), purchased surface water (2, 11%), purchased groundwater (2, 11%) and surface water (1, 5.3%). Overall, 84% rely mainly on groundwater (including purchased groundwater) and 16% on surface water, compared with 66% and 34% across Kansas. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Jefferson Co Rwd 12, draws primarily on purchased surface water.

What kinds of water systems operate in Jefferson County?

Jefferson County's active systems break down as 18 community systems (95%) and 1 transient non-community systems (5.3%). 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. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as local government (89%) and private (11%).

Water systems in Jefferson County

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Active public water systems in Jefferson County, Kansas
#Water systemCountyPopulation servedTypeSource
1Jefferson Co Rwd 12Jefferson3,635CommunityPurchased surface water
2Jefferson Co Rwd 3Jefferson2,435CommunityGroundwater
3Jefferson Co Rwd 1Jefferson2,343CommunityGroundwater
4Jefferson Co Rwd 13Jefferson2,115CommunityGroundwater
5Jefferson Co Rwd 7Jefferson1,180CommunityGroundwater
6Oskaloosa, City ofJefferson1,086CommunityPurchased groundwater
7Valley Falls, City ofJefferson1,086CommunitySurface water
8Perry, City ofJefferson858CommunityGroundwater
9Mclouth, City ofJefferson858CommunityGroundwater
10Jefferson Co Rwd 2Jefferson642CommunityGroundwater
11Ozawkie, City ofJefferson636CommunityGroundwater
12Nortonville, City ofJefferson599CommunityPurchased surface water
13Jefferson Co Rwd 15Jefferson563CommunityPurchased groundwater
14Jefferson Co Rwd 11Jefferson483CommunityGroundwater
15Winchester, City ofJefferson450CommunityGroundwater
16Jefferson Co Rwd 9Jefferson352CommunityGroundwater
17Lakeside Village Improvement DistJefferson343CommunityGroundwater
18Jefferson Co Rwd 10Jefferson300CommunityGroundwater
19Campers ParadiseJefferson200Transient non-communityGroundwater

Jefferson County water systems: frequently asked questions

How many public water systems are in Jefferson County, Kansas?

EPA's SDWIS records file 19 active public water systems under Jefferson County, Kansas: 18 community systems (95%) and 1 transient non-community systems (5.3%).

Who supplies drinking water in Jefferson County, KS?

The largest community water systems filed under Jefferson County are Jefferson Co Rwd 12 (3,635 people served), Jefferson Co Rwd 3 (2,435 people served) and Jefferson Co Rwd 1 (2,343 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Jefferson County's drinking water come from groundwater or surface water?

Of the 19 active public water systems in Jefferson County, 84% draw mainly on groundwater and 16% on surface water, counting purchased supplies. The largest system, Jefferson Co Rwd 12, uses purchased surface water.

Where can I find a water quality report for Jefferson County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 18 community systems are filed under Jefferson County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Jefferson County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More Kansas water systems

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, “Public water systems in Jefferson County, Kansas”, https://aquacensus.com/water-systems/kansas/jefferson (data as of October 1, 2026).