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De Witt County, Illinois — public water systems

At a glance

14 active public water systems are filed under De Witt County, Illinois in EPA's SDWIS records, together reporting 12,370 people served. The largest is Clinton, which reports serving 7,200 people. 8 are community water systems serving people where they live; the other 6 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

14

Population served

12.4K

Community systems

8

Groundwater share

92.9%

How does De Witt County compare with other Illinois counties?

De Witt County has the 59th-most active public water systems among the 149 counties listed for active Illinois systems in EPA records; among the 104 with 3 or more systems, the median has 18. Its systems report 12,370 people served in total, the 76th-largest county figure in the state and less than 0.1% of the statewide total. The average system here reports serving 884 people, well below the Illinois average of 3,204. 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 De Witt County's drinking water come from?

By primary water source, De Witt County's active systems draw on groundwater (13, 93%) and surface water (1, 7.1%). Overall, 93% rely mainly on groundwater (including purchased groundwater) and 7.1% on surface water, compared with 82% and 18% across Illinois. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Clinton, draws primarily on groundwater.

What kinds of water systems operate in De Witt County?

De Witt County's active systems break down as 8 community systems (57%), 1 non-transient non-community systems (7.1%) and 5 transient non-community systems (36%). 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 non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. 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 (50%), private (36%) and state government (14%).

Water systems in De Witt County

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Active public water systems in De Witt County, Illinois
#Water systemCountyPopulation servedTypeSource
1ClintonDe Witt7,200CommunityGroundwater
2Farmer CityDe Witt1,811CommunityGroundwater
3Constellation Clinton Power StationDe Witt515Non-transient non-communitySurface water
4WapellaDe Witt513CommunityGroundwater
5Mascoutin SraDe Witt500Transient non-communityGroundwater
6WeldonDe Witt404CommunityGroundwater
7KenneyDe Witt400CommunityGroundwater
8WaynesvilleDe Witt381CommunityGroundwater
9Clinton Power Station Rec Area WellDe Witt200Transient non-communityGroundwater
10De WittDe Witt175CommunityGroundwater
11Little Galilee Christian AsmbyDe Witt150Transient non-communityGroundwater
12West Side MHPDe Witt71CommunityGroundwater
13Clinton MarinaDe Witt25Transient non-communityGroundwater
14Weldon Springs Sp Day UseDe Witt25Transient non-communityGroundwater

De Witt County water systems: frequently asked questions

How many public water systems are in De Witt County, Illinois?

EPA's SDWIS records file 14 active public water systems under De Witt County, Illinois: 8 community systems (57%), 1 non-transient non-community systems (7.1%) and 5 transient non-community systems (36%).

Who supplies drinking water in De Witt County, IL?

The largest community water systems filed under De Witt County are Clinton (7,200 people served), Farmer City (1,811 people served) and Wapella (513 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 De Witt County's drinking water come from groundwater or surface water?

Of the 14 active public water systems in De Witt County, 93% draw mainly on groundwater and 7.1% on surface water, counting purchased supplies. The largest system, Clinton, uses groundwater.

Where can I find a water quality report for De Witt 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. 8 community systems are filed under De Witt 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 De Witt 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 Illinois 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 De Witt County, Illinois”, https://aquacensus.com/water-systems/illinois/de-witt (data as of October 1, 2026).