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Knox County, Illinois — public water systems

At a glance

34 active public water systems are filed under Knox County, Illinois in EPA's SDWIS records, together reporting 49,041 people served. The largest is Galesburg, which reports serving 31,620 people. 17 are community water systems serving people where they live; the other 17 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

34

Population served

49K

Community systems

17

Groundwater share

100%

How does Knox County compare with other Illinois counties?

Knox County has the 33rd-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 49,041 people served in total, the 26th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 1,442 people, about half of 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 Knox County's drinking water come from?

By primary water source, Knox County's active systems draw on groundwater (28, 82%) and purchased groundwater (6, 18%). Overall, all rely mainly on groundwater (including purchased groundwater) and none 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, Galesburg, draws primarily on groundwater.

What kinds of water systems operate in Knox County?

Knox County's active systems break down as 17 community systems (50%) and 17 transient non-community systems (50%). 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 private (44%), local government (41%), public/private partnership (12%) and state government (2.9%).

Water systems in Knox County

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Active public water systems in Knox County, Illinois
#Water systemCountyPopulation servedTypeSource
1GalesburgKnox31,620CommunityGroundwater
2AbingdonKnox3,275CommunityPurchased groundwater
3KnoxvilleKnox3,120CommunityPurchased groundwater
4I74 Spoon River Rest AreaKnox2,356Transient non-communityGroundwater
5Aqua Illinois-Oak RunKnox1,885CommunityGroundwater
6WatagaKnox965CommunityGroundwater
7East GalesburgKnox860CommunityPurchased groundwater
8Yates CityKnox828CommunityGroundwater
9WilliamsfieldKnox647CommunityGroundwater
10OneidaKnox644CommunityGroundwater
11AltonaKnox483CommunityGroundwater
12HendersonKnox375CommunityPurchased groundwater
13VictoriaKnox268CommunityGroundwater
14RioKnox265CommunityGroundwater
15MaquonKnox218CommunityGroundwater
16Windwood Water System, Inc..Knox185CommunityPurchased groundwater
17Prairie Path Water Company-Cedar WaterKnox172CommunityGroundwater
18Lake Bracken Cc ClubhouseKnox120Transient non-communityGroundwater
19St AugustineKnox119CommunityGroundwater
20Dahinda Um ChurchKnox100Transient non-communityGroundwater
21Gamber CoveKnox100Transient non-communityGroundwater
22Camp Akita/A Frame WellKnox100Transient non-communityGroundwater
23Faith Bible CampKnox50Transient non-communityGroundwater
24Twisted Sisters Bar and GrillKnox30Transient non-communityGroundwater
25Cactus CountryKnox30Transient non-communityGroundwater
26Cabin Fever CampgroundKnox26Transient non-communityGroundwater
27Double Tree HillsKnox25Transient non-communityGroundwater
28Knox Co Sportsmens ClubKnox25Transient non-communityGroundwater
29Quick StopKnox25Transient non-communityPurchased groundwater
30Stonefort CampgroundKnox25Transient non-communityGroundwater
31Woodland Hills Camping & RecreationKnox25Transient non-communityGroundwater
32Lake Bracken Cc Golf Course Bath RoomKnox25Transient non-communityGroundwater
33Galesburg East KoaKnox25Transient non-communityGroundwater
34Happy Hollow Lake Ass C/O H SmKnox25Transient non-communityGroundwater

Knox County water systems: frequently asked questions

How many public water systems are in Knox County, Illinois?

EPA's SDWIS records file 34 active public water systems under Knox County, Illinois: 17 community systems (50%) and 17 transient non-community systems (50%).

Who supplies drinking water in Knox County, IL?

The largest community water systems filed under Knox County are Galesburg (31,620 people served), Abingdon (3,275 people served) and Knoxville (3,120 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 Knox County's drinking water come from groundwater or surface water?

Of the 34 active public water systems in Knox County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Galesburg, uses groundwater.

Where can I find a water quality report for Knox 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. 17 community systems are filed under Knox 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 Knox 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 Knox County, Illinois”, https://aquacensus.com/water-systems/illinois/knox (data as of October 1, 2026).