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
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Galesburg | Knox | 31,620 | Community | Groundwater |
| 2 | Abingdon | Knox | 3,275 | Community | Purchased groundwater |
| 3 | Knoxville | Knox | 3,120 | Community | Purchased groundwater |
| 4 | I74 Spoon River Rest Area | Knox | 2,356 | Transient non-community | Groundwater |
| 5 | Aqua Illinois-Oak Run | Knox | 1,885 | Community | Groundwater |
| 6 | Wataga | Knox | 965 | Community | Groundwater |
| 7 | East Galesburg | Knox | 860 | Community | Purchased groundwater |
| 8 | Yates City | Knox | 828 | Community | Groundwater |
| 9 | Williamsfield | Knox | 647 | Community | Groundwater |
| 10 | Oneida | Knox | 644 | Community | Groundwater |
| 11 | Altona | Knox | 483 | Community | Groundwater |
| 12 | Henderson | Knox | 375 | Community | Purchased groundwater |
| 13 | Victoria | Knox | 268 | Community | Groundwater |
| 14 | Rio | Knox | 265 | Community | Groundwater |
| 15 | Maquon | Knox | 218 | Community | Groundwater |
| 16 | Windwood Water System, Inc.. | Knox | 185 | Community | Purchased groundwater |
| 17 | Prairie Path Water Company-Cedar Water | Knox | 172 | Community | Groundwater |
| 18 | Lake Bracken Cc Clubhouse | Knox | 120 | Transient non-community | Groundwater |
| 19 | St Augustine | Knox | 119 | Community | Groundwater |
| 20 | Dahinda Um Church | Knox | 100 | Transient non-community | Groundwater |
| 21 | Gamber Cove | Knox | 100 | Transient non-community | Groundwater |
| 22 | Camp Akita/A Frame Well | Knox | 100 | Transient non-community | Groundwater |
| 23 | Faith Bible Camp | Knox | 50 | Transient non-community | Groundwater |
| 24 | Twisted Sisters Bar and Grill | Knox | 30 | Transient non-community | Groundwater |
| 25 | Cactus Country | Knox | 30 | Transient non-community | Groundwater |
| 26 | Cabin Fever Campground | Knox | 26 | Transient non-community | Groundwater |
| 27 | Double Tree Hills | Knox | 25 | Transient non-community | Groundwater |
| 28 | Knox Co Sportsmens Club | Knox | 25 | Transient non-community | Groundwater |
| 29 | Quick Stop | Knox | 25 | Transient non-community | Purchased groundwater |
| 30 | Stonefort Campground | Knox | 25 | Transient non-community | Groundwater |
| 31 | Woodland Hills Camping & Recreation | Knox | 25 | Transient non-community | Groundwater |
| 32 | Lake Bracken Cc Golf Course Bath Room | Knox | 25 | Transient non-community | Groundwater |
| 33 | Galesburg East Koa | Knox | 25 | Transient non-community | Groundwater |
| 34 | Happy Hollow Lake Ass C/O H Sm | Knox | 25 | Transient non-community | Groundwater |
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
- All Illinois public water systems· 3,872 active
- Stephenson County· 42 systems
- Jo Daviess County· 41 systems
- Carroll County· 35 systems
- Vermilion County· 35 systems
- Macoupin County· 32 systems
- Fulton County· 30 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
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).