Allen County, Kansas — public water systems
At a glance
14 active public water systems are filed under Allen County, Kansas in EPA's SDWIS records, together reporting 9,991 people served. The largest is City of Iola, which reports serving 5,343 people. All 14 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
14
Population served
10K
Community systems
14
Groundwater share
0%
How does Allen County compare with other Kansas counties?
Allen County has the 22nd-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 9,991 people served in total, the 37th-largest county figure in the state and 0.3% of the statewide total. The average system here reports serving 714 people, well 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 Allen County's drinking water come from?
By primary water source, Allen County's active systems draw on purchased surface water (11, 79%) and surface water (3, 21%). Overall, none rely mainly on groundwater (including purchased groundwater) and all on surface water, compared with 66% and 34% across Kansas. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. The county's largest system, City of Iola, draws primarily on surface water.
What kinds of water systems operate in Allen County?
Allen County's active systems break down as 14 community systems (100%). 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. EPA lists their owner types as local government (100%).
Water systems in Allen County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Iola, City of | Allen | 5,343 | Community | Surface water |
| 2 | Humboldt, City of | Allen | 1,836 | Community | Surface water |
| 3 | Allen Co Rwd 8 | Allen | 736 | Community | Purchased surface water |
| 4 | Gas City, City of | Allen | 501 | Community | Purchased surface water |
| 5 | La Harpe, City of | Allen | 484 | Community | Purchased surface water |
| 6 | Moran, City of | Allen | 467 | Community | Purchased surface water |
| 7 | Allen Co Rwd 15 | Allen | 135 | Community | Purchased surface water |
| 8 | Allen Co Rwd 16 | Allen | 133 | Community | Purchased surface water |
| 9 | Allen Co Rwd 10 | Allen | 125 | Community | Purchased surface water |
| 10 | Allen Co Rwd 13 | Allen | 100 | Community | Purchased surface water |
| 11 | Allen Co Rwd 4 | Allen | 52 | Community | Purchased surface water |
| 12 | Allen Co Rwd 6 | Allen | 45 | Community | Purchased surface water |
| 13 | Allen Co Rwd 12 | Allen | 33 | Community | Purchased surface water |
| 14 | Public Wholesale Wsd 5 | Allen | 1 | Community | Surface water |
Allen County water systems: frequently asked questions
How many public water systems are in Allen County, Kansas?
EPA's SDWIS records file 14 active public water systems under Allen County, Kansas: 14 community systems (100%).
Who supplies drinking water in Allen County, KS?
The largest community water systems filed under Allen County are City of Iola (5,343 people served), City of Humboldt (1,836 people served) and Allen Co Rwd 8 (736 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 Allen County's drinking water come from groundwater or surface water?
Of the 14 active public water systems in Allen County, none draw mainly on groundwater and all on surface water, counting purchased supplies. The largest system, City of Iola, uses surface water.
Where can I find a water quality report for Allen 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. 14 community systems are filed under Allen 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 Allen 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
- All Kansas public water systems· 1,041 active
- Labette County· 15 systems
- McPherson County· 15 systems
- Neosho County· 15 systems
- Tulare County· 14 systems
- Ellis County· 14 systems
- Franklin County· 14 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 Allen County, Kansas”, https://aquacensus.com/water-systems/kansas/allen (data as of October 1, 2026).