DeKalb County, Missouri — public water systems
At a glance
6 active public water systems are filed under DeKalb County, Missouri in EPA's SDWIS records, together reporting 10,695 people served. The largest is Dekalb County Pwsd 1, which reports serving 7,635 people. All 6 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
6
Population served
10.7K
Community systems
6
Groundwater share
100%
How does DeKalb County compare with other Missouri counties?
DeKalb County has the 97th-most active public water systems among the 182 counties listed for active Missouri systems in EPA records; among the 132 with 3 or more systems, the median has 13. Its systems report 10,695 people served in total, the 72nd-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 1,783 people, about 13% below the Missouri average of 2,049. 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 DeKalb County's drinking water come from?
By primary water source, DeKalb County's active systems draw on purchased groundwater (6, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 92% and 8.1% across Missouri. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. The county's largest system, Dekalb County Pwsd 1, draws primarily on purchased groundwater.
What kinds of water systems operate in DeKalb County?
DeKalb County's active systems break down as 6 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 (83%) and private (17%).
Water systems in DeKalb County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Dekalb County Pwsd 1 | DeKalb | 7,635 | Community | Purchased groundwater |
| 2 | Maysville Pws | DeKalb | 1,096 | Community | Purchased groundwater |
| 3 | Mo American Stewartsville | DeKalb | 928 | Community | Purchased groundwater |
| 4 | Osborn Pws | DeKalb | 405 | Community | Purchased groundwater |
| 5 | Union Star Pws | DeKalb | 386 | Community | Purchased groundwater |
| 6 | Clarksdale Pws | DeKalb | 245 | Community | Purchased groundwater |
Also serving DeKalb County
These systems serve several counties, including DeKalb County. EPA lists another county first for them, so they are not included in the counts above.
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Mo American St Joseph | Andrew + 2 more | 89,171 | Community | Groundwater |
| Clinton County Pwsd 3 | Daviess + 3 more | 3,722 | Community | Purchased surface water |
| Great Northwest Wholesale Water Commiss | Atchison + 10 more | 25 | Community | Purchased groundwater |
DeKalb County water systems: frequently asked questions
How many public water systems are in DeKalb County, Missouri?
EPA's SDWIS records file 6 active public water systems under DeKalb County, Missouri: 6 community systems (100%). At least 3 more systems are listed under another county but also serve DeKalb County.
Who supplies drinking water in DeKalb County, MO?
The largest community water systems filed under DeKalb County are Dekalb County Pwsd 1 (7,635 people served), Maysville Pws (1,096 people served) and Mo American Stewartsville (928 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 DeKalb County's drinking water come from groundwater or surface water?
Of the 6 active public water systems in DeKalb County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Dekalb County Pwsd 1, uses purchased groundwater.
Where can I find a water quality report for DeKalb 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. 6 community systems are filed under DeKalb 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 DeKalb 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 Missouri 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 DeKalb County, Missouri”, https://aquacensus.com/water-systems/missouri/dekalb (data as of October 1, 2026).