Marion County, Missouri — public water systems
At a glance
4 active public water systems are filed under Marion County, Missouri in EPA's SDWIS records, together reporting 25,655 people served. The largest is Hannibal Pws, which reports serving 17,108 people. 3 are community water systems serving people where they live; the other 1 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
4
Population served
25.7K
Community systems
3
Groundwater share
50%
How does Marion County compare with other Missouri counties?
Marion County has the 111th-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 25,655 people served in total, the 37th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 6,414 people, about 3.1 times 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 Marion County's drinking water come from?
By primary water source, Marion County's active systems draw on groundwater (2, 50%), surface water (1, 25%) and purchased surface water (1, 25%). Overall, 50% rely mainly on groundwater (including purchased groundwater) and 50% on surface water, compared with 92% and 8.1% across Missouri. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Hannibal Pws, draws primarily on surface water.
What kinds of water systems operate in Marion County?
Marion County's active systems break down as 3 community systems (75%) and 1 transient non-community systems (25%). 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 local government (75%) and private (25%).
Water systems in Marion County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Hannibal Pws | Marion | 17,108 | Community | Surface water |
| 2 | Marion County Pwsd 1 | Marion | 4,900 | Community | Purchased surface water |
| 3 | Palmyra Pws | Marion | 3,595 | Community | Groundwater |
| 4 | Blue Water S Resort, LLC | Marion | 52 | Transient non-community | Groundwater |
Marion County water systems: frequently asked questions
How many public water systems are in Marion County, Missouri?
EPA's SDWIS records file 4 active public water systems under Marion County, Missouri: 3 community systems (75%) and 1 transient non-community systems (25%).
Who supplies drinking water in Marion County, MO?
The largest community water systems filed under Marion County are Hannibal Pws (17,108 people served), Marion County Pwsd 1 (4,900 people served) and Palmyra Pws (3,595 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 Marion County's drinking water come from groundwater or surface water?
Of the 4 active public water systems in Marion County, 50% draw mainly on groundwater and 50% on surface water, counting purchased supplies. The largest system, Hannibal Pws, uses surface water.
Where can I find a water quality report for Marion 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. 3 community systems are filed under Marion 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 Marion 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 Marion County, Missouri”, https://aquacensus.com/water-systems/missouri/marion (data as of October 1, 2026).