Posey County, Indiana — public water systems
At a glance
9 active public water systems are filed under Posey County, Indiana in EPA's SDWIS records, together reporting 10,547 people served. The largest is Mount Vernon Water Works, which reports serving 6,426 people. 4 are community water systems serving people where they live; the other 5 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
9
Population served
10.5K
Community systems
4
Groundwater share
77.8%
How does Posey County compare with other Indiana counties?
Posey County has the 74th-most active public water systems among the 109 counties listed for active Indiana systems in EPA records; among the 92 with 3 or more systems, the median has 26. Its systems report 10,547 people served in total, the 83rd-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 1,172 people, about 19% below the Indiana average of 1,456. 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 Posey County's drinking water come from?
By primary water source, Posey County's active systems draw on groundwater (7, 78%), purchased surface water (1, 11%) and surface water (1, 11%). Overall, 78% rely mainly on groundwater (including purchased groundwater) and 22% on surface water, compared with 97% and 2.8% across Indiana. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Mount Vernon Water Works, draws primarily on surface water.
What kinds of water systems operate in Posey County?
Posey County's active systems break down as 4 community systems (44%), 1 non-transient non-community systems (11%) and 4 transient non-community systems (44%). 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 non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. 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 (56%) and local government (44%).
Water systems in Posey County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Mount Vernon Water Works | Posey | 6,426 | Community | Surface water |
| 2 | New Harmony Water Utility | Posey | 1,633 | Community | Groundwater |
| 3 | Poseyville Municipal Water Department | Posey | 1,400 | Community | Groundwater |
| 4 | Cynthiana Water Works | Posey | 699 | Community | Purchased surface water |
| 5 | A.B. Brown Station - Sigeco | Posey | 129 | Non-transient non-community | Groundwater |
| 6 | St. Philips Inn | Posey | 100 | Transient non-community | Groundwater |
| 7 | Mt. Zion General Baptist Church | Posey | 73 | Transient non-community | Groundwater |
| 8 | Depot Diner & Service Station | Posey | 52 | Transient non-community | Groundwater |
| 9 | H&R Agri-Power | Posey | 35 | Transient non-community | Groundwater |
Posey County water systems: frequently asked questions
How many public water systems are in Posey County, Indiana?
EPA's SDWIS records file 9 active public water systems under Posey County, Indiana: 4 community systems (44%), 1 non-transient non-community systems (11%) and 4 transient non-community systems (44%).
Who supplies drinking water in Posey County, IN?
The largest community water systems filed under Posey County are Mount Vernon Water Works (6,426 people served), New Harmony Water Utility (1,633 people served) and Poseyville Municipal Water Department (1,400 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 Posey County's drinking water come from groundwater or surface water?
Of the 9 active public water systems in Posey County, 78% draw mainly on groundwater and 22% on surface water, counting purchased supplies. The largest system, Mount Vernon Water Works, uses surface water.
Where can I find a water quality report for Posey 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. 4 community systems are filed under Posey 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 Posey 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 Indiana water systems
- All Indiana public water systems· 3,969 active
- Jennings County· 10 systems
- Ripley County· 10 systems
- Warrick County· 10 systems
- Jackson County· 9 systems
- Benton County· 8 systems
- Blackford County· 8 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 Posey County, Indiana”, https://aquacensus.com/water-systems/indiana/posey (data as of October 1, 2026).