Decatur County, Indiana — public water systems
At a glance
17 active public water systems are filed under Decatur County, Indiana in EPA's SDWIS records, together reporting 22,794 people served. The largest is Greensburg Municipal Water Works, which reports serving 12,650 people. 5 are community water systems serving people where they live; the other 12 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
17
Population served
22.8K
Community systems
5
Groundwater share
70.6%
How does Decatur County compare with other Indiana counties?
Decatur County has the 53rd-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 22,794 people served in total, the 59th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 1,341 people, roughly in line with 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 Decatur County's drinking water come from?
By primary water source, Decatur County's active systems draw on groundwater (12, 71%), surface water (3, 18%) and purchased surface water (2, 12%). Overall, 71% rely mainly on groundwater (including purchased groundwater) and 29% 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, Greensburg Municipal Water Works, draws primarily on surface water.
What kinds of water systems operate in Decatur County?
Decatur County's active systems break down as 5 community systems (29%), 1 non-transient non-community systems (5.9%) and 11 transient non-community systems (65%). 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 (65%) and local government (35%).
Water systems in Decatur County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Greensburg Municipal Water Works | Decatur | 12,650 | Community | Surface water |
| 2 | Decatur Co. Water Corp. | Decatur | 3,440 | Community | Purchased surface water |
| 3 | Westport Water Company | Decatur | 1,725 | Community | Surface water |
| 4 | Lake Santee Rwwd | Decatur | 1,500 | Community | Surface water |
| 5 | St. Paul Municipal Water | Decatur | 1,096 | Community | Groundwater |
| 6 | Westport Water Company - Cougar Road | Decatur | 933 | Non-transient non-community | Purchased surface water |
| 7 | Lions Camp Woodsmoke | Decatur | 500 | Transient non-community | Groundwater |
| 8 | Kohler Memorial Park | Decatur | 200 | Transient non-community | Groundwater |
| 9 | Hidden Paradise Camp | Decatur | 175 | Transient non-community | Groundwater |
| 10 | Ymca Flatrock Camp | Decatur | 150 | Transient non-community | Groundwater |
| 11 | Clarksburg Christian Church | Decatur | 87 | Transient non-community | Groundwater |
| 12 | Clarksburg Christian Church - Rec Hall | Decatur | 87 | Transient non-community | Groundwater |
| 13 | Springhill United Presbyterian | Decatur | 70 | Transient non-community | Groundwater |
| 14 | Sardinia Baptist Church | Decatur | 60 | Transient non-community | Groundwater |
| 15 | Clarksburg Covenant Church | Decatur | 53 | Transient non-community | Groundwater |
| 16 | Thorntree Lake MHP & Campground LLC | Decatur | 38 | Transient non-community | Groundwater |
| 17 | Sandusky Methodist Church | Decatur | 30 | Transient non-community | Groundwater |
Decatur County water systems: frequently asked questions
How many public water systems are in Decatur County, Indiana?
EPA's SDWIS records file 17 active public water systems under Decatur County, Indiana: 5 community systems (29%), 1 non-transient non-community systems (5.9%) and 11 transient non-community systems (65%).
Who supplies drinking water in Decatur County, IN?
The largest community water systems filed under Decatur County are Greensburg Municipal Water Works (12,650 people served), Decatur Co. Water Corp. (3,440 people served) and Westport Water Company (1,725 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 Decatur County's drinking water come from groundwater or surface water?
Of the 17 active public water systems in Decatur County, 71% draw mainly on groundwater and 29% on surface water, counting purchased supplies. The largest system, Greensburg Municipal Water Works, uses surface water.
Where can I find a water quality report for Decatur 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. 5 community systems are filed under Decatur 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 Decatur 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
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 Decatur County, Indiana”, https://aquacensus.com/water-systems/indiana/decatur (data as of October 1, 2026).