Poweshiek County, Iowa — public water systems
At a glance
8 active public water systems are filed under Poweshiek County, Iowa in EPA's SDWIS records, together reporting 15,352 people served. The largest is Grinnell Water Department, which reports serving 9,564 people. All 8 are community water systems serving people where they live.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
8
Population served
15.4K
Community systems
8
Groundwater share
100%
How does Poweshiek County compare with other Iowa counties?
Poweshiek County has the 74th-most active public water systems among the 114 counties listed for active Iowa systems in EPA records; among the 96 with 3 or more systems, the median has 14. Its systems report 15,352 people served in total, the 40th-largest county figure in the state and 0.5% of the statewide total. The average system here reports serving 1,919 people, about 12% above the Iowa average of 1,718. 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 Poweshiek County's drinking water come from?
By primary water source, Poweshiek County's active systems draw on purchased groundwater (6, 75%) and groundwater (2, 25%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 92% and 7.8% across Iowa. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. The county's largest system, Grinnell Water Department, draws primarily on groundwater.
What kinds of water systems operate in Poweshiek County?
Poweshiek County's active systems break down as 8 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 (75%) and private (25%).
Water systems in Poweshiek County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Grinnell Water Department | Poweshiek | 9,564 | Community | Groundwater |
| 2 | Ponderosa Utilities Inc.. | Poweshiek | 1,750 | Community | Purchased groundwater |
| 3 | Montezuma Muni Water Supply | Poweshiek | 1,545 | Community | Groundwater |
| 4 | Brooklyn Water Department | Poweshiek | 1,505 | Community | Purchased groundwater |
| 5 | Grinnell MHP Mhc | Poweshiek | 313 | Community | Purchased groundwater |
| 6 | Malcom Water Supply | Poweshiek | 270 | Community | Purchased groundwater |
| 7 | Deep River Water Supply | Poweshiek | 249 | Community | Purchased groundwater |
| 8 | Barnes City Water Supply | Poweshiek | 156 | Community | Purchased groundwater |
Poweshiek County water systems: frequently asked questions
How many public water systems are in Poweshiek County, Iowa?
EPA's SDWIS records file 8 active public water systems under Poweshiek County, Iowa: 8 community systems (100%).
Who supplies drinking water in Poweshiek County, IA?
The largest community water systems filed under Poweshiek County are Grinnell Water Department (9,564 people served), Ponderosa Utilities Inc.. (1,750 people served) and Montezuma Muni Water Supply (1,545 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 Poweshiek County's drinking water come from groundwater or surface water?
Of the 8 active public water systems in Poweshiek County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Grinnell Water Department, uses groundwater.
Where can I find a water quality report for Poweshiek 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. 8 community systems are filed under Poweshiek 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 Poweshiek 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 Iowa 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 Poweshiek County, Iowa”, https://aquacensus.com/water-systems/iowa/poweshiek (data as of October 1, 2026).