Calhoun County, Iowa — public water systems
At a glance
14 active public water systems are filed under Calhoun County, Iowa in EPA's SDWIS records, together reporting 8,014 people served. The largest is Rockwell City Water Supply, which reports serving 2,250 people. 12 are community water systems serving people where they live; the other 2 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
14
Population served
8K
Community systems
12
Groundwater share
100%
How does Calhoun County compare with other Iowa counties?
Calhoun County has the 44th-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 8,014 people served in total, the 75th-largest county figure in the state and 0.3% of the statewide total. The average system here reports serving 572 people, well below 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 Calhoun County's drinking water come from?
By primary water source, Calhoun County's active systems draw on groundwater (13, 93%) and purchased groundwater (1, 7.1%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 92% and 7.8% across Iowa. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Rockwell City Water Supply, draws primarily on groundwater.
What kinds of water systems operate in Calhoun County?
Calhoun County's active systems break down as 12 community systems (86%), 1 non-transient non-community systems (7.1%) and 1 transient non-community systems (7.1%). 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 local government (86%) and private (14%).
Water systems in Calhoun County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Rockwell City Water Supply | Calhoun | 2,250 | Community | Groundwater |
| 2 | Lake City Water Supply | Calhoun | 1,731 | Community | Groundwater |
| 3 | Manson Water Supply | Calhoun | 1,709 | Community | Groundwater |
| 4 | Pomeroy Water Supply | Calhoun | 671 | Community | Groundwater |
| 5 | Lohrville Water Supply | Calhoun | 381 | Community | Groundwater |
| 6 | Farnhamville Water Supply | Calhoun | 379 | Community | Groundwater |
| 7 | Twin Lakes Utilities | Calhoun | 300 | Community | Purchased groundwater |
| 8 | Lytton Water Department | Calhoun | 282 | Community | Groundwater |
| 9 | Somers Water Works | Calhoun | 128 | Community | Groundwater |
| 10 | Knierim Water Supply | Calhoun | 53 | Community | Groundwater |
| 11 | Twin Lakes Golf Club | Calhoun | 39 | Transient non-community | Groundwater |
| 12 | Rinard Water Supply | Calhoun | 38 | Community | Groundwater |
| 13 | Jolley Water Supply | Calhoun | 28 | Community | Groundwater |
| 14 | Yetter Municipal Water Supply | Calhoun | 25 | Non-transient non-community | Groundwater |
Calhoun County water systems: frequently asked questions
How many public water systems are in Calhoun County, Iowa?
EPA's SDWIS records file 14 active public water systems under Calhoun County, Iowa: 12 community systems (86%), 1 non-transient non-community systems (7.1%) and 1 transient non-community systems (7.1%).
Who supplies drinking water in Calhoun County, IA?
The largest community water systems filed under Calhoun County are Rockwell City Water Supply (2,250 people served), Lake City Water Supply (1,731 people served) and Manson Water Supply (1,709 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 Calhoun County's drinking water come from groundwater or surface water?
Of the 14 active public water systems in Calhoun County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Rockwell City Water Supply, uses groundwater.
Where can I find a water quality report for Calhoun 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. 12 community systems are filed under Calhoun 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 Calhoun 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 Calhoun County, Iowa”, https://aquacensus.com/water-systems/iowa/calhoun (data as of October 1, 2026).