Cass County, Iowa — public water systems
At a glance
15 active public water systems are filed under Cass County, Iowa in EPA's SDWIS records, together reporting 10,975 people served. The largest is Atlantic Municipal Utilities, which reports serving 7,252 people. 7 are community water systems serving people where they live; the other 8 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
15
Population served
11K
Community systems
7
Groundwater share
100%
How does Cass County compare with other Iowa counties?
Cass County has the 42nd-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 10,975 people served in total, the 60th-largest county figure in the state and 0.3% of the statewide total. The average system here reports serving 732 people, about 57% 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 Cass County's drinking water come from?
By primary water source, Cass County's active systems draw on groundwater (15, 100%). 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, Atlantic Municipal Utilities, draws primarily on groundwater.
What kinds of water systems operate in Cass County?
Cass County's active systems break down as 7 community systems (47%), 2 non-transient non-community systems (13%) and 6 transient non-community systems (40%). 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 (53%), private (33%), public/private partnership (6.7%) and state government (6.7%).
Water systems in Cass County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Atlantic Municipal Utilities | Cass | 7,252 | Community | Groundwater |
| 2 | Griswold Water Supply | Cass | 1,008 | Community | Groundwater |
| 3 | Anita Municipal Utilities | Cass | 972 | Community | Groundwater |
| 4 | Massena Water Supply | Cass | 364 | Community | Groundwater |
| 5 | Lewis Water Supply | Cass | 357 | Community | Groundwater |
| 6 | Cumberland Water Supply | Cass | 266 | Community | Groundwater |
| 7 | Hitchcock House | Cass | 216 | Transient non-community | Groundwater |
| 8 | Bluebird Hill | Cass | 150 | Transient non-community | Groundwater |
| 9 | Wiota Water Works | Cass | 95 | Community | Groundwater |
| 10 | Church of Jesus Christ of LDS (Atlantic) | Cass | 80 | Transient non-community | Groundwater |
| 11 | Cocklin Fish Farm | Cass | 65 | Transient non-community | Groundwater |
| 12 | Vermeer (Griswold) | Cass | 52 | Non-transient non-community | Groundwater |
| 13 | Griswold Golf and Country Club | Cass | 43 | Transient non-community | Groundwater |
| 14 | Northwoods Resort | Cass | 30 | Transient non-community | Groundwater |
| 15 | Atlantic Head Start | Cass | 25 | Non-transient non-community | Groundwater |
Cass County water systems: frequently asked questions
How many public water systems are in Cass County, Iowa?
EPA's SDWIS records file 15 active public water systems under Cass County, Iowa: 7 community systems (47%), 2 non-transient non-community systems (13%) and 6 transient non-community systems (40%).
Who supplies drinking water in Cass County, IA?
The largest community water systems filed under Cass County are Atlantic Municipal Utilities (7,252 people served), Griswold Water Supply (1,008 people served) and Anita Municipal Utilities (972 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 Cass County's drinking water come from groundwater or surface water?
Of the 15 active public water systems in Cass County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Atlantic Municipal Utilities, uses groundwater.
Where can I find a water quality report for Cass 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. 7 community systems are filed under Cass 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 Cass 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 Cass County, Iowa”, https://aquacensus.com/water-systems/iowa/cass (data as of October 1, 2026).