Hamilton County, Iowa — public water systems
At a glance
13 active public water systems are filed under Hamilton County, Iowa in EPA's SDWIS records, together reporting 14,289 people served. The largest is Webster City Water Supply, which reports serving 7,825 people. 8 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
13
Population served
14.3K
Community systems
8
Groundwater share
100%
How does Hamilton County compare with other Iowa counties?
Hamilton County has the 51st-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 14,289 people served in total, the 45th-largest county figure in the state and 0.5% of the statewide total. The average system here reports serving 1,099 people, about 36% 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 Hamilton County's drinking water come from?
By primary water source, Hamilton County's active systems draw on groundwater (13, 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, Webster City Water Supply, draws primarily on groundwater.
What kinds of water systems operate in Hamilton County?
Hamilton County's active systems break down as 8 community systems (62%), 1 non-transient non-community systems (7.7%) and 4 transient non-community systems (31%). 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 (62%) and private (38%).
Water systems in Hamilton County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Webster City Water Supply | Hamilton | 7,825 | Community | Groundwater |
| 2 | Flying J No 572 | Hamilton | 1,892 | Non-transient non-community | Groundwater |
| 3 | Jewell Water Supply | Hamilton | 1,216 | Community | Groundwater |
| 4 | Stratford Muni Water Dept | Hamilton | 707 | Community | Groundwater |
| 5 | Williams Travel Center | Hamilton | 610 | Transient non-community | Groundwater |
| 6 | Ellsworth Public Water Supply | Hamilton | 514 | Community | Groundwater |
| 7 | Stanhope Water Department | Hamilton | 364 | Community | Groundwater |
| 8 | Riverside Lutheran Bible Camp | Hamilton | 320 | Transient non-community | Groundwater |
| 9 | Williams Water Supply | Hamilton | 315 | Community | Groundwater |
| 10 | Blairsburg Water Supply | Hamilton | 177 | Community | Groundwater |
| 11 | Community Church of Kamrar | Hamilton | 167 | Transient non-community | Groundwater |
| 12 | Randall Water Supply | Hamilton | 154 | Community | Groundwater |
| 13 | Super 8 Williams | Hamilton | 28 | Transient non-community | Groundwater |
Also serving Hamilton County
These systems serve several counties, including Hamilton County. EPA lists another county first for them, so they are not included in the counts above.
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Xenia Rwd (North) | Webster + 3 more | 6,122 | Community | Groundwater |
Hamilton County water systems: frequently asked questions
How many public water systems are in Hamilton County, Iowa?
EPA's SDWIS records file 13 active public water systems under Hamilton County, Iowa: 8 community systems (62%), 1 non-transient non-community systems (7.7%) and 4 transient non-community systems (31%). At least 1 more system is listed under another county but also serve Hamilton County.
Who supplies drinking water in Hamilton County, IA?
The largest community water systems filed under Hamilton County are Webster City Water Supply (7,825 people served), Jewell Water Supply (1,216 people served) and Stratford Muni Water Dept (707 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 Hamilton County's drinking water come from groundwater or surface water?
Of the 13 active public water systems in Hamilton County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Webster City Water Supply, uses groundwater.
Where can I find a water quality report for Hamilton 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 Hamilton 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 Hamilton 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 Hamilton County, Iowa”, https://aquacensus.com/water-systems/iowa/hamilton (data as of October 1, 2026).