Jefferson County, Iowa — public water systems
At a glance
8 active public water systems are filed under Jefferson County, Iowa in EPA's SDWIS records, together reporting 11,535 people served. The largest is Fairfield Water Supply, which reports serving 9,821 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
11.5K
Community systems
8
Groundwater share
75%
How does Jefferson County compare with other Iowa counties?
Jefferson County has the 73rd-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 11,535 people served in total, the 57th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 1,442 people, about 16% 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 Jefferson County's drinking water come from?
By primary water source, Jefferson County's active systems draw on purchased groundwater (5, 63%), purchased surface water (2, 25%) and groundwater (1, 13%). Overall, 75% rely mainly on groundwater (including purchased groundwater) and 25% 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, Fairfield Water Supply, draws primarily on groundwater.
What kinds of water systems operate in Jefferson County?
Jefferson 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 (63%) and private (38%).
Water systems in Jefferson County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Fairfield Water Supply | Jefferson | 9,821 | Community | Groundwater |
| 2 | Jefferson County Rural Water District | Jefferson | 468 | Community | Purchased surface water |
| 3 | Batavia Water Works | Jefferson | 430 | Community | Purchased surface water |
| 4 | Libertyville Water Works | Jefferson | 304 | Community | Purchased groundwater |
| 5 | Lockridge Muni Water Supply | Jefferson | 244 | Community | Purchased groundwater |
| 6 | Fairfield Estates Mobile Home Park | Jefferson | 140 | Community | Purchased groundwater |
| 7 | Ila Campus LLC | Jefferson | 68 | Community | Purchased groundwater |
| 8 | Maharishi Vedic City Water Supply | Jefferson | 60 | Community | Purchased groundwater |
Also serving Jefferson County
These systems serve several counties, including Jefferson County. EPA lists another county first for them, so they are not included in the counts above.
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Rathbun Regional Water Assn (Rathbun) | Decatur + 7 more | 33,000 | Community | Surface water |
| Wapello Rural Water Assoc. | Keokuk + 3 more | 17,263 | Community | Purchased surface water |
Jefferson County water systems: frequently asked questions
How many public water systems are in Jefferson County, Iowa?
EPA's SDWIS records file 8 active public water systems under Jefferson County, Iowa: 8 community systems (100%). At least 2 more systems are listed under another county but also serve Jefferson County.
Who supplies drinking water in Jefferson County, IA?
The largest community water systems filed under Jefferson County are Fairfield Water Supply (9,821 people served), Jefferson County Rural Water District (468 people served) and Batavia Water Works (430 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 Jefferson County's drinking water come from groundwater or surface water?
Of the 8 active public water systems in Jefferson County, 75% draw mainly on groundwater and 25% on surface water, counting purchased supplies. The largest system, Fairfield Water Supply, uses groundwater.
Where can I find a water quality report for Jefferson 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 Jefferson 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 Jefferson 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 Jefferson County, Iowa”, https://aquacensus.com/water-systems/iowa/jefferson (data as of October 1, 2026).