Delaware County, Iowa — public water systems
At a glance
28 active public water systems are filed under Delaware County, Iowa in EPA's SDWIS records, together reporting 9,400 people served. The largest is Manchester Water Supply, which reports serving 5,077 people. 8 are community water systems serving people where they live; the other 20 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
28
Population served
9.4K
Community systems
8
Groundwater share
100%
How does Delaware County compare with other Iowa counties?
Delaware County has the 17th-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 9,400 people served in total, the 68th-largest county figure in the state and 0.3% of the statewide total. The average system here reports serving 336 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 Delaware County's drinking water come from?
By primary water source, Delaware County's active systems draw on groundwater (28, 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, Manchester Water Supply, draws primarily on groundwater.
What kinds of water systems operate in Delaware County?
Delaware County's active systems break down as 8 community systems (29%), 2 non-transient non-community systems (7.1%) and 18 transient non-community systems (64%). 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 private (57%), local government (36%) and state government (7.1%).
Water systems in Delaware County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Manchester Water Supply | Delaware | 5,077 | Community | Groundwater |
| 2 | Earlville Muni Water Supply | Delaware | 724 | Community | Groundwater |
| 3 | Hopkinton Municipal Utilities | Delaware | 622 | Community | Groundwater |
| 4 | Backbone State Park | Delaware | 508 | Transient non-community | Groundwater |
| 5 | Delhi Water Supply | Delaware | 420 | Community | Groundwater |
| 6 | Colesburg Water Supply | Delaware | 386 | Community | Groundwater |
| 7 | Ryan Water Supply | Delaware | 350 | Community | Groundwater |
| 8 | Hart Ridge Golf Course | Delaware | 167 | Transient non-community | Groundwater |
| 9 | Delaware Municipal Water Supply | Delaware | 142 | Community | Groundwater |
| 10 | Hartwick Point Well | Delaware | 120 | Transient non-community | Groundwater |
| 11 | Pin Oak Pub & Links | Delaware | 100 | Transient non-community | Groundwater |
| 12 | Penn Center Inc. | Delaware | 89 | Community | Groundwater |
| 13 | Backbone Golf and Country Club | Delaware | 64 | Transient non-community | Groundwater |
| 14 | Twin Bridges Park - Delaware C.C.B. | Delaware | 61 | Transient non-community | Groundwater |
| 15 | Eip Manufacturing, LLC | Delaware | 60 | Non-transient non-community | Groundwater |
| 16 | Clair-View Acres Waterworks LLC | Delaware | 56 | Transient non-community | Groundwater |
| 17 | Baileys Ford Park - Delaware Ccb | Delaware | 55 | Transient non-community | Groundwater |
| 18 | Rocky Nook Association, Inc.. | Delaware | 50 | Transient non-community | Groundwater |
| 19 | Lost Beach Resort | Delaware | 50 | Transient non-community | Groundwater |
| 20 | Big River United Energy LLC | Delaware | 50 | Non-transient non-community | Groundwater |
| 21 | Manchester Fish Hatchery | Delaware | 43 | Transient non-community | Groundwater |
| 22 | Dollar General (Earlville) | Delaware | 40 | Transient non-community | Groundwater |
| 23 | Delhi Lakeview Estates | Delaware | 35 | Transient non-community | Groundwater |
| 24 | Tri-State Raceway | Delaware | 27 | Transient non-community | Groundwater |
| 25 | Turtle Creek Park - Delaware C.C.B. | Delaware | 27 | Transient non-community | Groundwater |
| 26 | Big House | Delaware | 27 | Transient non-community | Groundwater |
| 27 | R Place | Delaware | 25 | Transient non-community | Groundwater |
| 28 | Lazy T Campground | Delaware | 25 | Transient non-community | Groundwater |
Delaware County water systems: frequently asked questions
How many public water systems are in Delaware County, Iowa?
EPA's SDWIS records file 28 active public water systems under Delaware County, Iowa: 8 community systems (29%), 2 non-transient non-community systems (7.1%) and 18 transient non-community systems (64%).
Who supplies drinking water in Delaware County, IA?
The largest community water systems filed under Delaware County are Manchester Water Supply (5,077 people served), Earlville Muni Water Supply (724 people served) and Hopkinton Municipal Utilities (622 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 Delaware County's drinking water come from groundwater or surface water?
Of the 28 active public water systems in Delaware County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Manchester Water Supply, uses groundwater.
Where can I find a water quality report for Delaware 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 Delaware 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 Delaware 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 Delaware County, Iowa”, https://aquacensus.com/water-systems/iowa/delaware (data as of October 1, 2026).