Caldwell County, Missouri — public water systems
At a glance
8 active public water systems are filed under Caldwell County, Missouri in EPA's SDWIS records, together reporting 6,371 people served. The largest is Hamilton Pws, which reports serving 1,813 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
6.4K
Community systems
8
Groundwater share
62.5%
How does Caldwell County compare with other Missouri counties?
Caldwell County has the 80th-most active public water systems among the 182 counties listed for active Missouri systems in EPA records; among the 132 with 3 or more systems, the median has 13. Its systems report 6,371 people served in total, the 95th-largest county figure in the state and 0.1% of the statewide total. The average system here reports serving 796 people, about 61% below the Missouri average of 2,049. 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 Caldwell County's drinking water come from?
By primary water source, Caldwell County's active systems draw on groundwater (3, 38%), purchased groundwater (2, 25%), purchased surface water (2, 25%) and surface water (1, 13%). Overall, 63% rely mainly on groundwater (including purchased groundwater) and 38% on surface water, compared with 92% and 8.1% across Missouri. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Hamilton Pws, draws primarily on surface water.
What kinds of water systems operate in Caldwell County?
Caldwell 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 (100%).
Water systems in Caldwell County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Hamilton Pws | Caldwell | 1,813 | Community | Surface water |
| 2 | Caldwell County Pwsd 3 | Caldwell | 1,452 | Community | Purchased surface water |
| 3 | Braymer Pws | Caldwell | 878 | Community | Groundwater |
| 4 | Caldwell County Pwsd 2 | Caldwell | 695 | Community | Purchased surface water |
| 5 | Polo Pws | Caldwell | 575 | Community | Purchased groundwater |
| 6 | Caldwell County Pwsd 1 | Caldwell | 335 | Community | Groundwater |
| 7 | Breckenridge Pws | Caldwell | 333 | Community | Purchased groundwater |
| 8 | Kingston Pws | Caldwell | 290 | Community | Groundwater |
Also serving Caldwell County
These systems serve several counties, including Caldwell County. EPA lists another county first for them, so they are not included in the counts above.
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ray County Cons Pwsd 2 | Clay + 2 more | 9,360 | Community | Groundwater |
| Clinton County Pwsd 3 | Daviess + 3 more | 3,722 | Community | Purchased surface water |
| Great Northwest Wholesale Water Commiss | Atchison + 10 more | 25 | Community | Purchased groundwater |
Caldwell County water systems: frequently asked questions
How many public water systems are in Caldwell County, Missouri?
EPA's SDWIS records file 8 active public water systems under Caldwell County, Missouri: 8 community systems (100%). At least 3 more systems are listed under another county but also serve Caldwell County.
Who supplies drinking water in Caldwell County, MO?
The largest community water systems filed under Caldwell County are Hamilton Pws (1,813 people served), Caldwell County Pwsd 3 (1,452 people served) and Braymer Pws (878 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 Caldwell County's drinking water come from groundwater or surface water?
Of the 8 active public water systems in Caldwell County, 63% draw mainly on groundwater and 38% on surface water, counting purchased supplies. The largest system, Hamilton Pws, uses surface water.
Where can I find a water quality report for Caldwell 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 Caldwell 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 Caldwell 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 Missouri 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 Caldwell County, Missouri”, https://aquacensus.com/water-systems/missouri/caldwell (data as of October 1, 2026).