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Warren County, Missouri — public water systems

At a glance

27 active public water systems are filed under Warren County, Missouri in EPA's SDWIS records, together reporting 20,217 people served. The largest is Warrenton Pws, which reports serving 8,208 people. 16 are community water systems serving people where they live; the other 11 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

27

Population served

20.2K

Community systems

16

Groundwater share

100%

How does Warren County compare with other Missouri counties?

Warren County has the 32nd-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 20,217 people served in total, the 46th-largest county figure in the state and 0.3% of the statewide total. The average system here reports serving 749 people, about 63% 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 Warren County's drinking water come from?

By primary water source, Warren County's active systems draw on groundwater (27, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none 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, Warrenton Pws, draws primarily on groundwater.

What kinds of water systems operate in Warren County?

Warren County's active systems break down as 16 community systems (59%), 4 non-transient non-community systems (15%) and 7 transient non-community systems (26%). 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 (67%) and local government (33%).

Water systems in Warren County

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Active public water systems in Warren County, Missouri
#Water systemCountyPopulation servedTypeSource
1Warrenton PwsWarren8,208CommunityGroundwater
2St Charles Co Pwsd #2 Wright CityWarren3,550CommunityGroundwater
3Marthasville PwsWarren1,200CommunityGroundwater
4St Charles County Pwsd 2 WarrenWarren1,192CommunityGroundwater
5American Foods GroupWarren1,100Non-transient non-communityGroundwater
6Lake Sherwood SubdWarren1,100CommunityGroundwater
7Truesdale PwsWarren853CommunityGroundwater
8InnsbrookWarren810CommunityGroundwater
9St Charles County Pwsd 2 North Oak DrWarren660CommunityGroundwater
10St Charles County Pwsd 2 DutzowWarren400CommunityGroundwater
11Dogwood Lake CampgroundWarren200Transient non-communityGroundwater
12Pleasant Oak MHPWarren150CommunityGroundwater
13Maple Ridge MHPWarren140CommunityGroundwater
14Glenbrook EstatesWarren100CommunityGroundwater
15Treloar Bar and GrillWarren75Transient non-communityGroundwater
16Cedar Grove Village SubdWarren60CommunityGroundwater
17St Ignatius Loyola SchoolWarren60Non-transient non-communityGroundwater
18Country CoveWarren52CommunityGroundwater
19Cedar Lake CellarsWarren50Transient non-communityGroundwater
20TemcoWarren50Non-transient non-communityGroundwater
21Valley Lake EstatesWarren40CommunityGroundwater
22Warco Mfg CoWarren32Non-transient non-communityGroundwater
23Great Oak SubdivisionWarren30CommunityGroundwater
24Blumenhof WineryWarren30Transient non-communityGroundwater
25Garage BarWarren25Transient non-communityGroundwater
26Washington AirportWarren25Transient non-communityGroundwater
27Lake Creek Farm WineryWarren25Transient non-communityGroundwater

Also serving Warren County

These systems serve several counties, including Warren County. EPA lists another county first for them, so they are not included in the counts above.

Multi-county water systems that also serve Warren County, Missouri
Water systemCountyPopulation servedTypeSource
Montgomery Co Pwsd 1Montgomery + 1 more3,850CommunityGroundwater
Mo American Warren County Water & SewerLincoln + 1 more1,200CommunityGroundwater

Warren County water systems: frequently asked questions

How many public water systems are in Warren County, Missouri?

EPA's SDWIS records file 27 active public water systems under Warren County, Missouri: 16 community systems (59%), 4 non-transient non-community systems (15%) and 7 transient non-community systems (26%). At least 2 more systems are listed under another county but also serve Warren County.

Who supplies drinking water in Warren County, MO?

The largest community water systems filed under Warren County are Warrenton Pws (8,208 people served), St Charles Co Pwsd #2 Wright City (3,550 people served) and Marthasville Pws (1,200 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 Warren County's drinking water come from groundwater or surface water?

Of the 27 active public water systems in Warren County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, Warrenton Pws, uses groundwater.

Where can I find a water quality report for Warren 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. 16 community systems are filed under Warren 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 Warren 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 Warren County, Missouri”, https://aquacensus.com/water-systems/missouri/warren (data as of October 1, 2026).