Public water system · MO2010344

Active

Hannibal Pws

At a glance

Hannibal Pws (PWSID MO2010344) is an active community water system in Marion County, Missouri. It reports serving 17,108 people through 7,348 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

17,108

Service connections

7,348

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDMO2010344

System typeCommunity water system

Activity statusActive

Population served17,108

Service connections7,348

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyMO state drinking water program

City servedHannibal

StateMissouri

ZIP—

CountyMarion County

How does Hannibal Pws compare with other water systems in Marion County?

By EPA's size categories, Hannibal Pws is a large system (10,001 to 100,000 people). Marion County has 4 active public water systems, and Hannibal Pws is the largest of them by population served. Its population served is about 167% above the county average of 6,414 people per system, and accounts for 67% of the 25,655 people reported by systems filed under the county. Across Missouri, the 2,943 active systems average 2,049 people each. Nationally, the average active community water system reports serving 6,703 people, so Hannibal Pws is about 155% above that figure.

What does “community water system” mean?

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. Missouri has 1,612 active community water systems, 55% of the state's 2,943 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 60 Missouri systems (2%) list surface water as their primary source.

Who owns and regulates Hannibal Pws?

EPA lists Hannibal Pws as owned by a local government. The MO state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 3 of the 4 active systems in Marion County (75%) are also owned by a local government.

Does Hannibal Pws have drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2025. The violations listed here began between April 2016 and July 2025. By type: 5 monitoring, 2 public notice, recordkeeping or other, 2 required treatment not met, 1 reporting, 1 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Revised Total Coliform Rule (6 of them). EPA lists 10 as resolved, 1 as unaddressed and 1 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2025-07-02	ReportingNotification, Known or Potential LSL · code 4H	Lead and Copper Rule Revisionscode 5200	No	Unaddressed
2023-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A	Revised Total Coliform Rulecode 8000	Yes	Archived
2018-03-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2018-02-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2018-01-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-12-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-11-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2016-11-01	Public notice, recordkeeping or otherRecord Keeping · code 09	Long Term 2 Enhanced Surface Water Treatment Rulecode 0800	No	Resolved
2016-10-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Long Term 2 Enhanced Surface Water Treatment Rulecode 0800	Yes	Resolved
2016-10-01	Public notice, recordkeeping or otherRecord Keeping · code 09	Long Term 2 Enhanced Surface Water Treatment Rulecode 0800	No	Resolved
2016-05-01	Required treatment not metTreatment Technique (SWTR and GWR) · code 41	Surface Water Treatment Rulecode 0200	Yes	Resolved
2016-04-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Long Term 2 Enhanced Surface Water Treatment Rulecode 0800	No	Resolved

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Hannibal Pws: frequently asked questions

Who runs Hannibal Pws?

Hannibal Pws (PWSID MO2010344) is a community water system owned by a local government. It is regulated by the MO state drinking water program.

How many people does Hannibal Pws serve?

Hannibal Pws reports serving 17,108 people through 7,348 service connections in Marion County, Missouri.

Where does Hannibal Pws get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does Hannibal Pws have any drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Hannibal Pws' water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MO state drinking water program.

Where can I find Hannibal Pws' water quality report?

As a community water system, Hannibal Pws must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in Marion County

Water system	County	Population served	Type	Source
Marion County Pwsd 1	Marion	4,900	Community	Purchased surface water
Palmyra Pws	Marion	3,595	Community	Groundwater
Blue Water S Resort, LLC	Marion	52	Transient non-community	Groundwater

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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, “Hannibal Pws, PWSID MO2010344, Missouri”, https://aquacensus.com/water-systems/missouri/hannibal-pws-mo2010344 (data as of October 1, 2026).