Hannibal Water Quality
Missouri
According to EPA SDWIS, Hannibal, Missouri is served by 2 community water systems covering about 24,770 people. The same extract lists 47 health-based violation records, most recently coded 8000 in 2023. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Hannibal, Missouri is delivered through 2 EPA-regulated community water systems serving an estimated 24,770 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 47 violation records across the 2 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 4 distinct EPA contaminant codes: Revised Total Coliform Rule, TTHM, Long Term 2 Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule. 4 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Missouri drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| HANNIBAL PWS | 17,108 | 19 | Health |
| RALLS COUNTY PWSD 1 | 7,662 | 28 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| HANNIBAL PWS | Revised Total Coliform Rule | 2023-08-01 |
| HANNIBAL PWS | Revised Total Coliform Rule | 2023-08-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2023-01-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2023-01-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2023-01-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2023-01-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2023-01-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2023-01-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-10-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-10-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-10-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-10-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-10-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-07-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-07-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-07-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-07-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-07-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-04-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-04-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-04-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2022-04-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2020-10-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2020-10-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2020-07-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2020-07-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2020-04-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2020-04-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2017-01-01 |
| RALLS COUNTY PWSD 1 | TTHM | 2017-01-01 |
| HANNIBAL PWS | Long Term 2 Enhanced Surface Water Treatment Rule | 2016-10-01 |
| HANNIBAL PWS | Surface Water Treatment Rule | 2016-05-01 |
| HANNIBAL PWS | - | 2016-05-01 |
| HANNIBAL PWS | TTHM | 2015-07-01 |
| HANNIBAL PWS | TTHM | 2015-04-01 |
| HANNIBAL PWS | TTHM | 2015-01-01 |
| HANNIBAL PWS | TTHM | 2014-10-01 |
| HANNIBAL PWS | TTHM | 2014-07-01 |
| HANNIBAL PWS | TTHM | 2013-07-01 |
| HANNIBAL PWS | TTHM | 2013-04-01 |
| HANNIBAL PWS | TTHM | 2013-01-01 |
| HANNIBAL PWS | TTHM | 2012-10-01 |
| HANNIBAL PWS | TTHM | 2012-07-01 |
| HANNIBAL PWS | TTHM | 2012-04-01 |
| HANNIBAL PWS | TTHM | 2012-01-01 |
| HANNIBAL PWS | TTHM | 2011-10-01 |
| HANNIBAL PWS | TTHM | 2011-07-01 |
What are Hannibal's health-based records for?
Hannibal's health-based violation records carry 5 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Tthm | 42 | 2 |
| Revised Total Coliform Rule | 2 | 1 |
| EPA code | 1 | 1 |
| Surface Water Treatment Rule | 1 | 1 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 1 | 1 |
TRI Facilities in Hannibal
| Facility | Total Releases |
|---|---|
| Continental Cement Co LLC | 433.1K lbs |
| Enduro Industries LLC | 59.4K lbs |
| Ennis-Flint | 50.8K lbs |
| Watlow Electric Manufacturing Co | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Hannibal, Missouri? ▼
How many water violations does Hannibal have in this EPA extract? ▼
What contaminants were found in Hannibal water? ▼
How many water systems serve Hannibal? ▼
Where does Hannibal get its drinking water? ▼
Are there pollution sources near Hannibal? ▼
How does Hannibal compare in Missouri?
Of the 676 Missouri places with at least one community water system on file, Hannibal ranks #169 by number of systems (2).
Either side of it: Hallsville (2), Hamilton (2), Hermann (2), Higginsville (2)
About This Data
Figures here are the current EPA SDWIS extract joined to the 2 community water systems whose service area lists Hannibal, ranked against the 676 Missouri places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.