Public water system record
Hannibal PWS
Serves Hannibal, Marion County, MO · 17,108 people served
Federal records show 2 health-based violations and 8 monitoring/reporting issues for Hannibal PWS in the last ten years. The most serious issue in this window was a Revised Total Coliform Rule violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 2
- Resolved
- 1
- Unresolved
- 0
- Archived by EPA
- 1
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 8
Key facts
- Hannibal PWS draws water from 1 surface water intake and 1 reservoir.
- Most recent enforcement action: boil water order by Missouri, August 2023.
- Record on file since 1983, with 24 health-based violations before October 19, 2016.
- Lead pipe inventory: 5,776 lead and 1,956 unknown out of 11,292 service lines.
Check whether Hannibal PWS serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Revised Total Coliform Rule
Contaminant limit exceeded
|
110 | Aug 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment technique failure
|
120 | Oct 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Jul 2, 2025 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Mar 1, 2018 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2018 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jan 1, 2018 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Dec 1, 2017 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Nov 1, 2017 | Resolved |
|
Long Term 2 Enhanced Surface Water Treatment Rule
OTHER
|
Nov 1, 2016 | Resolved |
|
Long Term 2 Enhanced Surface Water Treatment Rule
OTHER
|
Oct 1, 2016 | Resolved |
Full record since 1983
EPA's records for Hannibal PWS go back to 1983. Before October 19, 2016 they list 24 health-based violations (17 resolved, 7 archived by EPA without a recorded fix) and 35 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 7 | 32 |
| 2000s | 1 | 0 |
| 2010 to October 18, 2016 | 16 | 3 |
| October 19, 2016 to 2019 | 0 | 6 |
| 2020s | 1 | 1 |
Most recent health-based violation before October 19, 2016: Long Term 2 Enhanced Surface Water Treatment Rule, began October 2016, Resolved.
Show all 24 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2016 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 96.9 µg/L, federal limit 80 µg/L (1.2 times the limit)
|
Jul 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 113.78 µg/L, federal limit 80 µg/L (1.4 times the limit)
|
Apr 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 121.72 µg/L, federal limit 80 µg/L (1.5 times the limit)
|
Jan 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 129.61 µg/L, federal limit 80 µg/L (1.6 times the limit)
|
Oct 1, 2014 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 128 µg/L, federal limit 80 µg/L (1.6 times the limit)
|
Jul 1, 2014 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 86.07 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
Jul 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 102.42 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
Apr 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 107.11 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
Jan 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 109.97 µg/L, federal limit 80 µg/L (1.4 times the limit)
|
Oct 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 101.49 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
Jul 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 101.62 µg/L, federal limit 80 µg/L (1.3 times the limit)
|
Apr 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 95.54 µg/L, federal limit 80 µg/L (1.2 times the limit)
|
Jan 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90.68 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
Oct 1, 2011 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90.63 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
Jul 1, 2011 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2003 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Apr 1, 1985 | Archived |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Apr 1, 1985 | Archived |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jan 1, 1985 | Archived |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jan 1, 1985 | Archived |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Oct 1, 1984 | Archived |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Oct 1, 1984 | Archived |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
|
Jan 1, 1983 | Archived |
Enforcement actions
Missouri regulators took 1 formal enforcement action against Hannibal PWS and issued 1 boil water order between 2013 and 2023. The most recent was a boil water order in August 2023.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Aug 14, 2023 | Missouri | Boil water order | 1 violation (1 health-based): Revised Total Coliform Rule |
| Jun 8, 2013 | Missouri | Compliance order with a penalty | 14 violations (13 health-based): Total Trihalomethanes (TTHMs), Public Notice |
What the violations mean
Revised Total Coliform Rule
1 incidentThe system did not meet a requirement of the Revised Total Coliform Rule
Coliform and E. coli rules protect against bacteria in the distribution system
Long Term 2 Enhanced Surface Water Treatment Rule
1 incidentThe system failed required surface water treatment or filtration standards
Untreated or inadequately treated surface water can contain bacteria and viruses
Where the water comes from
Hannibal PWS draws water from 1 surface water intake and 1 reservoir. 1 other public water system has an emergency connection to Hannibal PWS.
Annual water quality report
Hannibal PWS must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Missouri.
Certified drinking water labs by state EPA guidance for private wells