Community Water System · PWS MO2010344
Hannibal PWS
Operator location Hannibal, Missouri - 54% of 178 violations are health-based (upper-third health share (> 23%)); surface water source; 17,108 served per SDWIS.
- 17,108
- People served (this PWS)
- 178
- EPA violations (this PWS)
- 96
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
Hannibal PWS standing, high SDWIS violation third
54% of 178 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 54% is upper-third health share (> 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #3,088 of 29,740 among systems serving 500+.
The verdict
Hannibal PWS sits in the upper third of the sitemap cohort by violation count (178), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (17,108; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 54% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #3,088 of 29,740
- Population · /systems
- #36 of 738
- Population · MO
- 178
- Total EPA violations on record
- 54%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 7,348
- County
- Marion
- School/Daycare
- No
- MCL Violations
- 87
- Monitoring Violations
- 72
- Treatment Tech Violations
- 9
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 81 | 2015 |
| Revised Total Coliform Rule | MON | 20 | 2018 |
| Surface Water Treatment Rule | TT | 8 | 2016 |
| Benzene | MR | 6 | 1988 |
| Trichloroethylene | MR | 6 | 1988 |
| Carbon tetrachloride | MR | 6 | 1988 |
| 1,1,1-Trichloroethane | MR | 6 | 1988 |
| 1,2-Dichloroethane | MR | 6 | 1988 |
| 1,1-Dichloroethylene | MR | 6 | 1988 |
| Vinyl chloride | MR | 6 | 1988 |
| p-Dichlorobenzene | MR | 6 | 1988 |
| Revised Total Coliform Rule | MCL | 6 | 2023 |
| Long Term 2 Enhanced Surface Water Treatment Rule | MR | 4 | 2016 |
| Public Notice | Other | 2 | 2013 |
| Long Term 2 Enhanced Surface Water Treatment Rule | Other | 2 | 2016 |
| Long Term 2 Enhanced Surface Water Treatment Rule | TT | 1 | 2016 |
Violation Count vs. the National Corpus
Hannibal PWS has 178 recorded EPA violations, 84% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 16% carry more. 54% of this system's own violations are health-based (96 of 178), and it ranks #3,088 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
178 Higher than most more violations than 84% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| HFPO-DA | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/7/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/7/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBA | 8/7/2024 | 6.30 ppt | 5.00 ppt | Detected |
| 6:2 FTS | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/7/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| 8:2 FTS | 8/7/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/7/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/7/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTA | 6/11/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 6/11/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 6/11/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 6/11/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBA | 2/14/2024 | 12.40 ppt | 5.00 ppt | Detected |
| PFUnA | 2/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 2/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 2/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 2/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 2/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 2/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 2/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 2/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 2/14/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| 6:2 FTS | 2/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 2/14/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 2/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 2/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 2/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 2/14/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFOS | 2/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 2/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 2/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 2/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 2/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Hannibal PWS
96 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MO2010344.
Sources: EPA SDWIS · Missouri DNR, Public Drinking Water Branch
Nationwide peers
178 violations · 17,108 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Hannibal PWS
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Missouri compares on the same EPA violation measures. Missouri systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.