Community Water System · PWS MS0460003
City of Columbia
Operator location Columbia, Mississippi - larger served population (> 3,309) at 5,900 people served; 268 SDWIS violations on record from groundwater sources.
- 5,900
- People served (this PWS)
- 268
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
City of Columbia standing, high SDWIS violation third
5,900 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 2% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #6,918 of 29,740 among systems serving 500+.
The verdict
City of Columbia sits in the upper third of the sitemap cohort by violation count (268), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (5,900; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 2% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #6,918 of 29,740
- Population · /systems
- #112 of 837
- Population · MS
- 268
- Total EPA violations on record
- 2%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 2,580
- County
- Marion
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 250
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Combined Uranium | MR | 76 | 2012 |
| Radium-228 | MR | 52 | 2012 |
| Radium-226 | MR | 48 | 2012 |
| Combined Radium (-226 and -228) | MR | 28 | 2008 |
| Gross Alpha, Excl. Radon and U | MR | 28 | 2008 |
| Chlorine | MR | 7 | 2010 |
| Coliform (TCR) | MR | 7 | 2010 |
| Coliform (TCR) | MCL | 4 | 2014 |
| Consumer Confidence Rule | Other | 2 | 2011 |
| TTHM | MR | 2 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 2 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 2 | 2024 |
| Public Notice | Other | 1 | 2008 |
Violation Count vs. the National Corpus
City of Columbia has 268 recorded EPA violations, 89% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 11% carry more. 2% of this system's own violations are health-based (6 of 268), and it ranks #6,918 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)
268 Higher than most more violations than 89% 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. 0 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFDA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/5/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/5/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/5/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/5/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 9/5/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 9/5/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFOA | 9/5/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 9/5/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 9/5/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 9/5/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/5/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 9/5/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 9/5/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/5/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 12/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 12/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 12/19/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 12/19/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 12/19/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 12/19/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFEESA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 12/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 12/19/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 12/19/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 12/19/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 12/19/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
Population served record for City of Columbia
EPA SDWIS lists 5,900 people served and 2,580 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
268 violations · 5,900 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 City of Columbia
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Mississippi compares on the same EPA violation measures. Mississippi 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.