Community Water System · PWS SC4010001
Columbia City of (Sc4010001)
Operator location Columbia, South Carolina - 71% of 76 violations are health-based (upper-third health share (> 23%)); surface water source; 319,500 served per SDWIS.
- 319,500
- People served (this PWS)
- 76
- EPA violations (this PWS)
- 54
- Health-based (this PWS)
- 7 PFAS
- UCMR5 (this PWS)
Columbia City of (Sc4010001) standing, high SDWIS violation third
71% of 76 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 71% is upper-third health share (> 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #111 of 29,740 among systems serving 500+.
The verdict
Columbia City of (Sc4010001) sits in the upper third of the sitemap cohort by violation count (76), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (319,500; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 71% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 7 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #111 of 29,740
- Population · /systems
- #3 of 314
- Population · SC
- 76
- Total EPA violations on record
- 71%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 153,420
- County
- Richland
- School/Daycare
- No
- MCL Violations
- 25
- Monitoring Violations
- 11
- Treatment Tech Violations
- 29
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | TT | 29 | 2015 |
| Coliform (TCR) | MCL | 13 | 1999 |
| Revised Total Coliform Rule | MCL | 9 | 2021 |
| Nitrate | MR | 3 | 1993 |
| Chlorite | MR | 3 | 2017 |
| Chlorite | MCL | 3 | 2024 |
| Mercury | MR | 1 | 1993 |
| Cadmium | MR | 1 | 1993 |
| Chromium | MR | 1 | 1993 |
| Selenium | MR | 1 | 1993 |
| Barium | MR | 1 | 1993 |
Violation Count vs. the National Corpus
Columbia City of (Sc4010001) has 76 recorded EPA violations, 67% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 33% carry more. 71% of this system's own violations are health-based (54 of 76), and it ranks #111 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)
76 Around the middle fewer violations than 33% 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. 38 of 232 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| ADONA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/23/2025 | 7.80 ppt | 5.00 ppt | Detected |
| PFPeA | 9/23/2025 | 6.80 ppt | 3.00 ppt | Detected |
| PFBA | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 9/23/2025 | 5.70 ppt | 3.00 ppt | Detected |
| PFTA | 9/23/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| 6:2 FTS | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/23/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 9/23/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/23/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFMPA | 9/23/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/23/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 9/23/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 9/23/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/23/2025 | 3.00 ppt | 3.00 ppt | Detected |
| PFNA | 9/23/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/23/2025 | 8.60 ppt | 4.00 ppt | Detected |
| PFOA | 9/23/2025 | 6.90 ppt | 4.00 ppt | Detected |
| PFDA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/23/2025 | 5.20 ppt | 3.00 ppt | Detected |
| PFDoA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/23/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 9/23/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| 6:2 FTS | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 9/23/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/23/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| 4:2 FTS | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 9/23/2025 | 3.50 ppt | 3.00 ppt | Detected |
| PFUnA | 9/23/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 8:2 FTS | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/23/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/23/2025 | 7.70 ppt | 5.00 ppt | Detected |
| PFHpS | 9/23/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/23/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 9/23/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
Health-based violations on Columbia City of (Sc4010001)
54 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for SC4010001.
Sources: EPA SDWIS
Nationwide peers
76 violations · 319,500 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 Columbia City of
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in South Carolina compares on the same EPA violation measures. South Carolina 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.