Community Water System · PWS OH4900712
London City PWS
Operator location Columbus, Ohio - 39% of 153 violations are health-based (upper-third health share (> 23%)); groundwater source; 10,256 served per SDWIS.
- 10,256
- People served (this PWS)
- 153
- EPA violations (this PWS)
- 60
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
London City PWS standing, high SDWIS violation third
39% of 153 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 39% is upper-third health share (> 23%). UCMR5: UCMR5 tested, none detected. Population rank #4,593 of 29,740 among systems serving 500+.
The verdict
London City PWS sits in the upper third of the sitemap cohort by violation count (153), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (10,256; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 39% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #4,593 of 29,740
- Population · /systems
- #159 of 931
- Population · OH
- 153
- Total EPA violations on record
- 39%
- 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
- 4,302
- County
- Madison
- School/Daycare
- No
- MCL Violations
- 60
- Monitoring Violations
- 78
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 55 | 2015 |
| Consumer Confidence Rule | Other | 11 | 2024 |
| Coliform (TCR) | MR | 7 | 2003 |
| Revised Total Coliform Rule | MCL | 5 | 2022 |
| Diquat | MR | 4 | 1997 |
| Endothall | MR | 4 | 1997 |
| Glyphosate | MR | 4 | 1997 |
| Di(2-ethylhexyl) adipate | MR | 4 | 1997 |
| Picloram | MR | 4 | 1997 |
| Carbofuran | MR | 4 | 1997 |
| Benzo(a)pyrene | MR | 4 | 1997 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 1997 |
| Simazine | MR | 4 | 1996 |
| Atrazine | MR | 4 | 1996 |
| OXAMYL | MR | 4 | 1997 |
| Methoxychlor | MR | 4 | 1997 |
| Pentachlorophenol | MR | 4 | 1997 |
| BHC-GAMMA | MR | 4 | 1997 |
| LASSO | MR | 4 | 1996 |
| 2,4-D | MR | 4 | 1997 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 1997 |
| E. COLI | MR | 3 | 2023 |
Violation Count vs. the National Corpus
London City PWS has 153 recorded EPA violations, 81% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 19% carry more. 39% of this system's own violations are health-based (60 of 153), and it ranks #4,593 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)
153 Higher than most more violations than 81% 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 |
|---|---|---|---|---|
| PFBS | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 4/24/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 4/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 4/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 4/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 4/24/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHpA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 4/24/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| ADONA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 4/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 4/24/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHxS | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 4/24/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 4/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 4/24/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFPeS | 4/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 4/24/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 4/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 4/24/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 4/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 4/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 4/24/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 1/10/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHxS | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 1/10/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 1/10/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 1/10/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFMPA | 1/10/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NEtFOSAA | 1/10/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 1/10/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 1/10/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFMBA | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 1/10/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 1/10/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 1/10/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 1/10/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
Health-based violations on London City PWS
60 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OH4900712.
Sources: EPA SDWIS · Ohio EPA, Division of Drinking and Ground Waters
Nationwide peers
153 violations · 10,256 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 London City PWS
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Ohio compares on the same EPA violation measures. Ohio 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.