Community Water System · PWS OH4900712
London City PWS
Columbus, Ohio 43201 - drinking water served from groundwater sources to 10,256 people, tracked in EPA SDWIS and UCMR5.
- 10,256
- People served
- 153
- EPA violations
- 60
- Health-based
- No PFAS
- UCMR5 result
The verdict
EPA records 153 drinking-water violations at London City PWS, 39% of them health-based - above the Ohio per-system average.
- 153
- Total EPA violations on record
- 39%
- Health-based (MCL / treatment failure)
- 10,256
- People served by this system
- 0
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: London City PWS
London City PWS is a local-owned community water system that delivers drinking water to 10,256 residents in Columbus, Ohio (Madison County) through 4,302 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 153 total violations for this system , of which 60 (39%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 78 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 55 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.
Across Ohio, EPA tracks 4,181 public water systems serving 11,085,226 people, with 288,388 cumulative violations and 52,412 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Statewide, 204 of 346 UCMR5-tested systems have reported PFAS detections (59%).
London City PWS's 153 violations sit above the Ohio average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
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 |
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 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for London City PWS.
EPA SDWIS, Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID OH4900712 on SDWISSource: EPA SDWIS Federal Reports Search
Ohio Drinking Water Authority
Ohio EPA, Division of Drinking and Ground Waters is the primacy agency that licenses and inspects London City PWS under EPA-delegated authority.
Open OH regulator portalViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2024 | Consumer Confidence Rule | Other | 11 | SDWIS / OH4900712 / 7000 |
| 2023 | E. COLI | MR | 3 | SDWIS / OH4900712 / 3014 |
| 2022 | Revised Total Coliform Rule | MCL | 5 | SDWIS / OH4900712 / 8000 |
| 2015 | Coliform (TCR) | MCL | 55 | SDWIS / OH4900712 / 3100 |
| 2003 | Coliform (TCR) | MR | 7 | SDWIS / OH4900712 / 3100 |
| 1997 | Diquat | MR | 4 | SDWIS / OH4900712 / 2032 |
| 1997 | Endothall | MR | 4 | SDWIS / OH4900712 / 2033 |
| 1997 | Glyphosate | MR | 4 | SDWIS / OH4900712 / 2034 |
| 1997 | Di(2-ethylhexyl) adipate | MR | 4 | SDWIS / OH4900712 / 2035 |
| 1997 | Picloram | MR | 4 | SDWIS / OH4900712 / 2040 |
| 1997 | Carbofuran | MR | 4 | SDWIS / OH4900712 / 2046 |
| 1997 | Benzo(a)pyrene | MR | 4 | SDWIS / OH4900712 / 2306 |
| 1997 | Total Polychlorinated Biphenyls (PCB) | MR | 4 | SDWIS / OH4900712 / 2383 |
| 1997 | OXAMYL | MR | 4 | SDWIS / OH4900712 / 2036 |
| 1997 | Methoxychlor | MR | 4 | SDWIS / OH4900712 / 2015 |
How London City PWS Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | London City PWS | Ohio avg | Federal benchmark |
|---|---|---|---|
| Total violations | 153 | 69 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 60 | 12.5 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 59% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 10,256 | 2,651 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,181 regulated public water systems in Ohio.
Federal MCL reference, Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026) |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is London City PWS water safe to drink? ▼
How many people does London City PWS serve? ▼
What type of violations does London City PWS have? ▼
Has PFAS been detected in London City PWS water? ▼
What water source does London City PWS use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.