Community Water System · PWS OH2000111
Defiance City
Operator location Defiance, Ohio - 77% of 386 violations are health-based (upper-third health share (> 23%)); surface water source; 16,494 served per SDWIS.
- 16,494
- People served (this PWS)
- 386
- EPA violations (this PWS)
- 297
- Health-based (this PWS)
- 3 PFAS
- UCMR5 (this PWS)
Defiance City standing, high SDWIS violation third
77% of 386 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 77% is upper-third health share (> 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #3,179 of 29,740 among systems serving 500+.
The verdict
Defiance City sits in the upper third of the sitemap cohort by violation count (386), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (16,494; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 77% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 3 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #3,179 of 29,740
- Population · /systems
- #110 of 931
- Population · OH
- 386
- Total EPA violations on record
- 77%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 6,615
- County
- Defiance
- School/Daycare
- No
- MCL Violations
- 255
- Monitoring Violations
- 55
- Treatment Tech Violations
- 42
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 194 | 2022 |
| Nitrate | MCL | 61 | 2006 |
| Surface Water Treatment Rule | TT | 31 | 2007 |
| Consumer Confidence Rule | Other | 24 | 2019 |
| Lead and Copper Rule | TT | 11 | 2018 |
| TTHM | MR | 6 | 2020 |
| Methoxychlor | MR | 5 | 1998 |
| Diquat | MR | 5 | 1998 |
| Endothall | MR | 5 | 1998 |
| OXAMYL | MR | 5 | 1998 |
| Carbofuran | MR | 5 | 1998 |
| Total Polychlorinated Biphenyls (PCB) | MR | 5 | 1998 |
| BHC-GAMMA | MR | 5 | 1998 |
| Picloram | MR | 5 | 1998 |
| 2,4-D | MR | 5 | 1998 |
| CARBON, TOTAL | MR | 4 | 2013 |
| Public Notice | Other | 3 | 2018 |
Violation Count vs. the National Corpus
Defiance City has 386 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 77% of this system's own violations are health-based (297 of 386), and it ranks #3,179 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)
386 Higher than most more violations than 93% 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. 10 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFEESA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/22/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/22/2023 | 4.80 ppt | 3.00 ppt | Detected |
| PFHxS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/22/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/22/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/22/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFNA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 8/22/2023 | 5.10 ppt | 5.00 ppt | Detected |
| HFPO-DA | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/22/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/22/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 8/22/2023 | 3.20 ppt | 3.00 ppt | Detected |
| 6:2 FTS | 6/11/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 6/11/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 6/11/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/11/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 6/11/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/11/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/11/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 6/11/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 6/11/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 6/11/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFOA | 6/11/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/11/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Defiance City
297 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for OH2000111.
Sources: EPA SDWIS · Ohio EPA, Division of Drinking and Ground Waters
Nationwide peers
386 violations · 16,494 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 Defiance City
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.