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DEFIANCE CITY

PWS ID: OH2000111 · DEFIANCE, Ohio 43512-2779

DEFIANCE CITY serves 16,494 people in DEFIANCE, Ohio using Surface Water water sources. It has 386 recorded EPA violations, including 297 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (3 compounds found).

Water Quality Snapshot: DEFIANCE CITY

DEFIANCE CITY is a local-owned community water system that delivers drinking water to 16,494 residents in DEFIANCE, Ohio (Defiance County) through 6,615 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 386 total violations for this system , of which 297 (77%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 55 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is TTHM, recorded in 194 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 3 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 0.0068 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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. DEFIANCE CITY's 386 violations sit above the Ohio average. Statewide, 204 of 346 UCMR5-tested systems have reported PFAS detections (59%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

3 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
16,494
Total Violations
386
Health-Based Violations
297
Water Source
Surface Water

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

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 10 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFEESA 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/22/2023 <9 µg/L 9 µg/L Not Detected
PFMPA 8/22/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/22/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 8/22/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/22/2023 0.0048 µg/L 0.003 µg/L Detected
PFHxS 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 8/22/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 8/22/2023 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 8/22/2023 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 8/22/2023 <0.006 µg/L 0.006 µg/L Not Detected
PFNA 8/22/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/22/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 8/22/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/22/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/22/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 8/22/2023 0.0051 µg/L 0.005 µg/L Detected
HFPO-DA 8/22/2023 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 8/22/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/22/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/22/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/22/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 8/22/2023 0.0032 µg/L 0.003 µg/L Detected
6:2 FTS 6/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/11/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/11/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/11/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 6/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpA 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 6/11/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/11/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFDoA 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 6/11/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 6/11/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/11/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFOA 6/11/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 6/11/2024 <0.003 µg/L 0.003 µg/L 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 DEFIANCE CITY.

Federal Source of Truth

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 OH2000111 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Ohio Drinking Water Authority

Ohio EPA — Division of Drinking and Ground Waters is the primacy agency that licenses and inspects DEFIANCE CITY under EPA-delegated authority.

Open OH regulator portal

Source: Ohio EPA — Division of Drinking and Ground Waters

Violation 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
2022 TTHM MCL 194 SDWIS / OH2000111 / 2950
2020 TTHM MR 6 SDWIS / OH2000111 / 2950
2019 Consumer Confidence Rule Other 24 SDWIS / OH2000111 / 7000
2018 Lead and Copper Rule TT 11 SDWIS / OH2000111 / 5000
2018 Public Notice Other 3 SDWIS / OH2000111 / 7500
2013 CARBON, TOTAL MR 4 SDWIS / OH2000111 / 2920
2007 Surface Water Treatment Rule TT 31 SDWIS / OH2000111 / 0200
2006 Nitrate MCL 61 SDWIS / OH2000111 / 1040
1998 Methoxychlor MR 5 SDWIS / OH2000111 / 2015
1998 Diquat MR 5 SDWIS / OH2000111 / 2032
1998 Endothall MR 5 SDWIS / OH2000111 / 2033
1998 OXAMYL MR 5 SDWIS / OH2000111 / 2036
1998 Carbofuran MR 5 SDWIS / OH2000111 / 2046
1998 Total Polychlorinated Biphenyls (PCB) MR 5 SDWIS / OH2000111 / 2383
1998 BHC-GAMMA MR 5 SDWIS / OH2000111 / 2010

How DEFIANCE CITY Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric DEFIANCE CITY Ohio avg Federal benchmark
Total violations 386 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 297 12.5 Indicates a contaminant exceeded a federal MCL
PFAS detection 3 compounds 59% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 16,494 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is DEFIANCE CITY water safe to drink? ▼
DEFIANCE CITY (PWS ID: OH2000111) has 386 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 3 PFAS compounds found. This system serves 16,494 people using Surface Water sources.
How many people does DEFIANCE CITY serve? ▼
DEFIANCE CITY serves 16,494 people in DEFIANCE, Ohio. It is a Local-owned system using Surface Water water sources with 6,615 service connections.
What type of violations does DEFIANCE CITY have? ▼
DEFIANCE CITY has 386 total violations: 297 health-based violations (MCL exceedances or treatment failures), 55 monitoring/reporting violations, and 42 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in DEFIANCE CITY water? ▼
Yes. UCMR5 testing detected 3 PFAS compounds in DEFIANCE CITY's water supply: PFPeA, PFBA, PFHxA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does DEFIANCE CITY use? ▼
DEFIANCE CITY uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial