OH / Defiance
OH · Tap water records
Defiance tap water, in plain English
Here is what the EPA's own data shows about tap water in Defiance. According to EPA SDWIS data retrieved June 2026, Defiance is served by 6 active community water systems, together reported to serve about 20,157 people.
As of June 2026, EPA records show 215 violations across the community water system(s) serving Defiance, going back to the earliest EPA record. 173 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.
What the EPA has on record, by system
Defiance City
16,494 served · surface water · PWSID OH2000111 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 25 times between October 2017 and July 2022. The EPA record lists a level of 0.09 MG/L; the limit (MCL) is 0.08 MG/L. All have since returned to compliance, per EPA records.
- Health-based Lead and Copper Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times between January 2017 and January 2018. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Monitoring TTHM: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in April 2020. All have since returned to compliance, per EPA records.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 7 times between July 2001 and December 2019. EPA records do not show all of these as returned to compliance.
- Monitoring Public Notice: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in September 2018. All have since returned to compliance, per EPA records.
Ayersville Water And Sewer District
2,372 served · surface water · PWSID OH2000903 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 47 times between July 2016 and July 2022. The EPA record lists a level of 0.087 MG/L; the limit (MCL) is 0.08 MG/L. All have since returned to compliance, per EPA records.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 7 times between July 2005 and July 2024. EPA records do not show all of these as returned to compliance.
- Monitoring Stage 2 Disinfectants and Disinfection Byproducts Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2010. All have since returned to compliance, per EPA records.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 1999. All have since returned to compliance, per EPA records.
Brunersburg Wd - Brunersburg Pws
500 served · surface water · PWSID OH2001103 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 6 times between October 2021 and April 2022. The EPA record lists a level of 0.083 MG/L; the limit (MCL) is 0.08 MG/L. All have since returned to compliance, per EPA records.
- Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2022. All have since returned to compliance, per EPA records.
Christi Water System Inc
483 served · surface water · PWSID OH2001003 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 6 times between October 2021 and April 2022. The EPA record lists a level of 0.083 MG/L; the limit (MCL) is 0.08 MG/L. All have since returned to compliance, per EPA records.
- Health-based Lead and Copper Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 8 times between January 2002 and January 2008. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 13 times between July 2001 and July 2024. All have since returned to compliance, per EPA records.
- Monitoring TTHM: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in April 2016. All have since returned to compliance, per EPA records.
- Monitoring Total Haloacetic Acids (HAA5): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in April 2016. All have since returned to compliance, per EPA records.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times between January 1995 and January 2001. All have since returned to compliance, per EPA records.
Brunersburg Wd - Evansport Pws
268 served · surface water · PWSID OH2001203 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 49 times between July 2016 and October 2022. The EPA record lists a level of 0.085 MG/L; the limit (MCL) is 0.08 MG/L. EPA records do not show all of these as returned to compliance.
- Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2022. All have since returned to compliance, per EPA records.
- Monitoring Public Notice: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in March 2020. All have since returned to compliance, per EPA records.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in September 2018. EPA records do not show all of these as returned to compliance.
Brunersburg Wd - Airport Pws
40 served · surface water · PWSID OH2001403 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 30 times between April 2017 and October 2022. The EPA record lists a level of 0.095 MG/L; the limit (MCL) is 0.08 MG/L. All have since returned to compliance, per EPA records.
- Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2022. All have since returned to compliance, per EPA records.
- Monitoring Public Notice: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in March 2020. All have since returned to compliance, per EPA records.
What this means
A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.
This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.
Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.