OK / Frederick
OK · Tap water records
Frederick tap water, in plain English
Here is what the EPA's own data shows about tap water in Frederick. According to EPA SDWIS data retrieved June 2026, Frederick is served by 1 active community water system, together reported to serve about 3,940 people.
As of June 2026, EPA records show 117 violations across the community water system(s) serving Frederick, going back to the earliest EPA record. 109 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
Frederick
3,940 served · surface water · PWSID OK1011401 - Health-based Asbestos: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times between July 2025 and October 2025. The EPA record lists a level of 80 MFL; the limit (MCL) is 7 MFL. EPA records do not show all of these as returned to compliance.
- Health-based LEAD AND COPPER RULE REVISIONS: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in October 2024. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 59 times between April 2004 and April 2024. The EPA record lists a level of 0.124 ; the limit (MCL) is 0.08 . EPA records do not show all of these as returned to compliance.
- Health-based CARBON, TOTAL: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 44 times between October 2004 and July 2023. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Health-based Chlorite: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times between February 2016 and January 2018. The EPA record lists a level of 1.1 MG/L; the limit (MCL) is 1 MG/L. All have since returned to compliance, per EPA records.
- Health-based Coliform (TCR): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in January 1998. The EPA record lists a level of 0 ; the limit (MCL) is 0 . All have since returned to compliance, per EPA records.
- Monitoring LEAD AND COPPER RULE REVISIONS: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 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 September 2015. 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 2 times between October 2009 and July 2010. All have since returned to compliance, per EPA records.
- Monitoring Coliform (Pre-TCR): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between November 1980 and June 1989. All have since returned to compliance, per EPA records.
- Monitoring Turbidity: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between October 1979 and November 1979. 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.