Does Jefferson, IA tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 3 violation(s) across the community water systems serving Jefferson, of which 0 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Jefferson, IA tap water come from?

Jefferson is served by 1 active community water system(s). Their primary sources, per EPA records, are: groundwater.

IA / Jefferson

IA · Tap water records

Jefferson tap water, in plain English

Here is what the EPA's own data shows about tap water in Jefferson. According to EPA SDWIS data retrieved June 2026, Jefferson is served by 1 active community water system, together reported to serve about 4,182 people.

As of June 2026, EPA records show 3 violations across the community water system(s) serving Jefferson, going back to the earliest EPA record. None were health-based; the records are monitoring or reporting violations (a required test or report was late or missed). Each is listed by system below, with its status.

1

Community water system
~4,182

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Jefferson Water Department

4,182 served · groundwater · PWSID IA3742004

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 2020. 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 Nitrite: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in April 2019. 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.