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

As of October 2026, EPA SDWIS records show 4 violation(s) across the community water systems serving Maquoketa, of which 1 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Maquoketa, IA tap water come from?

Maquoketa is served by 3 active community water system(s). Their primary sources, per EPA records, are: groundwater.

IA / Maquoketa

IA · Tap water records

Maquoketa tap water, in plain English

Here is what the EPA's own data shows about tap water in Maquoketa. According to EPA SDWIS data retrieved October 2026, Maquoketa is served by 3 active community water systems, together reported to serve about 7,071 people.

As of October 2026, EPA records show 4 violations across the community water system(s) serving Maquoketa, going back to the earliest EPA record. 1 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.

3

Community water systems
~7,071

People served (EPA-reported)
October 2026

EPA records reviewed through

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What the EPA has on record, by system

Maquoketa Municipal Water

6,128 served · groundwater · PWSID IA4950029

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 2025. EPA records do not show all of these as returned to compliance.
Monitoring Diquat: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2018. All have since returned to compliance, per EPA records.

Delmar Water Supply

542 served · groundwater · PWSID IA2328024

Health-based Groundwater Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in January 2018. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.

Charlotte Water Works

401 served · groundwater · PWSID IA2324016

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 October 1990. 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 October 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.