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

As of June 2026, EPA SDWIS records show 7 violation(s) across the community water systems serving Rock Rapids, 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 Rock Rapids, IA tap water come from?

Rock Rapids is served by 5 active community water system(s). Their primary sources, per EPA records, are: groundwater.

IA / Rock Rapids

IA · Tap water records

Rock Rapids tap water, in plain English

Here is what the EPA's own data shows about tap water in Rock Rapids. According to EPA SDWIS data retrieved June 2026, Rock Rapids is served by 5 active community water systems, together reported to serve about 7,698 people.

As of June 2026, EPA records show 7 violations across the community water system(s) serving Rock Rapids, 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.

5

Community water systems
~7,698

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Rock Rapids Municipal Water Works

2,611 served · groundwater · PWSID IA6065092

As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Lyon-Sioux Rws-Doon

1,765 served · groundwater · PWSID IA6000733

Monitoring Nitrate: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in July 2018. All have since returned to compliance, per EPA records.

Lyon-Sioux Rws-Big Sioux

1,530 served · groundwater · PWSID IA6000755

Monitoring Nitrite: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in October 2019. All have since returned to compliance, per EPA records.
Monitoring Combined Radium (-226 and -228): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times in July 2012. 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 June 2004. All have since returned to compliance, per EPA records.

Lyon-Sioux Rws-Rock Rapids

1,187 served · groundwater · PWSID IA6000800

As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

Lyon-Sioux Rws-Boyden

605 served · groundwater · PWSID IA6000744

As of June 2026, EPA records show no reported violations for this system in the period covered. This is not a guarantee about every substance, or about the water inside your home's plumbing.

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.