IA / Rock Valley
IA · Tap water records
Rock Valley tap water, in plain English
Here is what the EPA's own data shows about tap water in Rock Valley. According to EPA SDWIS data retrieved June 2026, Rock Valley is served by 2 active community water systems, together reported to serve about 6,289 people.
As of June 2026, EPA records show 10 violations across the community water system(s) serving Rock Valley, going back to the earliest EPA record. 3 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
Rock Valley Water Supply
4,059 served · groundwater · PWSID IA8482096 - Monitoring TTHM: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times in August 2024. EPA records do not show all of these as returned to compliance.
- Monitoring Total Haloacetic Acids (HAA5): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in August 2024. EPA records do not show all of these as returned to compliance.
Rock Valley Rural Water District
2,230 served · groundwater · PWSID IA8482701 - Health-based Groundwater Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 3 times in August 2016. The EPA record for these does not include a measured level. 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.