IA / Marengo
IA · Tap water records
Marengo tap water, in plain English
Here is what the EPA's own data shows about tap water in Marengo. According to EPA SDWIS data retrieved June 2026, Marengo is served by 2 active community water systems, together reported to serve about 2,481 people.
As of June 2026, EPA records show 39 violations across the community water system(s) serving Marengo, going back to the earliest EPA record. 35 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
Marengo Water Supply
2,435 served · groundwater · PWSID IA4843033 - Monitoring TTHM: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in August 2019. All have since returned to compliance, per EPA records.
- 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 August 2019. All have since returned to compliance, per EPA records.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2016. 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 April 1991. All have since returned to compliance, per EPA records.
Iowa Valley Estates
46 served · groundwater · PWSID IA4800634 - Health-based Nitrate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 35 times between April 2022 and October 2023. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
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.