Public Water Partners

ONAWA, IA · Monona County

ONAWA MUNICIPAL WATER PLANT Water System

Consumer Confidence Report status

ONAWA MUNICIPAL WATER PLANT must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for ONAWA MUNICIPAL WATER PLANT.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Iowa’s official records. Always confirm current status with Iowa before making decisions based on this information.

System facts

System ID (PWSID)
IA6739095
System type
Community Water System
Population served
2,906
Service connections
1,350
Ownership
local government
Water source
groundwater (wells)

ONAWA MUNICIPAL WATER PLANT is one of 403 community water systems in Iowa in the 501 to 3,300 people size category, serving 2,906 people from groundwater.

As of August 1, 2026, its federal record holds 1 entry in 1988, all of which EPA lists as closed. Nothing has been added since 1988.

All 1 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves inorganic chemicals.

Violation history

  • Monitoring, Regular

    —

    Nitrate

    April 1, 1988 – March 31, 1991

    Resolved

Resolved addressed and confirmed by the state

Enforcement actions

Common questions

Is ONAWA MUNICIPAL WATER PLANT required to publish a Consumer Confidence Report?

Yes. ONAWA MUNICIPAL WATER PLANT is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is ONAWA MUNICIPAL WATER PLANT’s next Consumer Confidence Report due?

ONAWA MUNICIPAL WATER PLANT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does ONAWA MUNICIPAL WATER PLANT have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for ONAWA MUNICIPAL WATER PLANT.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

ONAWA MUNICIPAL WATER PLANT

712-420-5313

ONAWA, IA 51040