Is MAHASKA RURAL WATER SYSTEM, INC. required to publish a Consumer Confidence Report?

Yes. MAHASKA RURAL WATER SYSTEM, INC. 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 MAHASKA RURAL WATER SYSTEM, INC.’s next Consumer Confidence Report due?

MAHASKA RURAL WATER SYSTEM, INC.’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

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.

OSKALOOSA, IA · Mahaska County

MAHASKA RURAL WATER SYSTEM, INC. Water System

Consumer Confidence Report status

MAHASKA RURAL WATER SYSTEM, INC. 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 MAHASKA RURAL WATER SYSTEM, INC..

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): IA6273901
System type: Community Water System
Population served: 9,818
Service connections: 4,530
Ownership: privately owned
Water source: groundwater (wells)

MAHASKA RURAL WATER SYSTEM, INC. is one of 91 community water systems in Iowa in the 3,301 to 10,000 people size category, serving 9,818 people from groundwater.

As of August 1, 2026, its federal record holds 4 entries between 1980 and 2016, all of which EPA lists as closed. Nothing has been added since 2016.

Of the 4, 2 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 the Total Coliform Rules and the Radionuclides and Revised Rad Rule.

Violation history

Treatment Technique, Level 1 Assessment (RTCR)
Health-based
Revised Total Coliform Rule
April 1, 2016 – May 16, 2017
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2015 – August 31, 2015
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
November 1, 1995 – November 30, 1995
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
September 30, 1980 – September 29, 1983
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
April 1, 2016 – May 16, 2017	Treatment Technique, Level 1 Assessment (RTCR)	Revised Total Coliform Rule	Health-based	Resolved
August 1, 2015 – August 31, 2015	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
November 1, 1995 – November 30, 1995	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
September 30, 1980 – September 29, 1983	Monitoring, Regular	Combined Radium (-226 and -228)	—	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

March 17, 2018State Compliance achieved2 linked violations
June 24, 2017State Public Notification received3 linked violations
July 20, 2016State Formal Notice of Violation issued4 linked violations
December 4, 2002State Formal Notice of Violation issued3 linked violations
December 4, 2002State Public Notification requested2 linked violations
December 12, 1995State Compliance achieved2 linked violations
February 16, 1982State Unresolvedgeneral compliance action — not tied to a specific violation on record

Common questions

Is MAHASKA RURAL WATER SYSTEM, INC. required to publish a Consumer Confidence Report?: Yes. MAHASKA RURAL WATER SYSTEM, INC. 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 MAHASKA RURAL WATER SYSTEM, INC.’s next Consumer Confidence Report due?: MAHASKA RURAL WATER SYSTEM, INC.’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does MAHASKA RURAL WATER SYSTEM, INC. have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for MAHASKA RURAL WATER SYSTEM, INC..
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

MAHASKA RURAL WATER SYSTEM INC

641-673-8851

OSKALOOSA, IA 52577