Is LYON-SIOUX RWS-BOYDEN required to publish a Consumer Confidence Report?

Yes. LYON-SIOUX RWS-BOYDEN 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 LYON-SIOUX RWS-BOYDEN’s next Consumer Confidence Report due?

LYON-SIOUX RWS-BOYDEN’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.

ROCK RAPIDS, IA · Lyon County

LYON-SIOUX RWS-BOYDEN Water System

Consumer Confidence Report status

LYON-SIOUX RWS-BOYDEN 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 LYON-SIOUX RWS-BOYDEN.

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): IA6000744
System type: Community Water System
Population served: 605
Service connections: 244
Ownership: privately owned
Water source: groundwater (wells)

LYON-SIOUX RWS-BOYDEN is one of 403 community water systems in Iowa in the 501 to 3,300 people size category, serving 605 people from groundwater.

As of August 1, 2026, its federal record holds 6 entries between 1985 and 2026, all of which EPA lists as closed.

Of the 6, 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
January 1, 2026 – March 31, 2026
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
March 1, 2001 – March 31, 2001
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 1993 – March 31, 1993
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Nitrate
March 1, 1986 – September 30, 1986
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 11, 1985 – March 10, 1985
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 1, 1985 – March 31, 1985
Archived

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

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2026 – March 31, 2026	Monitoring, Regular	Nitrate	—	Archived
March 1, 2001 – March 31, 2001	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Resolved
January 1, 1993 – March 31, 1993	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Resolved
March 1, 1986 – September 30, 1986	Maximum Contaminant Level Violation, Average	Nitrate	Health-based	Resolved
February 11, 1985 – March 10, 1985	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
February 1, 1985 – March 31, 1985	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived

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

Enforcement actions

September 19, 2001State Compliance achieved4 linked violations
March 15, 2001State Formal Notice of Violation issued5 linked violations
May 31, 2000State Public Notification received3 linked violations
February 2, 1996State Formal Notice of Violation issued4 linked violations
November 30, 1994State Compliance achieved6 linked violations
May 25, 1994State Public Notification received9 linked violations

Common questions

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

LYON-SIOUX RURAL WATER SYSTEM

712-472-3755

ROCK RAPIDS, IA 51246