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

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

LYON-SIOUX RWS-DOON’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-DOON Water System

Consumer Confidence Report status

LYON-SIOUX RWS-DOON 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-DOON.

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): IA6000733
System type: Community Water System
Population served: 1,765
Service connections: 706
Ownership: privately owned
Water source: groundwater (wells)

LYON-SIOUX RWS-DOON is one of 403 community water systems in Iowa in the 501 to 3,300 people size category, serving 1,765 people from groundwater.

As of August 1, 2026, its federal record holds 4 entries between 1983 and 2018, all of which EPA lists as closed. Nothing has been added since 2018.

Of the 4, 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
July 1, 2018 – June 30, 2019
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 1994 – March 31, 1994
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 1984 – February 28, 1985
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 1983 – December 31, 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
July 1, 2018 – June 30, 2019	Monitoring, Regular	Nitrate	—	Resolved
January 1, 1994 – March 31, 1994	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Resolved
October 1, 1984 – February 28, 1985	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 1983 – December 31, 1983	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived

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

Enforcement actions

August 1, 2019State Formal Notice of Violation issued5 linked violations
January 26, 1998State Formal Notice of Violation issued1 linked violation
June 21, 1994State Formal Notice of Violation issued3 linked violations
October 9, 1989State Compliance achieved1 linked violation
October 9, 1989State Compliance achieved36 linked violations
February 16, 1982State Unresolvedgeneral compliance action — not tied to a specific violation on record

Common questions

Is LYON-SIOUX RWS-DOON required to publish a Consumer Confidence Report?: Yes. LYON-SIOUX RWS-DOON 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-DOON’s next Consumer Confidence Report due?: LYON-SIOUX RWS-DOON’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does LYON-SIOUX RWS-DOON 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-DOON.
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