Is HALCYON WATER SYSTEM required to publish a Consumer Confidence Report?

Yes. HALCYON WATER SYSTEM 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 HALCYON WATER SYSTEM’s next Consumer Confidence Report due?

HALCYON WATER SYSTEM’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.

HALCYON, CA · San Luis Obispo County

HALCYON WATER SYSTEM Water System

Consumer Confidence Report status

HALCYON WATER SYSTEM 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 HALCYON WATER SYSTEM.

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 California’s official records. Always confirm current status with California before making decisions based on this information.

System facts

System ID (PWSID): CA4000501
System type: Community Water System
Population served: 110
Service connections: 46
Ownership: privately owned
Water source: groundwater (wells)

HALCYON WATER SYSTEM is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 110 people from groundwater.

As of August 1, 2026, its federal record holds 20 entries between 1979 and 1984, all of which EPA lists as closed. Nothing has been added since 1984.

Of the 20, 3 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 and the Radionuclides and Revised Rad Rule.

Violation history

Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
September 1, 1984 – September 30, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
August 1, 1984 – August 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
July 1, 1984 – July 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
June 1, 1984 – June 30, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
May 1, 1984 – May 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
April 1, 1984 – April 30, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
March 1, 1984 – March 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
January 1, 1984 – January 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
December 1, 1983 – December 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
November 1, 1983 – November 30, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
October 1, 1983 – October 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
August 1, 1983 – August 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
July 1, 1983 – July 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
March 1, 1983 – March 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
December 1, 1982 – December 31, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
November 1, 1982 – November 30, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
October 1, 1982 – October 31, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 30, 1980 – October 29, 1981
Archived
Monitoring, Check/Repeat/Confirmation
—
Selenium
June 1, 1979 – May 31, 1983
Archived

Archived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
September 1, 1984 – September 30, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
August 1, 1984 – August 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
July 1, 1984 – July 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
June 1, 1984 – June 30, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
May 1, 1984 – May 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
April 1, 1984 – April 30, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
March 1, 1984 – March 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
January 1, 1984 – January 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
December 1, 1983 – December 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
November 1, 1983 – November 30, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
October 1, 1983 – October 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
August 1, 1983 – August 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
July 1, 1983 – July 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
March 1, 1983 – March 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
December 1, 1982 – December 31, 1982	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
November 1, 1982 – November 30, 1982	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
October 1, 1982 – October 31, 1982	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
October 1, 1981 – September 30, 1982	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
October 30, 1980 – October 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
June 1, 1979 – May 31, 1983	Monitoring, Check/Repeat/Confirmation	Selenium	—	Archived

Archived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

January 29, 2024State Administrative/Compliance Order without penalty issued55 linked violations
June 10, 2021State Administrative/Compliance Order without penalty issued46 linked violations

Common questions

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

DUNBAR, WILL

805-249-8718

HALCYON, CA 93420