HALCYON, CA · San Luis Obispo County

HALCYON WATER SYSTEM Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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)

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

Contact

DUNBAR, WILL

805-249-8718

HALCYON, CA 93420