CA4000501 · California

HALCYON WATER SYSTEM

Federal fiscal 2026Q3 · EPA violation and follow-up records

Violation records shown: 24
EPA health-based flag: 1
Health-based records unresolved in this snapshot: 1
Monitoring and reporting records: 23

Counties listed by EPA · San Luis Obispo County, California

Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.

Violations and what followed

Among 2 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 189.5 days. The interval uses the reporting periods and dates on file.

EPA health-based flag · Unaddressed by formal action
LSL InventoryViolation 25 · LEAD AND COPPER RULE REVISIONS · Lead and Copper Rule Revisions
Noncompliance period start October 17, 2024 · first reported April 1, 2025
No linked action row appears in the records shown.
Monitoring or reporting · Archived
Monitoring, RegularViolation 32 · Selenium · Inorganic Chemicals
Noncompliance period start April 1, 2026 · period end June 30, 2026 · first reported September 22, 2026 · EPA return-to-compliance field June 30, 2026

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 30 · Selenium · Inorganic Chemicals
Noncompliance period start January 1, 2026 · period end March 31, 2026 · first reported June 22, 2026 · EPA return-to-compliance field March 31, 2026

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 29 · Selenium · Inorganic Chemicals
Noncompliance period start October 1, 2025 · period end December 31, 2025 · first reported March 20, 2026 · EPA return-to-compliance field December 31, 2025

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 28 · Selenium · Inorganic Chemicals
Noncompliance period start July 1, 2025 · period end September 30, 2025 · first reported November 17, 2025 · EPA return-to-compliance field September 30, 2025

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 24 · Selenium · Inorganic Chemicals
Noncompliance period start January 1, 2025 · period end March 31, 2025 · first reported June 3, 2025 · EPA return-to-compliance field March 31, 2025

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Unaddressed by formal action
LSL ReportingViolation 26 · LEAD AND COPPER RULE REVISIONS · Lead and Copper Rule Revisions
Noncompliance period start October 17, 2024 · first reported April 1, 2025
No linked action row appears in the records shown.
Monitoring or reporting · Archived
Monitoring, RegularViolation 23 · Selenium · Inorganic Chemicals
Noncompliance period start October 1, 2024 · period end December 31, 2024 · first reported February 24, 2025 · EPA return-to-compliance field December 31, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 22 · Selenium · Inorganic Chemicals
Noncompliance period start July 1, 2024 · period end September 30, 2024 · first reported February 24, 2025 · EPA return-to-compliance field September 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 20 · Selenium · Inorganic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported August 15, 2024 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Monitoring or reporting · Resolved

Monitoring, RegularViolation 18 · Nitrate · Nitrate Rule

Noncompliance period start January 1, 2024 · period end March 26, 2024 · first reported May 15, 2024 · EPA return-to-compliance field March 26, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300040	June 8, 2023	Formal	State Administrative/Compliance Order without penalty issued
300043	March 26, 2024	Resolving	State Compliance achieved

Monitoring or reporting · Archived
Monitoring, RegularViolation 14 · Nitrate · Nitrate Rule
Noncompliance period start July 1, 2023 · period end September 30, 2023 · first reported October 2, 2023 · EPA return-to-compliance field September 30, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 12 · Nitrate · Nitrate Rule
Noncompliance period start April 1, 2023 · period end June 30, 2023 · first reported July 3, 2023 · EPA return-to-compliance field June 30, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 17 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2023 · period end December 31, 2023 · first reported February 15, 2024 · EPA return-to-compliance field December 31, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300042 January 29, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 11 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2023 · period end March 31, 2023 · first reported May 16, 2023 · EPA return-to-compliance field March 31, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300036 August 2, 2022 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 15 · Nitrate · Nitrate Rule
Noncompliance period start October 1, 2022 · period end December 31, 2022 · first reported November 15, 2023 · EPA return-to-compliance field December 31, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 10 · Nitrate · Nitrate Rule
Noncompliance period start October 1, 2022 · period end December 31, 2022 · first reported February 16, 2023 · EPA return-to-compliance field December 31, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 9 · Nitrate · Nitrate Rule
Noncompliance period start July 1, 2022 · period end September 30, 2022 · first reported November 17, 2022 · EPA return-to-compliance field September 30, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 6 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2022 · period end March 31, 2022 · first reported May 16, 2022 · EPA return-to-compliance field March 31, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 5 · Nitrate · Nitrate Rule
Noncompliance period start October 1, 2021 · period end December 31, 2021 · first reported February 16, 2022 · EPA return-to-compliance field December 31, 2021

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300042	January 29, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300036	August 2, 2022	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Monitoring or reporting · Archived

Monitoring, RegularViolation 4 · Nitrate · Nitrate Rule

Noncompliance period start July 1, 2021 · period end September 30, 2021 · first reported February 16, 2022 · EPA return-to-compliance field September 30, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300033	May 25, 2021	Formal	State Administrative/Compliance Order without penalty issued
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Monitoring or reporting · Archived
Monitoring, RegularViolation 3 · Nitrate · Nitrate Rule
Noncompliance period start May 25, 2021 · period end August 24, 2021 · first reported November 15, 2021 · EPA return-to-compliance field August 24, 2021

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 7 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2021 · period end December 31, 2021 · first reported August 17, 2022 · EPA return-to-compliance field December 31, 2021

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
300034 June 10, 2021 Formal State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300034	June 10, 2021	Formal	State Administrative/Compliance Order without penalty issued

Monitoring or reporting · Resolved

Follow-up Or Routine LCR Tap M/RViolation 2 · Lead and Copper Rule · Lead and Copper Rule

Noncompliance period start October 1, 2020 · period end July 22, 2021 · first reported January 5, 2021 · EPA return-to-compliance field July 22, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
300032	December 21, 2020	Formal	State Administrative/Compliance Order without penalty issued
300035	July 22, 2021	Resolving	State Compliance achieved

EPA data and scope

How to read the records

The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.

We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.

EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility