CA4410001 · California
BIG BASIN WATER COMPANY
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 18
- EPA health-based flag
- 0
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 18
Counties listed by EPA · Santa Cruz 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 18 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 91 days. The interval uses the reporting periods and dates on file.
Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 505079 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start June 1, 2022 · period end June 30, 2022 · first reported November 17, 2022 · EPA return-to-compliance field June 30, 2022
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805022 August 4, 2022 Formal State Administrative/Compliance Order without penalty issued 9805023 August 18, 2022 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505077 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2022 · period end March 31, 2022 · first reported August 17, 2022 · EPA return-to-compliance field March 31, 2022
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805019 June 6, 2022 Formal State Administrative/Compliance Order without penalty issued 9805025 November 10, 2022 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505076 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2022 · period end March 31, 2022 · first reported August 17, 2022 · EPA return-to-compliance field March 31, 2022
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805019 June 6, 2022 Formal State Administrative/Compliance Order without penalty issued 9805025 November 10, 2022 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 505075 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start October 1, 2021 · period end December 31, 2021 · first reported February 16, 2022 · EPA return-to-compliance field December 31, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805018 December 30, 2021 Formal State Administrative/Compliance Order without penalty issued 9805026 January 6, 2022 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505066 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance 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 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505065 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance 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 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505064 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start April 1, 2021 · period end June 30, 2021 · first reported November 15, 2021 · EPA return-to-compliance field June 30, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505063 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start April 1, 2021 · period end June 30, 2021 · first reported November 15, 2021 · EPA return-to-compliance field June 30, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505062 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2021 · period end March 31, 2021 · first reported November 15, 2021 · EPA return-to-compliance field March 31, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505061 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2021 · period end March 31, 2021 · first reported November 15, 2021 · EPA return-to-compliance field March 31, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505060 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start October 1, 2020 · period end December 31, 2020 · first reported November 15, 2021 · EPA return-to-compliance field December 31, 2020
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505059 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start October 1, 2020 · period end December 31, 2020 · first reported November 15, 2021 · EPA return-to-compliance field December 31, 2020
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505058 · Total Haloacetic Acids (HAA5) · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 1, 2020 · period end September 30, 2020 · first reported November 15, 2021 · EPA return-to-compliance field September 30, 2020
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 505057 · TTHM · Stage 2 Disinfectants and Disinfection Byproducts RuleNoncompliance period start July 1, 2020 · period end September 30, 2020 · first reported November 15, 2021 · EPA return-to-compliance field September 30, 2020
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805034 December 20, 2021 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 505074 · Simazine · Synthetic Organic ChemicalsNoncompliance period start January 1, 2018 · period end December 31, 2020 · first reported November 15, 2021 · EPA return-to-compliance field December 31, 2020
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805029 October 31, 2023 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 505073 · Nitrite · Nitrate RuleNoncompliance period start January 1, 2018 · period end December 31, 2020 · first reported November 15, 2021 · EPA return-to-compliance field December 31, 2020
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805029 October 31, 2023 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 505072 · Arsenic · Arsenic RuleNoncompliance period start January 1, 2018 · period end December 31, 2020 · first reported November 15, 2021 · EPA return-to-compliance field December 31, 2020
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805029 October 31, 2023 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 505071 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2018 · period end December 31, 2018 · first reported November 15, 2021 · EPA return-to-compliance field December 31, 2018
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 9805017 November 8, 2021 Formal State Administrative/Compliance Order without penalty issued 9805029 October 31, 2023 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