CASTROVILLE, CA · Santa Clara County

TWIN VALLEY INC 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): CA4300575
System type: Community Water System
Population served: 317
Service connections: 96
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 1, 2023 – November 30, 2023
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
July 1, 2023 – July 31, 2023
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
June 1, 2023 – June 30, 2023
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 1, 2022 – November 30, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 2022 – October 31, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
September 1, 2022 – September 30, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
August 1, 2022 – August 31, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
July 1, 2022 – July 31, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
May 1, 2022 – May 31, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
December 1, 2021 – December 31, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 1, 2021 – November 30, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 2021 – October 31, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
September 1, 2021 – September 30, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
August 1, 2021 – August 31, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
July 1, 2021 – July 31, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
June 1, 2021 – June 30, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
May 1, 2021 – May 31, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
April 1, 2021 – April 30, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
March 1, 2021 – March 31, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 1, 2021 – February 28, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 2021 – January 31, 2021
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
December 1, 2020 – December 31, 2020
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 1, 2020 – November 30, 2020
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
July 1, 2020 – July 31, 2020
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
April 1, 2020 – April 30, 2020
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
March 1, 2020 – March 31, 2020
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 1, 2020 – February 29, 2020
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 2020 – January 31, 2020
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
December 1, 2019 – December 31, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 1, 2019 – November 30, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 2019 – October 31, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
September 1, 2019 – September 30, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
July 1, 2019 – July 31, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
June 1, 2019 – June 30, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
May 1, 2019 – May 31, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 2019 – January 31, 2019
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 1, 2018 – November 30, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 2018 – October 31, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
September 1, 2018 – September 30, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
August 1, 2018 – August 31, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
July 1, 2018 – July 31, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
June 1, 2018 – June 30, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
May 1, 2018 – May 31, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
April 1, 2018 – April 30, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
March 1, 2018 – March 31, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 1, 2018 – February 28, 2018
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 2018 – January 31, 2018
Archived
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
August 1, 2017 – August 31, 2017
Archived
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
February 1, 2017 – February 28, 2017
Archived
Variance/Exemption/Other Compliance
—
No contaminant on record
July 15, 2016 – October 14, 2016
Resolved
Variance/Exemption/Other Compliance
—
No contaminant on record
June 30, 2016 – September 29, 2016
Resolved
Variance/Exemption/Other Compliance
—
No contaminant on record
February 5, 2016 – May 4, 2016
Resolved
Monitoring of Treatment (SWTR-Unfilt/GWR)
—
Groundwater Rule
March 1, 2015 – March 31, 2015
Resolved
Monitoring of Treatment (SWTR-Unfilt/GWR)
—
Groundwater Rule
October 1, 2014 – October 31, 2014
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 2012 – August 31, 2012
Resolved
Notification, Public
—
No contaminant on record
September 1, 1984 – September 30, 1984
Archived
Notification, Public
—
No contaminant on record
August 1, 1984 – August 31, 1984
Archived
Notification, Public
—
No contaminant on record
July 1, 1984 – July 31, 1984
Archived
Notification, Public
—
No contaminant on record
April 1, 1983 – April 30, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
April 1, 1983 – April 30, 1983
Archived
Notification, Public
—
No contaminant on record
March 1, 1983 – March 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
March 1, 1983 – March 31, 1983
Archived
Notification, Public
—
No contaminant on record
January 1, 1983 – January 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
January 1, 1983 – January 31, 1983
Archived
Notification, Public
—
No contaminant on record
December 1, 1982 – December 31, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
December 1, 1982 – December 31, 1982
Archived
Notification, Public
—
No contaminant on record
November 1, 1982 – November 30, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 1, 1982 – November 30, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 6, 1982 – August 5, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
October 1, 1982 – October 31, 1982
Archived
Notification, Public
—
No contaminant on record
October 1, 1982 – October 31, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
September 8, 1982 – October 7, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
August 3, 1982 – September 2, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
May 5, 1982 – June 4, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
April 6, 1982 – May 5, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
March 4, 1982 – May 3, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
February 3, 1982 – April 2, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
December 3, 1981 – February 2, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
November 4, 1981 – March 3, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived

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

Period	Violation	Contaminant / rule	Health-based	Status
November 1, 2023 – November 30, 2023	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 1, 2023 – July 31, 2023	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
June 1, 2023 – June 30, 2023	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
November 1, 2022 – November 30, 2022	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 2022 – October 31, 2022	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
September 1, 2022 – September 30, 2022	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
August 1, 2022 – August 31, 2022	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 1, 2022 – July 31, 2022	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
May 1, 2022 – May 31, 2022	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
December 1, 2021 – December 31, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
November 1, 2021 – November 30, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 2021 – October 31, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
September 1, 2021 – September 30, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
August 1, 2021 – August 31, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 1, 2021 – July 31, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
June 1, 2021 – June 30, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
May 1, 2021 – May 31, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
April 1, 2021 – April 30, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
March 1, 2021 – March 31, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
February 1, 2021 – February 28, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
January 1, 2021 – January 31, 2021	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
December 1, 2020 – December 31, 2020	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
November 1, 2020 – November 30, 2020	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 1, 2020 – July 31, 2020	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
April 1, 2020 – April 30, 2020	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
March 1, 2020 – March 31, 2020	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
February 1, 2020 – February 29, 2020	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
January 1, 2020 – January 31, 2020	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
December 1, 2019 – December 31, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
November 1, 2019 – November 30, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 2019 – October 31, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
September 1, 2019 – September 30, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 1, 2019 – July 31, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
June 1, 2019 – June 30, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
May 1, 2019 – May 31, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
January 1, 2019 – January 31, 2019	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
November 1, 2018 – November 30, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 2018 – October 31, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
September 1, 2018 – September 30, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
August 1, 2018 – August 31, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 1, 2018 – July 31, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
June 1, 2018 – June 30, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
May 1, 2018 – May 31, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
April 1, 2018 – April 30, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
March 1, 2018 – March 31, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
February 1, 2018 – February 28, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
January 1, 2018 – January 31, 2018	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
August 1, 2017 – August 31, 2017	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Archived
February 1, 2017 – February 28, 2017	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Archived
July 15, 2016 – October 14, 2016	Variance/Exemption/Other Compliance	—	—	Resolved
June 30, 2016 – September 29, 2016	Variance/Exemption/Other Compliance	—	—	Resolved
February 5, 2016 – May 4, 2016	Variance/Exemption/Other Compliance	—	—	Resolved
March 1, 2015 – March 31, 2015	Monitoring of Treatment (SWTR-Unfilt/GWR)	Groundwater Rule	—	Resolved
October 1, 2014 – October 31, 2014	Monitoring of Treatment (SWTR-Unfilt/GWR)	Groundwater Rule	—	Resolved
August 1, 2012 – August 31, 2012	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
September 1, 1984 – September 30, 1984	Notification, Public	—	—	Archived
August 1, 1984 – August 31, 1984	Notification, Public	—	—	Archived
July 1, 1984 – July 31, 1984	Notification, Public	—	—	Archived
April 1, 1983 – April 30, 1983	Notification, Public	—	—	Archived
April 1, 1983 – April 30, 1983	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
March 1, 1983 – March 31, 1983	Notification, Public	—	—	Archived
March 1, 1983 – March 31, 1983	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
January 1, 1983 – January 31, 1983	Notification, Public	—	—	Archived
January 1, 1983 – January 31, 1983	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
December 1, 1982 – December 31, 1982	Notification, Public	—	—	Archived
December 1, 1982 – December 31, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
November 1, 1982 – November 30, 1982	Notification, Public	—	—	Archived
November 1, 1982 – November 30, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 6, 1982 – August 5, 1983	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 1982 – October 31, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 1982 – October 31, 1982	Notification, Public	—	—	Archived
September 8, 1982 – October 7, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
August 3, 1982 – September 2, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
May 5, 1982 – June 4, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
April 6, 1982 – May 5, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
March 4, 1982 – May 3, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
February 3, 1982 – April 2, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
December 3, 1981 – February 2, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
November 4, 1981 – March 3, 1982	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
October 1, 1981 – September 30, 1982	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

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

Enforcement actions

February 1, 2019State Compliance achieved7 linked violations
March 9, 2018State Administrative/Compliance Order without penalty issued4 linked violations
December 19, 2017State Administrative/Compliance Order without penalty issued55 linked violations
September 26, 2017State Administrative/Compliance Order without penalty issued3 linked violations
May 25, 2017State Administrative/Compliance Order without penalty issued2 linked violations
April 30, 2015State Administrative/Compliance Order without penalty issued7 linked violations
April 30, 2015State Compliance achieved3 linked violations
December 30, 2012State Compliance achieved2 linked violations

Contact

FARMER, MILES

831-920-6796

CASTROVILLE, CA 95012