General Information Party ID Party Name Party Classification Mailing Address Work Phone Email/Website 513638 Contra Costa Water Authority (a Partnership) Government Agency Combination Po Box H2o Concord, CA 94524 925-688-8034 null Related Places Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date 789714 Leon Drive Automatic Flushing System Project Contra Costa 5S Dredge/Fill Site Owner 01/07/2013 null 251745 Randall Bold WTP Contra Costa 5S Water Treatment Plant Owner 12/27/2007 null Related Parties Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification 528320 Mark Seedall Person Legally Responsible Official 01/07/2013 null null 9313 Contra Costa Water District Organization Division Of 12/27/2007 null Special District Regulatory Measures(non-enforcement) Reg. Measure ID Regulatory Measure Type Region WDID Title Status Program Order No. RM Effective Date RM Termination Date Relationship Relationship Start Date Relationship End Date 388703 401 Certification 5S 5B07CR00139 WQC 12/28/2012 for Contra Costa Water; Leon Dr. Automatic Flushing System Proj Historical CERFILLEXC null 12/28/2012 10/09/2013 Discharger 01/07/2013 null 176100 WDR 5S 5B07NC00013 WDR R5-2007-0048 for Contra Costa Water District, Randall Bold WTP Active WDRNONMUNIPRCS R5-2007-0048 05/04/2007 null Discharger 12/27/2007 null Violations within the past calendar year Violation ID Occurrence Date Violation Type Violation Description Violation Status Priority Source Facility Name Violated Reg. Meas. ID Violated Reg. Meas. Order No. Linked To Enf. Enforcement Actions Enforcement ID Enforcement Type Enf. Order No. Title Program Effective Date Status Regulatory Measures linked to Related Parties Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status 141019 Contra Costa Water District NPDES Permit NPDESWW 05/20/1987 Historical 460533 Contra Costa Water District Enrollee - 401 Certification CERREST 04/11/2025 Active 142293 Contra Costa Water District NPDES Permit NPDESWW 05/20/1992 Historical 145548 Contra Costa Water District NPDES Permit NPDESWW 03/17/1982 Historical 146609 Contra Costa Water District WDR WDRMUNIOTH 01/16/1985 Active 176100 Contra Costa Water District WDR WDRNONMUNIPRCS 05/04/2007 Active 194722 Contra Costa Water District Enrollee WDR 05/30/1995 Historical 194727 Contra Costa Water District Enrollee NPDNONMUNIPRCS 01/30/2001 Historical 194730 Contra Costa Water District Enrollee - NPDES NPDNONMUNIPRCS 12/23/2013 Active 194735 Contra Costa Water District Enrollee NPDNONMUNIPRCS 10/15/2003 Historical 259532 Contra Costa Water District NPDES Permit NPDESWW 06/12/1997 Historical 259815 Contra Costa Water District Letter WDR 01/12/1996 Historical 327423 Contra Costa Water District Enrollee NPDNONMUNIPRCS 03/30/2006 Historical 328150 Contra Costa Water District Enrollee NPDNONMUNIPRCS 05/27/2004 Historical 340045 Contra Costa Water District Waiver WDRNONMUNIPRCS 12/06/2007 Historical 349265 Contra Costa Water District Waiver WDRNONMUNIPRCS 03/14/2007 Historical 367325 Contra Costa Water District Enrollee WDRNONMUNIPRCS 06/16/2009 Historical 367756 Contra Costa Water District Individual Monitoring Requirem WDR 06/16/2009 Active 368423 Contra Costa Water District Enrollee WDRNONMUNIPRCS 07/08/2009 Historical 373650 Contra Costa Water District Enrollee NPDNONMUNIPRCS 03/30/2010 Historical 376713 Contra Costa Water District 401 Certification CERFILLEXC 03/04/2011 Historical 377573 Contra Costa Water District Enrollee NPDNONMUNIPRCS 11/23/2010 Historical 380702 Contra Costa Water District 401 Certification CERFILLEXC 08/24/2009 Historical 391349 Contra Costa Water District Enrollee - NPDES NPDNONMUNIPRCS 06/12/2013 Historical 391454 Contra Costa Water District 401 Certification CERDREDGE 11/10/2011 Historical 391675 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 07/25/2012 Historical 391712 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 07/25/2012 Historical 391835 Contra Costa Water District Enrollee - WDR WDRNONMUNIPRCS 06/19/2013 Active 392852 Contra Costa Water District 401 Certification CERFILLEXC 10/07/2013 Active 393329 Contra Costa Water District 401 Certification CERFILLEXC 08/01/2014 Historical 395691 Contra Costa Water District Enrollee - NPDES NPDMUNIOTH 04/14/2014 Historical 396659 Contra Costa Water District Enrollee - NPDES NPDNONMUNIPRCS 12/23/2013 Historical 396659 Contra Costa Water District Enrollee - NPDES NPDNONMUNIPRCS 12/23/2013 Historical 403674 Contra Costa Water District 401 Certification CERFILLEXC 03/08/2016 Historical 411656 Contra Costa Water District 13267 Letter (Non-Enforcement) NPDNONMUNIPRCS 01/20/2017 Active 413904 Contra Costa Water District Enrollee - NPDES NPDNONMUNIPRCS 06/19/2017 Active 416677 Contra Costa Water District Enrollee - NPDES NPDNONMUNIPRCS 07/01/2016 Active 416912 Contra Costa Water District Enrollee - NPDES NPDNONMUNIPRCS 07/01/2016 Active 428162 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 06/19/2019 Historical 433560 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 02/17/2020 Historical 434097 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 10/18/2019 Historical 441935 Contra Costa Water District 401 Certification CERFILLEXC 06/30/2022 Historical 443760 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 07/30/2021 Active 453646 Contra Costa Water District 401 Certification CERFILLEXC 10/27/2023 Active 453883 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 08/29/2023 Historical 454695 Contra Costa Water District Enrollee - 401 Certification CERFILLEXC 11/16/2023 Historical 459507 Contra Costa Water District 401 Certification CERFILLEXC 02/06/2025 Active 142279 Contra Costa Water District NPDES Permit NPDESWW 08/19/1998 Historical