General Information Party ID Party Name Party Classification Mailing Address Work Phone Email/Website 535574 Christian Kessler null 15600 Sand Canyon Avenue Irvine, CA null lessler@irwd.com Related Places Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date Related Parties Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification 499770 Irvine Ranch Water District Organization Legally Responsible Official 12/05/2011 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 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 458795 Irvine Ranch Water District Enrollee - 401 Certification CERFILLEXC 11/22/2024 Historical 455413 Irvine Ranch Water District Enrollee - 401 Certification CERFILLEXC 01/11/2024 Active 451099 Irvine Ranch Water District Enrollee - 401 Certification CERFILLEXC 01/31/2023 Historical 447102 Irvine Ranch Water District Enrollee - 401 Certification CERFILLEXC 04/18/2022 Historical 442012 Irvine Ranch Water District 401 Certification CERFILLEXC 08/27/2021 Active 440351 Irvine Ranch Water District Co-Permitee SLIC 07/09/2020 Active 417050 Irvine Ranch Water District Enrollee - 401 Certification CERFILLEXC 03/05/2017 Historical 417016 Irvine Ranch Water District Enrollee - NPDES NPDMUNIOTH 07/01/2016 Active 402182 Irvine Ranch Water District NPDES Permit NPDMUNILRG 07/01/2015 Active 392057 Irvine Ranch Water District Enrollee - 401 Certification CERFILLEXC 01/14/2011 Historical 392056 Irvine Ranch Water District Enrollee - 401 Certification CERFILLEXC 01/16/2011 Historical 386727 Irvine Ranch Water District 401 Certification CERFILLEXC 07/23/2003 Historical 386668 Irvine Ranch Water District 401 Certification CERFILLEXC 09/22/2006 Historical 386655 Irvine Ranch Water District 401 Certification CERFILLEXC 02/07/2007 Historical 386637 Irvine Ranch Water District 401 Certification CERFILLEXC 02/07/2007 Historical 386593 Irvine Ranch Water District 401 Certification CERFILLEXC 09/06/2011 Historical 386449 Irvine Ranch Water District 401 Certification CERFILLEXC 12/02/2008 Historical 386388 Irvine Ranch Water District 401 Certification CERFILLEXC 02/08/2007 Historical 386384 Irvine Ranch Water District 401 Certification CERFILLEXC 11/30/2005 Historical 386357 Irvine Ranch Water District 401 Certification CERFILLEXC 03/18/2004 Historical 386347 Irvine Ranch Water District 401 Certification CERFILLEXC 02/11/2004 Historical 385910 Irvine Ranch Water District 401 Certification CERFILLEXC 08/13/2002 Historical 385845 Irvine Ranch Water District 401 Certification CERFILLEXC 07/17/2001 Historical 380819 Irvine Ranch Water District 401 Certification CERFILLEXC 08/20/2009 Historical 380470 Irvine Ranch Water District 401 Certification CERFILLEXC null Active 380468 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 379851 Irvine Ranch Water District 401 Certification CERFILLEXC null Active 373738 Irvine Ranch Water District Enrollee - NPDES NPDNONMUNIPRCS 05/18/2010 Active 349491 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 349444 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 349442 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 348856 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 348467 Irvine Ranch Water District NPDES Permit NPDMUNILRG 11/30/2007 Historical 347054 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 339385 Irvine Ranch Water District Enrollee SSOMUNISML 05/02/2006 Active 338949 Irvine Ranch Water District Enrollee SSOMUNILRG 12/26/2007 Active 338942 Irvine Ranch Water District Enrollee SSOMUNISML 12/26/2007 Active 308686 Irvine Ranch Water District Co-Permitee WDR 04/26/2002 Historical 300551 Irvine Ranch Water District Enrollee SSOMUNILRG 11/17/2006 Active 298936 Irvine Ranch Water District Enrollee SSOMUNILRG 11/17/2006 Active 260458 Irvine Ranch Water District Letter WDR null Historical 260409 Irvine Ranch Water District Letter WDR null Historical 260399 Irvine Ranch Water District Letter WDR null Historical 260396 Irvine Ranch Water District Letter WDR null Historical 260340 Irvine Ranch Water District Letter WDR null Historical 260339 Irvine Ranch Water District Letter WDR null Historical 260328 Irvine Ranch Water District Letter WDR null Historical 260321 Irvine Ranch Water District Letter WDR null Historical 260300 Irvine Ranch Water District Letter NPDESWW null Historical 260237 Irvine Ranch Water District Letter WDR null Historical 260202 Irvine Ranch Water District Letter WDR null Historical 260198 Irvine Ranch Water District Letter WDR null Historical 260197 Irvine Ranch Water District Letter WDR null Historical 260028 Irvine Ranch Water District Letter NPDESWW 03/21/1990 Historical 259340 Irvine Ranch Water District Letter NPDESWW null Historical 214107 Irvine Ranch Water District Enrollee NPDNONMUNIPRCS 10/17/2002 Historical 213954 Irvine Ranch Water District Enrollee SSOMUNILRG 05/09/1996 Active 206324 Irvine Ranch Water District Enrollee - NPDES NPDNONMUNIPRCS 04/20/2005 Active 205889 Irvine Ranch Water District Enrollee NPDNONMUNIPRCS 06/14/1985 Historical 166348 Irvine Ranch Water District 401 Certification CERFILLEXC 11/29/2000 Historical 165644 Irvine Ranch Water District 401 Certification CERFILLEXC 10/11/2000 Historical 161185 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 161184 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 159994 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 159993 Irvine Ranch Water District 401 Certification CERFILLEXC null Historical 140835 Irvine Ranch Water District WDR WDR 10/11/1996 Historical 140507 Irvine Ranch Water District NPDES Permit NPDMUNILRG 04/17/1998 Historical 140426 Irvine Ranch Water District NPDES Permit NPDESWW 10/14/1994 Historical 140425 Irvine Ranch Water District NPDES Permit NPDMUNILRG 10/14/1994 Historical 139876 Irvine Ranch Water District WDR WDR 02/08/1991 Historical 139875 Irvine Ranch Water District Reclamation Requirements REC 06/07/1991 Historical 139874 Irvine Ranch Water District NPDES Permit NPDMUNILRG 06/07/1991 Historical 139202 Irvine Ranch Water District NPDES Permit NPDESWW 02/14/1986 Historical 138719 Irvine Ranch Water District NPDES Permit NPDNONMUNIPRCS 06/14/1985 Historical 138578 Irvine Ranch Water District WDR WDR 09/11/1981 Historical 137871 Irvine Ranch Water District WDR NPDESWW 09/11/1981 Historical 136935 Irvine Ranch Water District NPDES Permit NPDMUNILRG 04/09/1976 Historical 132117 Irvine Ranch Water District WDR WDR 04/26/2002 Historical 131681 Irvine Ranch Water District WDR WDRMUNIOTH 07/19/2002 Historical 131152 Irvine Ranch Water District NPDES Permit NPDMUNILRG 12/19/2001 Historical