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California Integrated Water Quality System Project (CIWQS)
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Place ID 219223 		  
  
  
  
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General Information
Region Place ID Place Name Place Type Place Address Place County
5S 219223 City of Davis WWTP Wastewater Treatment Facility 45400 County Road 28H Davis, CA, 95776 Yolo
Expand/Contract Related Parties
Related Parties
Party Party Type Party Name Role Classification Relationship Start Date Relationship End Date
574338 Person Sandra Macomb Is Onsite Manager For 03/20/2025
649341 Person Jon St.Onge Is A Data Submitter For 02/21/2025
645814 Person Jeffrey Noller Is A Data Submitter For 06/18/2024
623037 Person Jeromy Miller Is A Data Submitter For 03/25/2021 06/14/2023
574338 Person Sandra Macomb Contact 10/03/2018
554821 Person Ruth Boynton Whiting Is A Data Submitter For 02/26/2016 09/30/2025
489551 Person John Alexander Is Onsite Manager For 07/06/2015
391643 Person Stanley Gryczko Is Onsite Manager For 12/02/2013
522657 Person Nika Nami Is A Data Submitter For 05/24/2010
522118 Person Aubrey Livingston Is A Data Submitter For 04/21/2010 03/25/2021
522033 Person Josefina Tellers Is A Data Submitter For 04/12/2010
72070 Person Keith Smith Is Onsite Manager For 04/12/2010 08/30/2012
108425 Person Jim Beatty Contact 10/25/2007
72070 Person Keith Smith Contact 10/25/2007
12331 Organization Davis City Owner City Agency 07/14/1995
Total Related Parties: 15
Expand/Contract Regulatory Measures
Regulatory Measures
Reg Measure ID Reg Measure Type Region Program Order No. WDID Effective Date Expiration Date Status Amended?
462599 Enrollee - WDR 5S REC 2016-0068-DDW 5A57NC00070 09/22/2025 Active N
461835 NPDES Permit 5S NPDMUNILRG R5-2025-0026 5A570100001 08/01/2025 07/31/2030 Active N
440451 Co-Permitee SB SLIC 2020-0015-DWQ 5A570100001 07/09/2020 Active N
428211 NPDES Permit 5S NPDMUNILRG R5-2018-0086 5A570100001 02/01/2019 01/31/2024 Historical N
393808 NPDES Permit 5S NPDMUNILRG R5-2013-0127 5A570100001 11/23/2013 11/01/2018 Historical Y
339942 NPDES Permit 5S NPDMUNILRG R5-2007-0132 5A570100001 12/14/2007 10/01/2012 Historical N
365996 NPDES Permit 5S NPDMUNILRG R5-2007-0132-01 5A570100001 12/14/2007 10/01/2012 Historical Y
148419 NPDES Permit 5S NPDMUNILRG R5-2001-0067 5A570100001 03/16/2001 03/15/2006 Historical N
147075 NPDES Permit 5S NPDMUNILRG 99-014 5A570100001 04/29/1999 10/01/2000 Historical N
145905 NPDES Permit 5S NPDMUNILRG 95-235 5A570100001 10/27/1995 10/01/2000 Historical N
141438 NPDES Permit 5S NPDMUNILRG 90-002 5A570100001 01/26/1990 01/01/1995 Historical N
139786 NPDES Permit 5S NPDMUNILRG 85-278 5A570100001 10/25/1985 10/01/1990 Historical N
139465 NPDES Permit 5S NPDMUNILRG 80-113 5A570100001 09/12/1980 Historical N
Total Reg Measures: 13
Expand/Contract Violations
Violations
Violation ID Occurred Date Violation Type (-) Violation Description Corrective Action Status Classification Source
1150139 11/30/2025 DMON Laboratory missed November 2025 monthly monitoring of Total Cu, Total CN, Hardness & Dissolved Oxygen from Discharge point 001. Laboratory has instituted a scheduling calendar to assure samples are collected and is currently developing a sample scheduler in our LIMs system to assure this omission does not reoccur. Violation B eSMR
1149028 10/21/2025 LREP Annual SMR ( TECHRPT ) (Annual Progress Report for Methylmercury (WDR VI.C.7.a.iv.1)) report for 2024 (2393607) was due on 20-OCT-25 Violation B Report
1135182 10/21/2024 LREP Annual SMR ( TECHRPT ) (Annual Progress Report for Methylmercury (WDR VI.C.7.a.iv.1)) report for 2023 (2393600) was due on 20-OCT-24 Violation B Report
1130260 06/24/2024 CTOX Chronic Toxicity-C.dubia-Reproduction 3-Month Median limit is 1 TUc and reported value was 13 TUc at EFF-001. Initiated site specific TRE. Violation U eSMR
1128966 05/06/2024 OEV Total Coliform Daily Maximum limit is 240 MPN/100 mL and reported value was 920 MPN/100 mL at EFF-001. The cause was investigated, and staff was unable to identify a specific cause. Violation B eSMR
1114068 01/18/2023 OEV Total Coliform 7-Day Median limit is 2.2 MPN/100 mL and reported value was 8 MPN/100 mL at EFF-001. The sample location has changed for titrations and analyzer calibrations. Also, a second contact tank has been put into service to increase the chlorine contact and detention time. Violation B eSMR
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 6 Priority Violations: 0
*Click the "(+/-) Violation Description" link to expand and contract the violation description.
*As of 5/20/2010, the Water Board's Enforcement Policy requires that all violations be classified as 1, 2 or 3, with class 1 being the highest. Prior to this, violations were simply classified as Yes or No. If a 123 classification has been assigned to a violation that occurred before this date, that classification data will be displayed instead of the Yes/No data.
Violation Types
CTOX = Chronic Toxicity DMON = Deficient Monitoring
LREP = Late Report OEV = Other Effluent Violation
Expand/Contract Enforcement Actions
Enforcement Actions
Enf Id Enf Type Enf Order No. Effective Date Status
464471 Notice of Violation null 03/03/2026 Historical
461833 Time Schedule Order R5-2025-0033 08/01/2025 Active
458885 Notice of Violation null 10/22/2024 Historical
453519 Notice of Violation null 06/08/2023 Historical
445589 Admin Civil Liability R5-2021-0527 01/27/2022 Historical
444724 Notice of Violation null 08/06/2021 Historical
443085 Notice of Violation null 04/23/2021 Historical
445087 Notice of Violation null 03/23/2021 Historical
445088 Notice of Violation null 09/14/2020 Historical
435813 Admin Civil Liability R5-2019-0532 11/18/2019 Historical
434750 Notice of Violation null 10/02/2019 Historical
433397 Notice of Violation null 08/02/2019 Historical
422315 Notice of Violation 06/22/2018 Historical
416206 Admin Civil Liability R5-2017-0547 10/03/2017 Historical
414935 Notice of Violation 07/27/2017 Historical
412540 Notice of Violation 03/29/2017 Historical
409902 Notice of Violation 10/12/2016 Historical
409096 Admin Civil Liability R5-2016-0555 09/27/2016 Historical
407845 Notice of Violation 07/20/2016 Historical
407627 Notice of Violation 06/07/2016 Historical
405418 Admin Civil Liability R5-2016-0515 04/21/2016 Historical
406344 Notice of Violation 01/15/2016 Historical
400188 Admin Civil Liability R5-2015-0513 03/12/2015 Historical
400017 Notice of Violation 02/24/2015 Historical
399262 Notice of Violation 12/16/2014 Historical
399192 Time Schedule Order R5-2014-0159 12/05/2014 Historical
398009 Admin Civil Liability R5-2014-0552 10/08/2014 Historical
396719 Notice of Violation 06/04/2014 Historical
394675 Notice of Violation 01/23/2014 Historical
393810 Time Schedule Order R5-2013-0128 10/04/2013 Active
390607 Notice of Violation 06/06/2013 Historical
390086 Notice of Violation 04/24/2013 Historical
389135 Notice of Violation 02/13/2013 Historical
388967 Admin Civil Liability R5-2013-0507 01/11/2013 Historical
387902 Notice of Violation 10/23/2012 Historical
386612 Notice of Violation 07/20/2012 Historical
385633 Notice of Violation 06/19/2012 Historical
385254 Notice of Violation 05/21/2012 Historical
384676 Staff Enforcement Letter null 04/10/2012 Historical
384348 Notice of Violation 04/06/2012 Historical
382647 Notice of Violation 12/28/2011 Historical
381752 Notice of Violation 09/29/2011 Historical
379783 Notice of Violation 06/13/2011 Historical
379658 Notice of Violation 05/27/2011 Historical
378731 Notice of Violation 04/20/2011 Historical
377646 Notice of Violation 02/10/2011 Historical
376597 Notice of Violation 11/09/2010 Historical
376562 Admin Civil Liability R5-2010-0550 11/04/2010 Historical
376400 Notice of Violation 10/26/2010 Historical
376169 Notice of Violation 10/01/2010 Historical
375960 Notice of Violation 09/20/2010 Historical
375155 Notice of Violation 07/22/2010 Historical
374776 Notice of Violation 06/15/2010 Historical
373761 Time Schedule Order R5-2010-0029 03/18/2010 Historical
368824 Notice of Violation 07/13/2009 Historical
354911 Admin Civil Liability R5-2008-0601 11/10/2008 Historical
Total Enf Actions: 56
Expand/Contract Inspections
Inspections
Inspection ID Inspection Type Lead Inspector Actual End Date Planned Violations Attachment
62865743 Pretreatment compliance Paul Wadding 01/29/2026 N 0 N/A
56424438 B Type compliance inspection Paul Wadding 06/21/2024 N 0 Download
47660400 B Type compliance inspection Paul Wadding 04/27/2022 N 0 Download
40499655 B Type compliance inspection Paul Wadding 05/27/2020 N 0 Download
30325450 B Type compliance inspection Ayda Soltani 10/17/2017 Y 0 [Attachments]
25558669 B Type compliance inspection Alejandra Serratos 08/17/2016 N 0 Download
25810168 Pretreatment compliance Christine Wong 12/09/2015 N 0 Download
18687227 B Type compliance inspection Lucio Orellana 12/17/2014 N 0 Download
15956704 Preatment Audit EPA Contractor 10/16/2013 N 0 Download
12119788 B Type compliance inspection Matthew Reusswig 02/19/2013 N 0 N/A
8609579 B Type compliance inspection Lucio Orellana 05/30/2012 N 0 N/A
7982005 Complaint inspection Julie Berrey (Multiple) 06/21/2011 N 1 N/A
4400625 B Type compliance inspection Michael A Fischer 04/22/2011 N 0 [Attachments]
4566396 Pretreatment compliance Brenner Perryman 04/06/2011 N 0 Download
1939091 B Type compliance inspection Oscar Biondi 09/25/2009 N 0 N/A
1772022 Pretreatment compliance Tetra Tech Inspector 03/19/2009 N 0 N/A
1772081 B Type compliance inspection Scott Slamal 01/22/2009 N 2 N/A
1482252 B Type compliance inspection Mark Amendola 04/30/2008 N 0 [Attachments]
1480033 Pretreatment compliance Ann Palmer 03/20/2008 Y 0 [Attachments]
1178836 B Type compliance inspection Kelly Jacques 05/24/2007 N 0 [Attachments]
1213848 B Type compliance inspection Barry Hilton (Multiple) 01/05/2007 N 0 [Attachments]
1028348 B Type compliance inspection Craig Simmons 05/10/2006 N 0 [Attachments]
336125 Pretreatment compliance Tetra Tech 5S-NPDES 09/16/2004 Y 0 N/A
330793 Pretreatment compliance Kathleen Harder 03/10/2003 Y 0 N/A
325295 B Type compliance inspection Kathleen Harder 06/20/2002 Y 0 N/A
310079 B Type compliance inspection Kathleen Harder 06/29/2001 Y 0 N/A
310078 B Type compliance inspection Kathleen Harder 02/29/2000 Y 0 N/A
310071 B Type compliance inspection Richard McHenry 04/20/1999 Y 0 N/A
310072 B Type compliance inspection Richard McHenry 06/17/1998 Y 0 N/A
310073 B Type compliance inspection Richard McHenry 06/30/1997 Y 0 N/A
310077 B Type compliance inspection Richard McHenry 06/26/1996 Y 0 N/A
310074 B Type compliance inspection Richard McHenry 06/27/1995 Y 0 N/A
310076 B Type compliance inspection Richard McHenry 06/15/1994 Y 0 N/A
310075 Miscellaneous inspection Richard McHenry 03/15/1994 Y 0 N/A
310080 A Type compliance inspection Richard McHenry 05/12/1993 Y 0 N/A
Total Inspections: 35 Last Inspection: 01/29/2026
  
The current report was generated with data as of: 03/24/2026
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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