California Integrated Water Quality System (CIWQS 20.5)


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	California Integrated Water Quality System Project (CIWQS)

Facility At-A-Glance Report

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Place ID 271781

General Information
Region	Place ID	Place Name	Place Type	Place Address	Place County
5S	271781	City of Lathrop Consolidated Treatment Facility	Wastewater Treatment Facility	18800 Christopher Lathrop, CA, 95330	San Joaquin

Related Parties

Party	Party Type	Party Name	Role	Classification	Relationship Start Date	Relationship End Date
641583	Person	Jonah Sonner	Is A Data Submitter For		09/28/2023
634465	Person	Cyle Moon	Is A Data Submitter For		07/20/2022
498390	Person	Gregory Gibson	Is A Data Submitter For		06/15/2022
545167	Person	Michael King	Is Onsite Manager For		06/09/2022
545167	Person	Michael King	Contact		12/13/2021
488557	Person	Paul Zolfarelli	Contact		12/13/2021
498386	Person	Stephen Salvatore	Contact		04/21/2016	03/24/2021
545974	Organization	Veolia North America	Operator	Privately-Owned Business	02/05/2015
522969	Person	Joseph Reyes	Contact		04/01/2014	03/24/2021
25593	Organization	Lathrop City	Owner	City Agency	09/22/2006
8682	Organization	Lathrop City/Califia LLC	Owner	Privately-Owned Business	07/07/2004	09/21/2006

Total Related Parties: 11

Regulatory Measures

Reg Measure ID	Reg Measure Type	Region	Program	Order No.	WDID	Effective Date	Expiration Date	Status	Amended?
445985	NPDES Permit	5S	NPDMUNILRG	R5-2022-0004	5B39NP00085	04/01/2022	03/31/2027	Active	N
440476	Co-Permitee	SB	SLIC	2020-0015-DWQ	5B391076001	07/09/2020		Active	N
438719	Enrollee - WDR	5S	REC	2016-0068-DDW	5B39NC00300	06/09/2020	08/05/2026	Active	N
395597	WDR	5S	WDRMUNILRG	R5-2016-0028-02	5B391076001	04/21/2016	04/21/2026	Historical	Y
395536	WDR	5S	WDRMUNILRG	R5-2015-0006	5B39NC00042	02/05/2015	02/05/2025	Historical	N
329059	WDR	5S	WDRMUNILRG	R5-2006-0094	5B39NC00042	09/22/2006	03/17/2015	Historical	N
133318	WDR	5S	WDRMUNILRG	05-045	5B39NC00042	03/17/2005	03/17/2015	Historical	N

Total Reg Measures: 7

Violations

Violation ID	Occurred Date	Violation Type	(-) Violation Description	Corrective Action	Status	Classification	Source
1140636	01/04/2025	DMON	The minimum monitoring requirement for EFF-002 pH and temperature (3/week within a week with a federal holiday) was not met for the week ending on January 4, 2025. While the City originally scheduled for monitoring to occur early in the week, the City had to reschedule for the contract laboratory (Fruit Growers' Laboratory) to conduct EFF-002 pH and temperature monitoring on January 2-4, 2025 due to operational challenges. The City coordinated with their contract testing laboratory on January 2nd in an effort to ensure the testing would be completed as scheduled that week and was provided assurances that the sampling had been completed and the pH measurements were within range. On January 27th, the contract lab communicated that despite this being scheduled in advance, the lab's field sampler missed the third sample that week on January 4, 2025 and instead collected it on January 5, 2025. This sample date fell outside of the weekly period and thus, only two samples for pH and temperature were collected at EFF-002 that week.	The week ending January 4th was the final week that the City planned for the contract laboratory to collect field measurements at EFF-002. During November and December 2024, the City prepared City operations staff, its metering equipment, and a quality assurance-quality control manual to start collecting the EFF-002 measurements themselves and prevent further non-compliance. January 6, 2025 was selected as the start date for City staff to take over EFF-002 monitoring because this followed scheduled City office closures during the holidays. Now that the City is conducting this testing, it does not expect this type of scheduling error to occur in the future.	Violation	U	eSMR
1139558	12/10/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.5 SU at EFF-002.	After receiving notification of the pH exceedance by the City's contract laboratory, operational staff were able to cease discharge to the river within 30 minutes of the measurement being taken. Flow continued to be diverted to the reclamation system until the following day when process control sampling showed the cooling pond pH to be within the acceptable range again. In response to the December 10, 2024, pH exceedance, the City made operational changes to blend water from the cooling pond with fresh dechlorinated effluent prior to discharging to San Joaquin River. This operational change was implemented on December 23, 2024.	Violation	B	eSMR
1139557	12/06/2024	OEV	pH Instantaneous Minimum limit is 6.5 SU and reported value was 6.3 SU at EFF-002.	Originally, this measurement was thought to be a result of a sampling error. After investigation by the City, the result was confirmed to be valid and was thus reported as an exceedance. Because of this delay, no immediate operational changes were made to the discharge. Corrective action taken as a result of the December 6, 2024, pH exceedance, the City made operational changes to blend water from the cooling pond with fresh dechlorinated effluent prior to discharging to San Joaquin River. This operational change was implemented on December 23, 2024.	Violation	B	eSMR
1129071	05/23/2024	CAT2	Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 0.57 mg/L at EFF-001.	The closed SBS dosing valve was reopened upon discovery. Additionally, the causes of this violation have been discussed with CTF operations staff and staff have been trained on proper protocol for SBS dosing and valve controls.	Violation	B	eSMR
1126624	03/31/2024	OEV	pH Instantaneous Minimum limit is 6.5 SU and reported value was 6.3 SU at EFF-001.	The setpoint error was corrected upon discovery and has been correctly set to 6.5 SU.	Violation	B	eSMR
1126621	03/28/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.1 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126616	03/27/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126617	03/26/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126615	03/25/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126613	03/22/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126614	03/21/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126606	03/20/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126620	03/14/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.1 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126619	03/13/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.2 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126623	03/12/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126622	03/11/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.4 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126618	03/08/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126612	03/07/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126625	03/06/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126609	03/05/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126611	03/04/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.7 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126608	03/01/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1126610	03/01/2024	CAT2	Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 0.038 mg/L at EFF-001.	The City regrets this violation having occurred and has implemented additional SCADA controls and operations staff training to prevent this from happening in the future.	Violation	B	eSMR
1126607	03/01/2024	CAT2	Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 0.197 mg/L at EFF-001.	The City regrets this violation having occurred and has implemented additional SCADA controls and operations staff training to prevent this from happening in the future.	Violation	B	eSMR
1125418	02/29/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125420	02/28/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.4 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125427	02/27/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.1 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125417	02/26/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 9.3 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125425	02/23/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.7 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125423	02/22/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125426	02/21/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.6 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125422	02/20/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.8 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125419	02/19/2024	OEV	pH Instantaneous Maximum limit is 8.5 SU and reported value was 8.9 SU at EFF-002.	The City is evaluating ways to operate the cooling ponds in the immediate future to prevent these violations.	Violation	B	eSMR
1125416	02/04/2024	CAT2	Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.019 mg/L and reported value was 0.041 mg/L at EFF-001.	The City regrets this violation having occurred and has implemented additional SCADA controls and operations staff training to prevent this from happening in the future.	Violation	B	eSMR
1122936	11/13/2023	Order Conditions	Filter effluent turbidity exceeded 0.2 NTU for 6% of the 24-hour period on 11/13, violating the recycling specifications.	On November 14, it was discovered that one of the modules in MBR Train 1 caused the exceedance and this module was taken out of operation. This module remains out of operation until additional repairs can be made. Effluent turbidity did not exceed the Recycling Specifications for the remainder of the reporting period after these actions. Despite these turbidity challenges, the CTF continued to achieve adequate disinfection, with effluent total coliform measuring <1.8 MPN/100mL on November 13, 2023.	Violation	B	eSMR
1121482	09/14/2023	Order Conditions	Filter effluent turbidity exceeded 0.2 NTU for 7% of the 24-hour period on 9/14, violating the recycling specifications.	Operational controls at the Consolidated Treatment Facility cause the plant to automatically divert Membrane Bioreactor (MBR) effluent to the Emergency Storage Basin if the turbidity Recycling Specifications are not met. However, during preparation of the August 2023 eSMR, it was discovered that these operational controls had temporarily been disabled for scheduled operational testing at the Consolidated Treatment Facility in ongoing efforts to prepare it for discharging to the San Joaquin River. Though the controls were re-enabled once this discovery was made, it was later discovered that PLC/SCADA programming was needed to fully rectify the turbidity exceedances. This programming issue was resolved on October 12, 2023, and the controls have since been re-enabled. Review of operational data since resolution of the programming issue indicates that these controls are currently functioning as intended. Despite these turbidity challenges, the Consolidated Treatment Facility continued to achieve adequate disinfection, with effluent Total Coliform measuring <1.8 MPN/100mL on September 14th, 2023.	Violation	B	eSMR
1121483	09/13/2023	Order Conditions	Filter effluent turbidity exceeded 0.2 NTU for 9% of the 24-hour period on 9/13, violating the recycling specifications.	Operational controls at the Consolidated Treatment Facility cause the plant to automatically divert Membrane Bioreactor (MBR) effluent to the Emergency Storage Basin if the turbidity Recycling Specifications are not met. However, during preparation of the August 2023 eSMR, it was discovered that these operational controls had temporarily been disabled for scheduled operational testing at the Consolidated Treatment Facility in ongoing efforts to prepare it for discharging to the San Joaquin River. Though the controls were re-enabled once this discovery was made, it was later discovered that PLC/SCADA programming was needed to fully rectify the turbidity exceedances. The programming issue was resolved on October 12, 2023, and the controls have since been re-enabled. Review of operational data since resolution of the programming issue indicates that these controls are currently functioning as intended. Despite these turbidity challenges, the Consolidated Treatment Facility continued to achieve adequate disinfection, with effluent Total Coliform measuring <1.8 MPN/100mL on September 13, 2023.	Violation	B	eSMR
1120672	08/27/2023	Order Conditions	Filter effluent turbidity exceeded 0.2 NTU for 25% of the 24-hour period on 8/27, violating the recycling specifications.	Operational controls at the Consolidated Treatment Facility cause the plant to automatically divert MBR effluent to the Emergency Storage Basin if the turbidity Recycling Specifications are not met. However, it was discovered that these operational controls had been temporarily disabled for scheduled operational testing at the Consolidated Treatment Facility in ongoing efforts to prepare it for discharging to the San Joaquin River. These controls have since been re-enabled. Despite these turbidity challenges, the Consolidated Treatment Facility continued to achieve adequate disinfection, with effluent Total Coliform measuring <1.8 MPN/100mL on August 27, 2023.	Violation	B	eSMR
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.

Total Violations: 38

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
CAT2 = Category 2 Pollutant (Effluent Violation for Group 2 Pollutant)	DMON = Deficient Monitoring
Order Conditions = Order Conditions	OEV = Other Effluent Violation

Enforcement Actions

Enf Id	Enf Type	Enf Order No.	Effective Date	Status
459991	Notice of Violation	null	02/13/2025	Historical
458011	Notice of Violation	null	08/09/2024	Historical
457148	Notice of Violation	null	06/03/2024	Historical
455909	Notice of Violation	null	02/23/2024	Historical
455107	Notice of Violation	null	11/28/2023	Historical

Total Enf Actions: 5

Inspections

Inspection ID	Inspection Type	Lead Inspector	Actual End Date	Planned	Violations	Attachment
55470073	B Type compliance inspection	Jon Rohrbough	04/23/2024	Y	0	[Attachments]
45482534	Pretreatment compliance	Mohammad Farhad	07/14/2021	N	0	Download
38238716	Prerequirement inspection	Dina Calanchini	10/10/2019	N	0	N/A
36430604	Prerequirement inspection	Dina Calanchini	05/17/2019	N	0	[Attachments]
33378663	Miscellaneous inspection	Brendan Kenny	07/27/2018	N	0	N/A
15311633	B Type compliance inspection	Brendan Kenny	01/22/2014	N	0	N/A
2063176	Miscellaneous inspection	Brendan Kenny	02/02/2010	N	0	N/A

Total Inspections: 7

Last Inspection: 04/23/2024

The current report was generated with data as of: 04/24/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.

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