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Place ID 259169
  
  
  
  
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General Information
Region Place ID Place Name Place Type Place Address Place County
8 259169 IEUA Regional Plant No. 5 Wastewater Treatment Facility 6068 Kimball C Chino, CA, 91710 San Bernardino

Expand/Contract Related Parties
Related Parties
Party Party Type Party Name Role Classification Relationship Start Date Relationship End Date
642994 Person Stephen Parker Is A Data Submitter For 12/11/2023
147335 Organization Inland Empire Utilities Agency Owner Special District 09/18/2020
579900 Person Christiana Daisy Is Onsite Manager For 01/06/2020
584685 Person Sarah Recinto Is A Data Submitter For 04/16/2019
577654 Person Eddie Lin Is A Data Submitter For 05/17/2018
541040 Person Randy Lee Is Onsite Manager For 02/06/2017 08/01/2023
550623 Person Pietro Cambiaso Is A Data Submitter For 04/01/2015
546361 Person Sylvie Lee Is Onsite Manager For 06/19/2014 03/08/2022
544318 Person Ernest Yeboah Is Onsite Manager For 12/02/2013 04/11/2017
532535 Person Chris Berch Is Onsite Manager For 04/04/2012 05/31/2019
532721 Person Craig Miller Is Onsite Manager For 04/03/2012 09/03/2013
147335 Organization Inland Empire Utilities Agency Owner and Operator Special District 02/27/2006
149707 Person Bonita Fan Is A Data Submitter For 02/06/2006
285855 Person Patrick Sheilds Is Onsite Manager For 02/02/2006 03/01/2013
Total Related Parties: 14

Expand/Contract Regulatory Measures
Regulatory Measures
Reg Measure ID Reg Measure Type Region Program Order No. WDID Effective Date Expiration Date Status Amended?
448253 NPDES Permit 8 NPDMUNILRG R8-2022-0041 8 362918001 08/01/2022 09/30/2027 Active N
440354 Co-Permitee SB SLIC 2020-0015-DWQ 8 362918001 07/09/2020 Active N
394393 NPDES Permit 8 NPDMUNILRG R8-2015-0036 8 362918001 11/01/2015 10/31/2020 Historical N
369778 NPDES Permit 8 NPDMUNILRG R8-2009-0021 8 362918001 07/20/2009 07/01/2014 Historical Y
354405 NPDES Permit 8 NPDMUNILRG R8-2008-0028 8 362744001 09/05/2008 09/01/2013 Historical N
132674 NPDES Permit 8 NPDMUNILRG R8-2003-0003 8 362744001 07/01/2003 07/01/2008 Historical Y
Total Reg Measures: 6

Expand/Contract Violations
Violations
Violation ID Occurred Date Violation Type (-) Violation Description Corrective Action Status Classification Source
1147838 08/31/2025 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-001A. Operations staff have performed bi-weekly lateral flushing's, replaced composite sampler tubing, cleaned composite sampler carboy, and disinfected the M-001A composite sampler. These actions have shown to mitigate against contamination as the M-001A toxicity has passed during the month of September 2025. Violation U eSMR
1145336 06/30/2025 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-001A. Operations staff flushed the laterals, disinfected the composite sampler (including the carboy), replaced the sampler tubing, and rinsed the sample bottles prior to collecting samples. The IEUA Toxicity Task Force will continue to evaluate the toxicity test results closely on a continuous basis. Violation U eSMR
1144239 04/30/2025 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-001A. In previous investigations, it was speculated that low flow (<2 mgd) at DP-001 could have caused disinfection byproduct formation due to additional contact time of organic matter and sodium hypochlorite in the pipeline. DP-001 is primarily comprised of RP-5 effluent and discharges of RP-5 effluent at DP-003 continues to pass chronic toxicity for reproduction during the same time that DP-001 has been failing. Additional flushing of the recycled water distribution system and laterals will be performed prior to future testing. IEUA will continue to evaluate the toxicity test results closely for the next few months. Violation U eSMR
1144246 04/30/2025 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-003. Operations staff will initiate dechlorination zone cleaning by flushing, draining, bleaching, and scrubbing the entire structure prior to future testing. Operations will ensure proper sampling techniques. Due to the possibility of bad batches of sample bottles, sample bottles will be triple rinsed to ensure there are no contaminants present. Construction of a permanent cover over the dechlorination zone commenced construction. Completion of the cover is anticipated over the next couple months with the intent that the cover will aid in mitigating any potential algae buildup in the dechlorination zone. IEUA Laboratory will begin the TIE to pinpoint the specific causes of toxicity. The IEUA Toxicity Task Force will continue to evaluate the toxicity test results closely for the next few months while working to eliminate the toxicity issue. Violation U eSMR
1144243 03/31/2025 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-003. Operations staff will initiate dechlorination zone cleaning by flushing, draining, bleaching, and scrubbing the entire structure prior to future testing. Operations will ensure proper sampling techniques. Due to the possibility of bad batches of sample bottles, sample bottles will be triple rinsed to ensure there are no contaminants present. Construction of a permanent cover over the dechlorination zone commenced construction. Completion of the cover is anticipated over the next couple months with the intent that the cover will aid in mitigating any potential algae buildup in the dechlorination zone. IEUA Laboratory will begin the TIE to pinpoint the specific causes of toxicity. The IEUA Toxicity Task Force will continue to evaluate the toxicity test results closely for the next few months while working to eliminate the toxicity issue. Violation U eSMR
1144237 02/28/2025 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-003. Please see "Chino Creek (M-003) IITRE (February 2024)" document in the February 2024 NPDES Report. Prado Lake DP 001 discharge is RP-5 Effluent. This monitoring location (M-001A) has been consistently passing the toxicity testing since September 2023. Routine recycled water distribution system flushing at key locations was implemented for DP 001 and reproduction toxicity at this site went away. The only significant differences between M-001A and M-003 are the dechlorination process and the distance traveled prior to discharge. In early March 2024, the RP-5 dechlorination basin was taken offline two days in a row for several hours to initiate the cleaning of walls and facilitate the passage of chlorine residual, which aids in algae removal. During the cleaning process, the water level rose sufficiently to enable a passive overflow into the Emergency Overflow Basin, effectively clearing out algae and debris from the dechlorination basin. At the time of reporting, IEUA is still interpreting the test results from the recent toxicity testing by the contract labs. Violation U eSMR
1144241 01/31/2025 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-001A. In previous investigations, it was speculated that low flow (<2 mgd) at DP-001 could have caused disinfection byproduct formation due to additional contact time of organic matter and sodium hypochlorite in the pipeline. DP-001 is primarily comprised of RP-5 effluent and discharges of RP-5 effluent at DP-003 continues to pass chronic toxicity for reproduction during the same time that DP-001 has been failing. Additional flushing of the recycled water distribution system and laterals will be performed prior to future testing. IEUA will continue to evaluate the toxicity test results closely for the next few months. Violation U eSMR
1138484 11/22/2024 Surface Water On November 22, 2024, the Chino Creek temperature was 28.5 degrees Celsius above the receiving water limitation of 26 degrees Celsius. The discharged temperature reported value was 27.1 degrees Celsius at RP-5 effluent. Due to the lack of Chino Creek upstream and CCWRF effluent data, it is difficult to conclude that the RP-5 effluent was not the cause of the exceedances. However, the Chino area had been experiencing warm weather in the month of November and the field testing took place in the afternoon. The higher ambient temperatures and the low flow in the concrete-lined portion of the channel could have caused the higher temperatures at the downstream creek location, R-003D. 1) All field testing of the sites listed in the above table will be conducted on the same day and approximately at the same time. This will provide a better data set to determine if effluent temperature is the cause of an exceedance and to know the background temperature upstream of the discharge points. 2) A work order has been entered to add continuous monitoring for the RP-5 and CCWRF effluent temperatures. This will align with how Regional Plant No. 1 is currently monitoring effluent temperature. 3) The Operations staff will notify Compliance staff when temperature exceedances occur. In addition to conducting periodic training, an electronic solution will need to be implemented to flag an exceedance once it is entered into the data logger. Violation U eSMR
1138483 11/13/2024 Surface Water On November 13, 2024, the Chino Creek temperature was 28.4 degrees Celsius above the receiving water limitation of 26 degrees Celsius. The discharged temperature reported value was 27.8 degrees Celsius at RP-5 effluent. Due to the lack of Chino Creek upstream and CCWRF effluent data, it is difficult to conclude that the RP-5 effluent was not the cause of the exceedances. However, the Chino area had been experiencing warm weather in the month of November and the field testing took place in the afternoon. The higher ambient temperatures and the low flow in the concrete-lined portion of the channel could have caused the higher temperatures at the downstream creek location, R-003D. 1) All field testing of the sites listed in the above table will be conducted on the same day and approximately at the same time. This will provide a better data set to determine if effluent temperature is the cause of an exceedance and to know the background temperature upstream of the discharge points. 2) A work order has been entered to add continuous monitoring for the RP-5 and CCWRF effluent temperatures. This will align with how Regional Plant No. 1 is currently monitoring effluent temperature. 3) The Operations staff will notify Compliance staff when temperature exceedances occur. In addition to conducting periodic training, an electronic solution will need to be implemented to flag an exceedance once it is entered into the data logger. Violation U eSMR
1144240 05/31/2024 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-001A. Please see "Prado Lake (001A) IITRE (May 2024)" document in the May 2024 NPDES Report.In previous investigations, it was speculated that low flow (<2 mgd) at DP-001 could have caused disinfection byproduct formation due to additional contact time of organic matter and sodium hypochlorite in the pipeline. DP-001 is primarily comprised of RP-5 effluent and discharges of RP-5 effluent at DP-003 continues to pass chronic toxicity for reproduction during the same time that DP-001 has been failing. Additional flushing of the recycled water distribution system and laterals will be performed prior to future testing. IEUA will continue to evaluate the toxicity test results closely for the next few months. Update: Toxicity was no longer found in June 2024 at M-001A. Violation U eSMR
1144238 03/31/2024 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-003. Please see "Chino Creek (M-003) IITRE (March 2024)" document in the March 2024 NPDES Report. Prado Lake DP 001 discharge is RP-5 Effluent. This monitoring location (M-001A) has been consistently passing the toxicity testing since September 2023. Routine recycled water distribution system flushing at key locations was implemented for DP 001 and reproduction toxicity at this site went away. The only significant differences between M-001A and M-003 are the dechlorination process and the distance traveled prior to discharge. In early March 2024, the RP-5 dechlorination basin was taken offline two days in a row for several hours to initiate the cleaning of walls and facilitate the passage of chlorine residual, which aids in algae removal. During the cleaning process, the water level rose sufficiently to enable a passive overflow into the Emergency Overflow Basin, effectively clearing out algae and debris from the dechlorination basin. Addition cleaning and flushing has taken place in April 2024. IEUA will continue to evaluate the effectiveness of the cleanings based on toxicity results in the coming months. Update: Toxicity was no longer found in April 2024 at M-003. Violation U eSMR
1144236 01/31/2024 CTOX Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at M-003. Please see "Chino Creek (M-003) IITRE (January 2024)" document in the January 2024 NPDES Report. Prado Lake DP 001 discharge is RP-5 Effluent. This monitoring location (M-001A) has been consistently passing the toxicity testing since September 2023. Routine recycled water distribution system flushing at key locations was implemented for DP 001 and reproduction toxicity at this site went away. The only significant differences between M-001A and M-003 are the dechlorination process and the distance traveled prior to discharge. Compliance staff has recommended the dechlorination basins at RP-5 be cleaned to eliminate the formation of disinfection byproducts or other compounds from the interaction of sodium hypochlorite with solid i the basin. Further investigation is necessary. Violation U eSMR
1121049 07/07/2023 CAT2 Chlorine, Total Residual Instantaneous Maximum limit is 0.1 mg/L and reported value was 3.3 mg/L at M-001A. The following items are completed action items to help mitigate potential future incidents of this nature. 1) MCC No.1 main circuit breaker replaced. 2) Emergency onsite generator test completed after MCC No. 1 main circuit breaker replacement. Emergency onsite generator turned on seamlessly and provided the necessary power to the SBS pumps when the main utility power was disconnected. Violation U eSMR
1115441 04/02/2023 LREP Annual SMR ( SUMRPT ) report for 2022 (2553933) was due on 01-APR-23 Violation B Report
1115500 04/02/2023 LREP Annual SMR ( SUMRPT ) report for 2022 (2711194) was due on 01-APR-23 Violation B Report
1115059 12/31/2022 DMON M-003 Annual Perchlorate - IEUA missed analysis Collect additional sample in addition to the annual sample in 2023. Violation U eSMR
1115061 12/31/2022 DMON M-INF 3C (RP-2 Recycled Flow) Annual TCDD (full list) - IEUA missed analysis Collect additional sample in addition to the annual sample in 2023. Violation U eSMR
1109293 10/01/2022 LREP Annual SMR ( PRETRPT ) report for 2021 (2416108) was due on 30-SEP-22 Violation B Report
1103432 08/31/2021 DMON Toxicity data was not reported for 003-A for August 2021. Discharger used NODI P (for lab error) in DMRs triggering a violation. No data reported in eSMR or uploaded in attachments to verify/validate. Violation B Report
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 19 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) CTOX = Chronic Toxicity
DMON = Deficient Monitoring LREP = Late Report
Surface Water = Surface Water

Expand/Contract Enforcement Actions
Enforcement Actions
Enf Id Enf Type Enf Order No. Effective Date Status
338012 Staff Enforcement Letter 11/07/2007 Historical
337534 Admin Civil Liability R8-2006-0068 11/30/2006 Historical
Total Enf Actions: 2

Expand/Contract Inspections
Inspections
Inspection ID Inspection Type Lead Inspector Actual End Date Planned Violations Attachment
48651592 B Type compliance inspection Najah Amin 03/17/2022 N 0 Download
31337829 A Type compliance inspection Julio Lara 12/19/2017 N 0 N/A
24704346 A Type compliance inspection Julio Lara 05/19/2016 N 0 N/A
19662999 A Type compliance inspection Julio Lara 02/23/2015 N 0 [Attachments]
17925103 Pretreatment compliance Julio Lara 04/03/2014 N 0 [Attachments]
15884201 B Type compliance inspection Julio Lara 04/03/2014 N 0 [Attachments]
11216903 A Type compliance inspection Julio Lara 12/14/2012 N 0 [Attachments]
6622627 A Type compliance inspection Julio Lara 12/20/2011 N 0 [Attachments]
4094960 A Type compliance inspection Julio Lara 03/29/2011 N 0 [Attachments]
4155633 Pretreatment compliance Julio Lara 01/04/2011 N 0 Download
2490081 A Type compliance inspection Julio Lara 05/12/2010 N 0 Download
1712631 B Type compliance inspection Julio Lara 05/15/2009 N 0 Download
1419676 A Type compliance inspection Julio Lara 04/25/2008 N 0 Download
1138788 A Type compliance inspection Julio Lara 06/22/2007 Y 0 Download
715385 A Type compliance inspection Julio Lara 06/15/2006 Y 0 Download
338999 A Type compliance inspection Julio Lara 06/16/2005 Y 0 N/A
338387 B Type compliance inspection Julio Lara 11/24/2004 Y 0 N/A
335226 A Type compliance inspection Julio Lara 04/30/2004 Y 0 N/A
334015 B Type compliance inspection Julio Lara 01/30/2004 Y 0 N/A
Total Inspections: 19 Last Inspection: 03/17/2022
  
The current report was generated with data as of: 10/23/2025
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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