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California Integrated Water Quality System Project (CIWQS)
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Place ID 239291 		  
  
  
  
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General Information
Region Place ID Place Name Place Type Place Address Place County
6B 239291 Mammoth Mtn Ski Area WTF Wastewater Treatment Facility 1315 Meridian Mammoth Lakes, CA, 93546 Mono
Expand/Contract Related Parties
Related Parties
Party Party Type Party Name Role Classification Relationship Start Date Relationship End Date
520828 Person Greg Foote Pending-is a data submitter for 01/19/2010
27662 Organization Mammoth Mountain Ski Area LLC Owner Privately-Owned Business 01/12/1984
Total Related Parties: 2
Expand/Contract Regulatory Measures
Regulatory Measures
Reg Measure ID Reg Measure Type Region Program Order No. WDID Effective Date Expiration Date Status Amended?
147525 WDR 6V WDRMUNIOTH 00-017 6B261026001 03/09/2000 03/09/2015 Active N
147192 WDR 6V WDR 84-011 6B261026001 01/12/1984 01/12/1999 Historical N
Total Reg Measures: 2
Expand/Contract Violations
Violations
Violation ID Occurred Date Violation Type (-) Violation Description Corrective Action Status Classification Source
1144650 10/24/2024 OEV pH Instantaneous Maximum limit is 9.0 SU and reported value was 9.17 SU. Discharger provided that increased aeration would be applied to pond C to remedy the issue. Violation B Report
1141306 11/16/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.22 SU. Violation B Report
1141304 11/08/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.34 SU. Violation B Report
1141303 11/01/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.47 SU. Violation B Report
1141302 10/25/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.25 SU. Violation B Report
1141343 10/12/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.11 SU. Violation B Report
1141342 10/04/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.12 SU. Violation B Report
1141353 09/20/2023 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.81 mg/L. Violation B Report
1141351 09/15/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.12 SU. Violation B Report
1141344 09/06/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.2 SU. Violation B Report
1141350 08/30/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 10.1 SU. Violation B Report
1141349 08/23/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.6 SU. Violation B Report
1141348 08/15/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.35 SU. Violation B Report
1141347 08/03/2023 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.66 SU. Violation B Report
1141352 07/27/2023 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.93 mg/L. Violation B Report
1113600 11/22/2022 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.97 mg/L. Water Board staff issued a staff enforcement letter on 2/23/23. Discharger must continue monitoring and report further of the pond and notify Water Board staff of further increased detections. Violation B Report
1113599 11/10/2022 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.91 mg/L. Water Board staff issued a staff enforcement letter on 2/23/23. Violation B Report
1113597 11/10/2022 OEV pH Instantaneous Maximum limit is 9.0 SU and reported value was 9.19 SU. Water Board staff issued a staff enforcement letter on 2/23/23. Violation B Report
1113598 11/01/2022 OEV pH Instantaneous Maximum limit is 9.0 SU and reported value was 9.18 SU. Water Board staff issued a staff enforcement letter on 2/23/23. Violation B Report
1113594 09/29/2022 OEV pH Instantaneous Maximum limit is 9.0 SU and reported value was 9.08 SU. Violation B Report
1113595 09/09/2022 OEV pH Instantaneous Maximum limit is 9.0 SU and reported value was 9.24 SU. Violation B Report
1113596 09/09/2022 OEV pH Instantaneous Maximum limit is 9.0 SU and reported value was 9.56 SU. Violation B Report
1107095 08/03/2022 LREP Section II.B states, ¿By January 30, 2001 and each year thereafter, the Discharger shall submit an annual report summarizing the previous year¿s monitoring data using graphs and tables.¿ This Annual Report was due 1/30/2022 but was not submitted until 8/3/2022, making this report 185 days late. The discharger submitted the report to GeoTracker on 8/3/2022. Staff reviewed the submittal dates of subsequent reports up to 4th Quarter 2022 and found no late reports. Violation B Report
1106074 05/01/2022 LREP According to the WDR, Pg. 14 Section II.B. states submittal period requirements. These requirements state, ¿Quarterly Monitoring Reports containing the above-required information shall be submitted to the Regional Board by the 15th day following the end of each quarter.¿ This report was due on 4/15/2022 but not submitted until 5/1/2022. monitoring report was submitted 16 days late from the due date to the submission date. Continue monitoring for late reporting. Violation B Report
1106967 02/15/2022 Deficient Reporting According to the WDRs, Pg. 12 Section I.B. states effluent reporting requirements. These requirements state, ¿Grab samples of the effluent discharged to the first pond from which percolation can occur, shall be collected and analyzed to determine the magnitude of the following parameters.¿ pH and Dissolved Oxygen must be recorded weekly according to the Board Order. The lab reports for Ponds A ¿ D, during the month of November, do not include the required pH and Dissolved Oxygen as required by the Board Order. Violation B Report
1106966 02/15/2022 LREP According to the WDRs, Pg. 14 Section II.B. states submittal period requirements. These requirements state, ¿Quarterly Monitoring Reports containing the above-required information shall be submitted to the Regional Board by the 15th day following the end of each quarter.¿ This report was due on 1/15/2022 but not submitted until 2/15/2022. For the late report violation, monitoring report was submitted 31 days late from the due date to the submission date. Violation B Report
1106071 10/19/2021 LREP According to the WDR, Pg. 14 Section II.B. states submittal period requirements. These requirements state, ¿Quarterly Monitoring Reports containing the above-required information shall be submitted to the Regional Board by the 15th day following the end of each quarter.¿ This report was due on 7/15/2021 but not submitted until 10/19/2021. Monitoring report was submitted 96 days late from the due date to the submission date. Violation B Report
1106073 10/19/2021 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.78 mg/L. Violation B Report
1106072 10/19/2021 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.75 SU. Violation B Report
1107125 09/30/2021 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.18 SU. Violation B Report
1107128 09/08/2021 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.96 mg/L. Violation B Report
1107129 08/19/2021 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.87 mg/L. Violation B Report
1107127 08/12/2021 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.78 mg/L. Violation B Report
1107096 06/30/2021 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.1 SU. Violation B Report
1107126 06/24/2021 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.61 SU. Violation B Report
1107097 06/24/2021 OEV pH Single Sample Maximum limit is 9.0 SU and reported value was 9.75 SU. Violation B Report
1107130 05/20/2021 OEV Dissolved Oxygen Instantaneous Minimum limit is 1.0 mg/L and reported value was 0.97 mg/L. Violation B Report
1106070 05/19/2021 LREP This report was due on 1/30/2021 but not submitted until 5/19/2021, making it 109 days late from the due date to the submission date Violation B Report
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
Deficient Reporting = Deficient Reporting LREP = Late Report
OEV = Other Effluent Violation
Expand/Contract Enforcement Actions
Enforcement Actions
Enf Id Enf Type Enf Order No. Effective Date Status
452364 Waste Discharge Requirements 02/23/2023 Historical
440208 Oral Communication 05/07/2020 Historical
416627 Notice of Violation 08/04/2017 Historical
382831 Oral Communication 01/11/2012 Historical
377323 Oral Communication 08/12/2010 Historical
244557 Oral Communication 12/10/2000 Historical
244478 Oral Communication 12/05/2000 Historical
Total Enf Actions: 7
Expand/Contract Inspections
Inspections
Inspection ID Inspection Type Lead Inspector Actual End Date Planned Violations Attachment
52078540 B Type compliance inspection Sergio Alonso 06/13/2023 N 0 Download
45390589 B Type compliance inspection Sergio Alonso 09/08/2021 N 0 N/A
37683060 B Type compliance inspection Jehiel Cass 09/20/2019 N 0 Download
34175058 B Type compliance inspection Sergio Alonso 10/24/2018 N 0 Download
32575906 B Type compliance inspection John Morales 05/09/2018 N 0 N/A
29873722 B Type compliance inspection John Morales 08/03/2017 Y 1 [Attachments]
22084936 B Type compliance inspection Thomas Browne 10/14/2015 Y 0 [Attachments]
18257488 B Type compliance inspection Francis Michael Coony 11/05/2014 N 0 Download
6742563 B Type compliance inspection Ghasem Pour-ghasemi 09/14/2011 N 0 Download
1130014 A Type compliance inspection Judy Keir 05/24/2007 N 0 Download
332564 B Type compliance inspection Kai Dunn 09/24/2003 Y 0 N/A
325043 B Type compliance inspection Kai Dunn 08/09/2001 Y 0 N/A
296012 B Type compliance inspection Michele Ochs 12/02/1999 Y 0 N/A
295995 B Type compliance inspection Rosalyn Fleming 06/30/1999 Y 0 N/A
295994 B Type compliance inspection Brad Nelson 08/17/1995 Y 0 N/A
295996 B Type compliance inspection Unknown u 06/23/1994 Y 0 N/A
Total Inspections: 16 Last Inspection: 06/13/2023
  
The current report was generated with data as of: 05/15/2026
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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