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. |
1138933 |
10/20/2024 |
OEV |
Total Coliform Single Sample Maximum limit is 240 MPN/100 mL and reported value was 241 MPN/100 mL at EFF-001A. |
Violation |
N |
eSMR |
Los Coyotes WRP |
445113 |
R4-2021-0142 |
N |
1141158 |
01/05/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 CFU/100 mL and reported value was 2.4 CFU/100 mL at EFF001 WRR. |
Violation |
N |
eSMR |
Pomona Water Reclamation Plant |
134831 |
81-034 |
N |
1144764 |
04/20/2025 |
Deficient Monitoring |
Per Section 4.1 of the MRP, effluent samples shall be analyzed weekly for BOD. BOD results from an effluent sample collected on April 20 were invalidated because the sample analysis was not performed consistent with the method's standard operating procedure (SOP). The SOP was reviewed with laboratory staff to prevent reoccurrence of this issue. |
Violation |
N |
eSMR |
Whittier Narrows Water Reclamation Plant |
443746 |
R4-2021-0096 |
N |
1143283 |
03/31/2025 |
Deficient Monitoring |
Radioactivity. Per the MRP, final effluent shall be analyzed quarterly for radioactivity. At the Pomona WRP, the second quarter grab samples for gross alpha, gross beta, uranium, radium-226, radium-228, tritium, and strontium-90 were not collected due to a Laboratory oversight. Following the Laboratory Information Management System (LIMS) update in November 2024, the Sanitation Districts identified a system issue in which the automated regeneration of sampling events for certain compounds began defaulting to an incorrect interval rather than the intended frequency. The Sanitation Districts¿ LIMS administrator is aware of the issue and is actively working with the system¿s provider to resolve it. As a corrective measure, a separate schedule has been established to ensure these compounds continue to be sampled on a quarterly basis. Make-up samples were collected on April 8, and the results will be reported in the April 2025 monthly compliance report. The Pomona WRP was operating under normal conditions during the month. Thus, the concentrations of the radioactivity compounds in the final effluent are expected to have been within normal ranges. |
Violation |
N |
eSMR |
Pomona Water Reclamation Plant |
134831 |
81-034 |
N |
1144787 |
04/30/2025 |
CTOX |
Chronic Toxicity-C.dubia-Reproduction Monthly Median limit is 1 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at EFF-002. |
Violation |
N |
eSMR |
San Jose Creek Water Reclamation Plant |
443109 |
R4-2021-0131 |
N |
1141095 |
12/10/2024 |
Deficient Monitoring |
Per Section 4.1 of the MRP, ammonia shall be analyzed weekly in the influent and effluent. No influent and effluent ammonia results are available for the week of December 8, 2024. Influent and effluent samples for ammonia analysis were collected on December 10, however, the samples were inadvertently lost after collection and could not be analyzed. Laboratory staff have reviewed sample handling and custody procedures to prevent reoccurrence of this issue. Make-up samples were collected on January 16, 2025, and the results will be included in the January 2025 monthly NPDES report. |
Violation |
N |
eSMR |
A.K. Warren Water Resource Facility |
452398 |
R4-2023-0181 |
N |
1148310 |
07/20/2025 |
Deficient Monitoring |
Per Section 4.1 of the MRP, effluent samples shall be analyzed daily for settleable solids. An effluent sample was collected and analyzed for settleable solids on July 20, however, the result was inadvertently not recorded in the laboratory information management system (LIMS). As a result, there is no reportable settleable solids concentration for July 20. To prevent this issue from reoccurring, laboratory staff have been reminded to immediately enter concentration results into LIMS after tests are completed. |
Violation |
N |
eSMR |
Los Coyotes WRP |
445113 |
R4-2021-0142 |
N |
1143312 |
02/20/2025 |
Surface Water |
Per Section 5.1.16 of the WDR, the discharge shall not result in visible floating particulates, foams, or oil and grease in the receiving waters. On February 20 at 9:45 a.m., Sanitation Districts sampling personnel observed foam in the San Gabriel River downstream of Discharge Point 001B and traveling to receiving water station RSW-007 (R-13). Operations staff confirmed that the SJCE and SJCW WRPs were operating normally during this time and no changes to the treatment process or foaming had occurred at the plants. However, as a precautionary measure, the defoamant dose was increased at both WRPs the same day. The sampling crew returned to receiving water station RSW-007 (R-13) the following day on February 21 at 10:52 a.m. and observed less foam; by 2:14 p.m., the foam was no longer present. The Sanitation Districts will continue to monitor water quality in the effluent and receiving waters, and the San Jose Creek WRP Operations staff will continue their normal procedures to increase the defoamant dose if foam is observed. |
Violation |
N |
eSMR |
San Jose Creek Water Reclamation Plant |
443109 |
R4-2021-0131 |
N |
1147205 |
07/01/2025 |
CAT1 |
Chloride Daily Maximum limit is 150 mg/L and reported value was 161 mg/L at EFF001 WRR. |
Violation |
N |
eSMR |
Pomona Water Reclamation Plant |
134831 |
81-034 |
N |
1142110 |
01/05/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 CFU/100 mL and reported value was 2.4 CFU/100 mL at EFF-001. |
Violation |
N |
eSMR |
Pomona Water Reclamation Plant |
432902 |
R4-2021-0097 |
N |
1143992 |
03/31/2025 |
Deficient Monitoring |
Per Section 4.1 of the MRP, effluent samples shall be analyzed monthly for dissolved oxygen. An effluent sample for dissolved oxygen was inadvertently not collected in March due to a laboratory oversight. The Los Coyotes WRP was operating normally in March and effluent dissolved oxygen levels are expected to have been within normal ranges. To prevent this issue from re-occurring, staff have been instructed to more proactively monitor sample collection schedules to ensure that all required samples are collected. |
Violation |
N |
eSMR |
Los Coyotes WRP |
445113 |
R4-2021-0142 |
N |
1139999 |
11/28/2024 |
Deficient Monitoring |
Per Section 4.1 of the MRP, effluent samples shall be analyzed monthly for aldrin and dieldrin. The effluent sample collected on November 28 was invalidated because it was not delivered to the laboratory within 72 hours for pH adjustment, as required by the analytical method for these compounds. Therefore, there are no reportable aldrin and dieldrin effluent results for the month of November. A make-up sample was collected on December 16 and will be included in the December monthly report. To prevent this issue from reoccurring, a 3-day sample hold time will be implemented to ensure that laboratory pH measurements and adjustments are completed within the 72-hour method requirement. |
Violation |
N |
eSMR |
A.K. Warren Water Resource Facility |
452398 |
R4-2023-0181 |
N |
1141157 |
01/04/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 CFU/100 mL and reported value was 2.4 CFU/100 mL at EFF001 WRR. |
Violation |
N |
eSMR |
Pomona Water Reclamation Plant |
134831 |
81-034 |
N |
1142109 |
01/04/2025 |
OEV |
Total Coliform 7-Day Median limit is 2.2 CFU/100 mL and reported value was 2.4 CFU/100 mL at EFF-001. |
Violation |
N |
eSMR |
Pomona Water Reclamation Plant |
432902 |
R4-2021-0097 |
N |
1139996 |
11/30/2024 |
CAT2 |
Chlorine, Total Residual Maximum Daily (MDEL) limit is 0.10 mg/L and reported value was 0.19 mg/L at EFF-002. |
Violation |
N |
eSMR |
San Jose Creek Water Reclamation Plant |
443109 |
R4-2021-0131 |
N |
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