| 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. |
| 1159382 |
06/30/2026 |
CTOX |
Chronic Toxicity Monthly Median limit is 0 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 |
| 1159378 |
04/16/2026 |
Deficient Monitoring |
Per Section IV.A.1 of the MRP, various constituents are required to be analyzed in the discharge on a monthly, quarterly, or annual basis. Groundwater dewatering was conducted intermittently on April 16 and 17 to support pile installation activities. Laboratory staff were not notified that the dewatering discharge was occurring, and a sample was not collected during discharge. Dewatering activities ceased on April 17, and no additional discharge occurred for the remainder of the quarterly monitoring period. Consequently, sample collection and analysis of the required monthly and quarterly constituents could not be completed for this monitoring period. To prevent recurrence, project staff will notify laboratory and compliance staff before future dewatering begins and confirm that the required sampling arrangements are in place before discharge occurs. |
Violation |
N |
eSMR |
White Point Outfall Manifold Construction Dewatering Project |
416661 |
R4-2019-0053 |
N |
| 1158333 |
05/31/2026 |
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 EFF-002. |
Violation |
N |
eSMR |
San Jose Creek Water Reclamation Plant |
443109 |
R4-2021-0131 |
N |
| 1155408 |
03/31/2026 |
Surface Water |
Per Section 5.1.21 of the WDR, there shall be no chronic toxicity in ambient waters as a result of wastes discharged. Per Section 8.1 of the MRP, compliance with this objective is determined using the monthly median chronic toxicity summary result. In March 2026, the monthly median chronic toxicity summary result at receiving water monitoring station RSW-007 (R-13) exceeded the narrative receiving water objective. The monthly median result was based on two valid Ceriodaphnia dubia chronic toxicity tests conducted by the Sanitation Districts' San Jose Creek Water Quality Laboratory. A toxicity test initiated on March 17 using receiving water grab samples collected on March 16, 18, and 20, failed the Test of Significant Toxicity (TST) with a 46.9% reproduction effect and a 15.0% survival effect in the undiluted receiving water sample. A test initiated on March 26 using grab samples collected on March 25, 27, and 30, also failed the TST with a 34.4% reproduction effect and a 0% survival effect in the undiluted receiving water sample. Because two valid tests conducted during March 2026 failed the TST, the monthly median toxicity summary result at RSW-007 (R-13) also failed the TST and therefore exceeded the narrative receiving water chronic toxicity objective. In accordance with Sections 6.1.2.y and 5.5.1 of the NPDES permit, the Regional Board was notified by telephone on April 2 at 8:26 a.m., and written notification was provided on April 6. No obvious causes for the observed toxicity were identified. Final effluent from the SJCE and SJCW WRPs met the chronic toxicity maximum daily and monthly median effluent limits in March 2026. The Sanitation Districts will continue to monitor receiving water toxicity and will conduct further investigation if persistent toxicity is observed. |
Violation |
N |
eSMR |
San Jose Creek Water Reclamation Plant |
443109 |
R4-2021-0131 |
N |
| 1154399 |
02/28/2026 |
Surface Water |
Per Section 5.1.20 of the NPDES permit, waste discharge shall not cause the ammonia water quality objectives in the Los Angeles Region Basin Plan (Basin Plan) to be exceeded in receiving waters. On February 23, the measured ammonia concentration at receiving water station RSW-002, which is located downstream of the Long Beach WRP discharge point, was 8.31 mg/L (as nitrogen), which exceeded the calculated chronic (30-day average) Basin Plan objective of 5.3 mg/L based on concurrent pH and temperature measurements. The ammonia concentration met the calculated acute (1-hour average) objective of 23 mg/L. Final effluent ammonia monitoring at the Long Beach WRP was conducted on February 3 and 10, with results of 4.66 and 3.16 mg/L (as nitrogen), respectively. Final effluent ammonia was not measured on February 23, 2026. The Long Beach WRP was operating under normal conditions at the time of the exceedance, and no significant operational issues or process upsets were identified that would indicate reduced ammonia removal or treatment performance at the plant. Accordingly, no direct cause could be determined for the elevated ammonia concentration at the downstream receiving water station. |
Violation |
N |
eSMR |
Long Beach WRP |
447474 |
R4-2022-0032 |
N |
| 1154398 |
02/28/2026 |
Surface Water |
Per Section 5.1.21 of the NPDES Permit, waste discharge shall not cause the ammonia water quality objective in the Los Angeles Region Basin Plan (Basin Plan) to be exceeded in the receiving waters. Per Section 8.2 of the MRP, compliance with the ammonia water quality objective for the Los Coyotes WRP is assessed at receiving water station RSW-002 (R-4), which is located downstream of the Los Coyotes WRP discharge point. The measured ammonia concentration in the receiving water at RSW-002 (R-4) on February 23 was 5.96 mg/L (as nitrogen), which exceeded the calculated chronic (30-day average) Basin Plan objective of 4.3 mg/L using the concurrent pH and temperature monitoring results at RSW-002 on the same date. The ammonia concentration at RSW-002 met the calculated acute (1-hour average) objective of 14 mg/L. Final effluent ammonia monitoring at the Los Coyotes WRP was conducted earlier in the month on February 4 (with a result of 1.7 mg/L ammonia as nitrogen). Therefore, a final effluent ammonia concentration is not available on February 23. The Los Coyotes WRP was operating under normal conditions at the time of the exceedance, and no operational issues or process upsets were identified that would indicate reduced ammonia removal or treatment performance at the plant. Accordingly, no direct cause could be determined for the elevated ammonia concentration at the downstream receiving water station. |
Violation |
N |
eSMR |
Los Coyotes WRP |
445113 |
R4-2021-0142 |
N |
| 1151245 |
12/02/2025 |
CAT1 |
Chloride Daily Maximum limit is 150 mg/L and reported value was 165 mg/L at EFF001 WRR. |
Violation |
N |
eSMR |
Pomona Water Reclamation Plant |
134831 |
81-034 |
N |
| 1150417 |
10/21/2025 |
Deficient Monitoring |
Per Section 4.1 of the MRP, turbidity must be analyzed weekly in the effluent using both 24-hour composite and grab samples. No reportable 24-hour composite turbidity result is available for the week of October 19 because the composite effluent sample collected for turbidity analysis on October 21 was not analyzed within the method holding time. A makeup composite sample was collected on November 5 and will be reported in the November 2025 NPDES monthly monitoring report. The turbidity result from the effluent grab sample collected the week of October 19 was within normal ranges. To prevent reoccurrence of this issue, the laboratory has implemented an automated alert in the Laboratory Information Management System (LIMS) to notify staff when turbidity samples have been collected and are ready for analysis. |
Violation |
N |
eSMR |
A.K. Warren Water Resource Facility |
452398 |
R4-2023-0181 |
N |
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