| 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. |
| 1141596 |
03/23/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Debris-Rags,Debris-wipes/Non-disposables caused 3600 gallons of sewage to spill from Manhole at Treat Blvd/San Miguel/Ygnacio Woods to Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
Concord City CS |
299830 |
2022-0103-DWQ |
N |
| 1140607 |
01/29/2025 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.065 mg/L and reported value was 0.168 mg/L at EFF-001. |
Violation |
N |
eSMR |
Napa Sanitation District WWTP (Soscol Water Recycling Facility) |
446586 |
R2-2022-0003 |
N |
| 1138316 |
11/10/2024 |
Deficient Monitoring |
The NPDES permit requires WQCP to monitor pH at the E-001 site. Since June 1, 2023, WQCP has implemented real-time pH monitoring at E-001 using a HACH Digital pH sensor (model #: DPD1P1), with data transmitted to SCADA via the HACH controller (model#: SC200). In November 2024, technical issues with the controller caused data transmission failures on 7 days, resulting in 3 days with data gaps more than 60 minutes and the total time of data gaps during the calendar month more than 7 hours and 26 minutes. These conditions are specified for compliance determinations using a continuous monitor (Order No. R2-2019-0021, Table 4, footnote 1). Despite the missing data, the effluent pH remained within the compliance range of 6-9 s.u., as confirmed by the upstream pH analyzer, located after the aeration basins and before the secondary clarifiers. The upstream analyzer typically records pH values similar to those measured at E-001 and demonstrated consistent compliance within the 6.0¿9.0 range throughout the month. A thorough investigation was conducted by the Lead Plant Mechanic Kenneth de Leon and Lead Operator Ryan Estrada. Hardware, communication, environmental, and SCADA-related causes were ruled out (see table below). However, software glitches or bugs remain a possible, undetermined factor. It was observed that when the analyzer sent a warning signal to the controller, data transmission between the controller and SCADA is paused. |
Violation |
N |
eSMR |
South San Francisco-San Bruno WQCP |
432955 |
R2-2019-0021 |
N |
| 1134077 |
05/13/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Flow Exceeded Capacity (Separate Collection System Only), Root Intrusion caused 115 gallons of sewage to spill from Lateral Clean Out (Private), Manhole at West Campus Trunk Line to Drainage Conveyance System that discharges to surface water, Paved Surface, Unpaved Surface |
Violation |
None |
SSO |
SLAC National Accelerator Laboratory CS |
353137 |
2022-0103-DWQ |
N |
|
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