| 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. |
| 1149813 |
08/13/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Fats, Oil and Grease (FOG) caused 165 gallons of sewage to spill from Gravity Mainline at 831 W. Hillsdale Blvd to Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1149812 |
08/27/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Root Intrusion caused 3750 gallons of sewage to spill from Inside Building or Structure at 294 w 39th ave san mateo to Drainage Conveyance System,Drainage Conveyance System that discharges to surface water,Street/Curb and Gutter (2 3),Building or Structure,Paved Surface |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1149811 |
12/02/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below),Flow Exceeded Capacity (Separate Collection System Only) caused 200 gallons of sewage to spill from Manhole at 2051 S Norfolk to Surface Water,Street/Curb and Gutter (2 3) |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1149809 |
11/25/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Debris-Rags,Collection System Maintenance Failure (specify below),Fats, Oil and Grease (FOG) caused 27000 gallons of sewage to spill from Manhole at 3418 Shasta Dr. San Mateo Ca. to Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1142177 |
02/15/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below) caused 613500 gallons of sewage to spill from Manhole at 3905 Kingridge Drive to Surface Water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1141079 |
02/15/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below) caused 684000 gallons of sewage to spill from Manhole at 3905 Kingridge Drive to Surface Water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1140508 |
02/13/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Flow Exceeded Capacity (Separate Collection System Only) caused 270000 gallons of sewage to spill from Manhole at Saratoga UFES to Surface Water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1139833 |
01/30/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below),Damage by Others Not Related to Collection System Construction/Maintenance caused 707 gallons of sewage to spill from Other (specify below) at Mariners Island 3 Force Main to Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1138589 |
12/31/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Fats, Oil and Grease (FOG) caused 3200 gallons of sewage to spill from Manhole,Gravity Mainline at S Norfolk st. and Lago st. to Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
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