| 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. |
| 1151345 |
02/18/2026 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Root Intrusion caused 225 gallons of sewage to spill from Lateral Clean Out (Private) at 205 41st to Street/Curb and Gutter (2 3),Paved Surface,Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1151311 |
02/09/2026 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Debris-General,Debris from Lateral,Debris-Rags,Debris-wipes/Non-disposables,Fats, Oil and Grease (FOG) caused 6500 gallons of sewage to spill from Manhole at 30 Melrose Ct to Other (specify below) |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1151310 |
02/10/2026 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Fats, Oil and Grease (FOG),Debris-Rags caused 1025 gallons of sewage to spill from Manhole,Gravity Mainline at 29th ave alameda de las pulgas to Drainage Conveyance System that discharges to surface water,Street/Curb and Gutter (2 3) |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1151305 |
02/14/2026 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below) caused 1500 gallons of sewage to spill from Manhole at 456 Cornell to Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1151033 |
02/06/2026 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Fats, Oil and Grease (FOG) caused 960 gallons of sewage to spill from Manhole at 459 Cornell Ave to Drainage Conveyance System that discharges to surface water,Street/Curb and Gutter (2 3),Paved Surface |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 1150276 |
01/04/2026 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Rainfall Exceeded Design, I and I (Separate Collection System Only) caused 975 gallons of sewage to spill from Manhole at 1229 Quince to Street/Curb and Gutter (2 3),Paved Surface,Drainage Conveyance System that discharges to surface water |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
| 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 |
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