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. |
1139833 |
01/30/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below),Damage by Others Not Related to Co |
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 |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
1138285 |
12/14/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below) caused 19500 gallons of sewage to |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
1138282 |
12/14/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below) caused 5400 gallons of sewage to s |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
1133797 |
06/24/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Root Intrusion caused 1200 gallons of sewage to spill fr |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
1133796 |
01/23/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Fats, Oil and Grease (FOG) caused 5300 gallons of sewage |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
1133795 |
01/22/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Debris-wipes/Non-disposables, Root Intrusion caused 1850 |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
1133794 |
12/20/2023 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Other (specify below) caused 75600 gallons of sewage to |
Violation |
None |
SSO |
San Mateo CIty CS |
300189 |
2022-0103-DWQ |
N |
1125037 |
02/02/2024 |
CAT2 |
Chlorine, Total Residual 1-Hour Average (Mean) limit is 0.34 mg/L and reported v |
Violation |
N |
eSMR |
San Mateo WWTP |
454700 |
R2-2023-0017 |
N |
1124191 |
01/23/2024 |
Deficient Monitoring |
The Plant performed a titration but failed to properly record the data during th |
Violation |
N |
eSMR |
San Mateo WWTP |
454700 |
R2-2023-0017 |
N |
1124190 |
01/15/2024 |
Deficient Monitoring |
failure to perform the required hourly titration during the 0600 hour. |
Violation |
N |
eSMR |
San Mateo WWTP |
454700 |
R2-2023-0017 |
N |
1122963 |
11/26/2023 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 0 mg/L and reported valu |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1122962 |
11/01/2023 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 0 mg/L and reported valu |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1121955 |
10/27/2023 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 0 mg/L and reported valu |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1121954 |
10/12/2023 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 0 mg/L and reported valu |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1121048 |
09/13/2023 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 0.0 mg/L and reported va |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1118641 |
06/27/2023 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 0.0 mg/L and reported va |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
Y |
1106977 |
07/02/2022 |
CAT1 |
Carbonaceous Biochemical Oxygen Demand (CBOD) (5-day @ 20 Deg. C) Weekly Average |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
Y |
1106976 |
07/02/2022 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average (Mean) limit is 30 mg/L and reported |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
Y |
1106975 |
07/26/2022 |
CAT2 |
Chlorine, Total Residual Instantaneous Maximum limit is 0.0 mg/L and reported va |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
Y |
1106470 |
06/30/2022 |
CAT1 |
Carbonaceous Biochemical Oxygen Demand (CBOD) (5-day @ 20 Deg. C) Monthly Averag |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
Y |
1098821 |
12/23/2021 |
Order Conditions |
December 23, 2021, an unauthorized discharge occurred due to very high effluent |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1098820 |
12/16/2021 |
Order Conditions |
The week of December 13, 2021, the Monday through Friday average effluent flow w |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1096360 |
10/25/2021 |
Order Conditions |
The City of San Mateo experienced a major storm event On October 24, 2021. On Oc |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1092275 |
06/18/2021 |
Order Conditions |
The unauthorized discharge event took place on Friday, June 18, 2021 at 0600, 08 |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1084545 |
06/12/2020 |
Order Conditions |
On Friday, June 12, 2020 at the City of San Mateo WWTP, approximately 250 gallon |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1084544 |
06/03/2020 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average (Mean) limit is 30 mg/L and reported |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1077307 |
06/12/2020 |
Order Conditions |
On Friday, June 12, 2020 at the City of San Mateo WWTP, approximately 250 gallon |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
N |
1077306 |
06/06/2020 |
CAT1 |
Total Suspended Solids (TSS) Weekly Average (Mean) limit is 30 mg/L and reported |
Violation |
N |
eSMR |
San Mateo WWTP |
421205 |
R2-2018-0016 |
Y |
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