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. |
1142754 |
01/28/2025 |
CTOX |
Chronic Toxicity-Green Alga-Growth Monthly Median limit is 0 % effect and reported value was 88 % effect at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1142753 |
01/13/2025 |
CTOX |
Chronic Toxicity-Green Alga-Growth Maximum Daily (MDEL) and reported value was 63 % effect at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1142750 |
03/31/2025 |
CAT2 |
Dichlorobromomethane Monthly Average limit is .56 ug/L and reported value was .9 ug/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1141746 |
02/04/2025 |
Surface Water |
The difference in true color units between RSW-004 and RSW-005 was 37 on 2/4/25 |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1141745 |
02/04/2025 |
Surface Water |
Receiving water temperature between RSW-004 and RSW-005 differed by 9.5 degrees Fahrenheit on 2/4/25. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1140755 |
02/16/2025 |
Late Report |
Annual SMR ( SUMRPT ) (Summary Report) report for 2024 (2788363) was due on 15-FEB-25 |
Violation |
None |
Report |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1140647 |
01/31/2025 |
CAT1 |
Nitrate, Total (as N) Monthly Average limit is 10.0 mg/L and reported value was 17.0 mg/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1140646 |
01/07/2025 |
Surface Water |
The diffference in true color units between RSW-005 and RSW-004 was 28. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1140080 |
02/04/2025 |
Late Report |
Annual SMR ( PRETRPT ) (Pretreatment Annual) report for 2024 (2788362) was due on 03-FEB-25 |
Violation |
None |
Report |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1140079 |
02/04/2025 |
Late Report |
Annual SMR ( SLUDGE ) (Biosolids (Sludge) Tech Rpt) report for 2024 (2788364) was due on 03-FEB-25 |
Violation |
None |
Report |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1140078 |
02/04/2025 |
Late Report |
Annual SMR ( PRETRPT ) (Pretreatment Annual) report for 2024 (2910116) was due on 03-FEB-25 |
Violation |
None |
Report |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1140077 |
02/04/2025 |
Late Report |
Annual SMR ( SLUDGE ) (Biosolids (Sludge) Tech Rpt) report for 2024 (2910122) was due on 03-FEB-25 |
Violation |
None |
Report |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1140054 |
02/02/2025 |
Late Report |
Annual SMR ( MONNPDES ) (NPDES Mon Rpt Annual) report for 2024 (2788365) was due on 01-FEB-25 |
Violation |
None |
Report |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1140038 |
12/03/2024 |
Surface Water |
Sodium Annual Mean was 76 mg/L at RSW-005 |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1139349 |
01/24/2025 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Collection System Maintenance Failure (specify below) caused 35 gallons of sewage to spill from Gravity Mainline at 1023 Chorro to Surface Water |
Violation |
None |
SSO |
San Luis Obispo CS |
299937 |
2022-0103-DWQ |
N |
1139140 |
12/31/2024 |
CAT2 |
Molybdenum, Total Monthly Average limit is 0.01 mg/L and reported value was 0.03 mg/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1139139 |
12/11/2024 |
Surface Water |
Receiving Water RSW-005 Color - RSW-005 was 30 true color units greater than RSW-004. The SLO WRRF upgrade, known as SLO Water+, is nearing completion; however, the facility can only operate on its full biological treatment process until the completion of the Liquids Phase Two. With two of four bioreactors online, hydraulic retention time is limited. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1139138 |
07/02/2024 |
Surface Water |
The annual running mean for RSW-005 sodium was 70 mg/L. THIS VIOLATION HAS BEEN REPORTED UNDER THE PREVIOUS NPDES PERMIT FOR QUARTER 3 2024. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1137873 |
11/30/2024 |
CAT2 |
Dibromochloromethane Monthly Average (Mean) limit is 0.4 ug/L and reported value was 0.9 ug/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1137872 |
11/05/2024 |
CAT2 |
Dibromochloromethane Maximum Daily (MDEL) limit is 0.81 ug/L and reported value was 0.9 ug/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1137871 |
11/05/2024 |
Surface Water |
temperature |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1137870 |
11/05/2024 |
Surface Water |
color |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1136646 |
10/15/2024 |
Surface Water |
Receiving Water RSW-005 Color - RSW-005 was 33 true color units greater than RSW-004. The SLO WRRF upgrade, known as SLO Water+, is nearing completion; however, the facility can only operate on its full its biological treatment process until the completion of the Liquids Phase Two. With two of four bioreactors online, hydraulic retention time is limited. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1136645 |
10/31/2024 |
CAT2 |
Molybdenum, Total Monthly Average limit is 0.01 mg/L and reported value was 0.031 mg/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1136644 |
10/23/2024 |
Deficient Monitoring |
Sodium hypochlorite was used to disinfect and clean a UV vessel on 10/23/24. The total estimated volume of sodium hypochlorite used was 5 gallons. Only one EFF-001 total chlorine residual sample was taken. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1136023 |
11/02/2024 |
Late Report |
Quarterly SMR ( PRETRPT ) (Pretreatment Mon Rpt Quarterly) report for Q3 2024 (2829692) was due on 01-NOV-24 |
Violation |
None |
Report |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1136008 |
11/02/2024 |
Late Report |
Quarterly SMR ( PRETRPT ) (Pretreatment Mon Rpt Quarterly) report for Q3 2024 (2910117) was due on 01-NOV-24 |
Violation |
None |
Report |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1136007 |
11/02/2024 |
Late Report |
Quarterly SMR ( MONNPDES ) (NPDES Mon Rpt Quarterly) report for Q3 2024 (2910119) was due on 01-NOV-24 |
Violation |
None |
Report |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135201 |
09/11/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135200 |
09/04/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135199 |
09/03/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135198 |
09/12/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135197 |
09/09/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135196 |
09/06/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135195 |
09/05/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135194 |
09/10/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135093 |
09/12/2024 |
Order Conditions |
Effluent-002 Total Coliform Daily Max 25.6 MPN/100 mL on 9/12/24. The elevated results were all analyzed using Standard Methods 9223. Standard Methods 9223 is prone to a positive test interference from non-coliform heterotrophic background bacteria. All results have been <1.8 MPN/ 100mL since switching to the analytical method SM 9221 (Multiple Tube Fermentation). |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135092 |
09/03/2024 |
Surface Water |
RSW-005 was 26 true color units greater than RSW-004. The SLO WRRF upgrade, known as SLO Water+, is nearing completion; however, the facility can only operate on its full its biological treatment process until the completion of the Liquids Phase Two. With two of four bioreactors online, hydraulic retention time is limited. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135091 |
09/19/2024 |
Order Conditions |
Effluent-002 7 Sample Median 3.1 MPN/100 mL on 9/19/24. The elevated results were all analyzed using Standard Methods 9223. Standard Methods 9223 is prone to a positive test interference from non-coliform heterotrophic background bacteria. All results have been <1.8 MPN/ 100mL since switching to the analytical method SM 9221 (Multiple Tube Fermentation). |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135090 |
09/13/2024 |
Order Conditions |
Effluent-002 Total Coliform Daily Max 65.0 MPN/100 mL on 9/13/24. The elevated results were all analyzed using Standard Methods 9223. Standard Methods 9223 is prone to a positive test interference from non-coliform heterotrophic background bacteria. All results have been <1.8 MPN/ 100mL since switching to the analytical method SM 9221 (Multiple Tube Fermentation). |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1135089 |
09/02/2024 |
Deficient Monitoring |
The Water Quality Laboratory used method Standard Methods 9223 for Total Coliform Monitoring through 9/12/24. Standard Methods 9223 is not approved to measure Total Coliforms in wastewater but is approved to measure coliforms in Title 22 Recycled water. All analyses conducted through 9/12/24 are reported at the monitoring location EFF-002. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
456704 |
R3-2024-0001 |
N |
1134600 |
07/02/2024 |
Surface Water |
The annual running mean for RSW-005 sodium was 70 mg/L |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1133723 |
07/23/2024 |
Sanitary Sewer Overflow/Spill/ |
Type: Category 1 Spill; Debris from Lateral, Root Intrusion caused 911 gallons of sewage to spill from Lateral Clean Out (Private) at 2015 Monterey St to Paved Surface, Surface Water, Unpaved Surface |
Violation |
None |
SSO |
San Luis Obispo CS |
299937 |
2022-0103-DWQ |
N |
1132902 |
08/29/2024 |
Surface Water |
Increase of 29 color units from RSW-004 and RSW-005. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1132901 |
08/22/2024 |
Surface Water |
Increase of 24color units from RSW-004 and RSW-005. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1132900 |
08/06/2024 |
Surface Water |
Increase of 16 color units from RSW-004 and RSW-005. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1131328 |
07/31/2024 |
CAT1 |
Nitrate, Total (as N) Monthly Average limit is 10.0 mg/L and reported value was 15.0 mg/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1131327 |
07/31/2024 |
Surface Water |
Increase of 19 color units from RSW-004 and RSW-005. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1131326 |
07/17/2024 |
Surface Water |
Increase of 19 color units from RSW-004 and RSW-005. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1131325 |
07/02/2024 |
Surface Water |
Increase of 19 color units from RSW-004 and RSW-005. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
1130040 |
06/30/2024 |
CAT1 |
Nitrate, Total (as N) Monthly Average limit is 10.0 mg/L and reported value was 14.0 mg/L at EFF-001. |
Violation |
N |
eSMR |
San Luis Obispo WWTP |
399576 |
R3-2014-0033 |
N |
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