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. |
1141237 |
03/02/2025 |
Late Report |
Monthly SMR ( MONNPDES ) report for January 2025 (2844639) was due on 01-MAR-25 |
Violation |
None |
Report |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1139609 |
12/05/2024 |
Groundwater |
The total and fecal coliform sample results were 12 MPN and 9.2 MPN, respectively. The limits for coliforms is 2.2 MPN for groundwater per permit Order R5-2020-0014. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1139608 |
12/03/2024 |
Groundwater |
The total coliform sample results for Monitoring Well 9 were 2.2 MPN. The limit for total coliforms is 2.2 MPN per Order R5-2020-0014. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1131521 |
07/22/2024 |
OEV |
pH 3-Sample Maximum limit is 8.5 SU and reported value was 8.64 SU at M-001. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1130282 |
06/13/2024 |
Groundwater |
The total coliform result for MW 11 was 2.2 MPN/100mL. The limit for groundwater monitoring wells is 2.2 MPN/100mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1130281 |
06/12/2024 |
Groundwater |
The total coliform result for MW 9 was 16.1 MPN/100 mL. The limit for groundwater monitoring wells is 2.2 MPN/100 mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1130239 |
06/11/2024 |
Deficient Monitoring |
there was no reportable minimum hourly UV average reading dose due to the manually closed re-aeration gate. The SCADA programming excludes all UV effluent parameters when the re-aeration gate is closed for reporting purposes. The CWIQS values for June 11th was deleted due to their being a zero reading for this day. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1130238 |
06/10/2024 |
Deficient Monitoring |
there was no reportable minimum hourly UV average reading dose due to the manually closed re-aeration gate. The SCADA programming excludes all UV effluent parameters when the re-aeration gate is closed for reporting purposes. The CWIQS values for June 10th was deleted due to their being a zero reading for this day. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1130237 |
06/12/2024 |
Deficient Reporting |
Due to the plant upset effluent flow was diverted to emergency storage facilities. Composite samplers could not operate on a flow proportional basis due to the loss of flow signal. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1130236 |
06/12/2024 |
Deficient Monitoring |
there was no reportable minimum hourly UV average reading dose due to the manually closed re-aeration gate. The SCADA programming excludes all UV effluent parameters when the re-aeration gate is closed for reporting purposes. The CWIQS values for June 12th was deleted due to their being a zero reading for this day. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1130235 |
06/08/2024 |
OEV |
Turbidity Instantaneous Maximum limit is 2.0 NTU and reported value was 2.8 NTU at FIL-002. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1123538 |
11/28/2023 |
Deficient Monitoring |
The Nitrate (as N) concentration for MW 11 was 39 mg/L which exceeds the drinking water standards of 10 mg/L for Nitrate (as N). |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1123537 |
11/27/2023 |
Groundwater |
MW 9 resulted in a total coliform organism level of 12 MPN/100mL which exceeded the limitation of 2.2 MPN/100mL per Order No. R5-2020-0014 Section V.B.1. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1123536 |
11/28/2023 |
Groundwater |
The Nitrate (as N) concentration for groundwater MW 5 was 17 mg/L which exceeds drinking water standards of 10 mg/L for Nitrate (as N). |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1120811 |
08/19/2023 |
Deficient Monitoring |
On August 18th the turbidity meter at FIL-002, which is post filtration, was left in an inoperable condition which caused an error in the continuous reading. The daily average and maximum reading for the 24 hour period are not reportable due to the inoperable state of the turbidity meter. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1118693 |
04/24/2023 |
Groundwater |
The total coliform organism limitation is 2.2 MPN/100mL and the result for monitoring well #2 was 5.1 MPN/100mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1118692 |
04/24/2023 |
Groundwater |
The coliform organism limitation is 2.2MPN/100mL and the result for monitoring well #9 was greater than 23 MPN/100mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1112912 |
12/13/2022 |
Groundwater |
The results for nitrate as N for groundwater MW #5 were 16 mg/L. The Groundwater Limitations under Waste Discharge requirements page 15 of permit Order R5-2020-0014 refer to primary or secondary MCLs established in Title 22 of the CCR and the limit is 10 mg/L. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1112911 |
12/13/2022 |
Groundwater |
The results for total coliform for groundwater MW #6 were >23 MPN/100mL. The Groundwater Limitations under Waste Discharge requirements page 15 of permit Order R5-2020-0014 are 2.2 MPN/mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1112910 |
12/12/2022 |
Groundwater |
The results for total coliform for groundwater MW #3 were >23 MPN/100mL. The Groundwater Limitations under Waste Discharge requirements page 15 of permit Order R5-2020-0014 are 2.2 MPN/mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1112909 |
12/12/2022 |
Groundwater |
The results for total coliform for groundwater MW #1 were 5.1 MPN/100mL. The Groundwater Limitations under Waste Discharge requirements page 15 of permit Order R5-2020-0014 are 2.2 MPN/mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1112908 |
12/12/2022 |
Groundwater |
The results for nitrate as N for groundwater MW #11 were 46 mg/L. The Groundwater Limitations under Waste Discharge requirements page 15 of permit Order R5-2020-0014 refer to primary or secondary MCLs established in Title 22 of the CCR and the limit is 10 mg/L. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1112907 |
12/12/2022 |
Groundwater |
The results for total coliform for groundwater MW #11 were >23 MPN/100mL. The Groundwater Limitations under Waste Discharge requirements page 15 of permit Order R5-2020-0014 are 2.2 MPN/mL. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1111617 |
12/21/2022 |
Deficient Monitoring |
From June 2020 to October 2022 the BOD and TSS removal efficiency was calculated and reported monthly, we did not report the calculations three times per week as the permit required. The data and calculations involved are present but were not uploaded on either the pet tool when that was being used for reporting purposes or the reports generated by Labworks. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1099985 |
12/31/2021 |
Deficient Monitoring |
The City of Merced was deficient in collecting samples for alkalinity series, Iron, Sodium, and Potassium of the standard minerals sample list. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1099984 |
11/15/2021 |
Groundwater |
Groundwater Monitoring Well #10 exceeded the total coliform limit of 2.2 MPN. The result for coliforms was 9.2 MPN. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1099983 |
11/15/2021 |
Groundwater |
Monitoring Well #9 exceeded the water quality limit for total coliforms of 2.2 MPN. The result was >23 MPN. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1099637 |
10/28/2021 |
Deficient Monitoring |
The City of Merced was unable to report results for Tributyltin at effluent M-001 and receiving water R-002U1 due to multiple QC issues at the contracted laboratory for this project. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1097431 |
10/27/2021 |
Deficient Monitoring |
Attachment E section III A.2 Table E-2 Influent Monitoring. states BOD mg/L 24 hour composite 3/Week, and TSS mg/L 24 composite 3/week. On October 27th the influent composite sample was divided up with one half of the sample used for annual priority pollutant testing and the remnant used for the three times per week testing for BOD and TSS. The sample was mixed in the composite jug and dispense into two smaller containers, incomplete mixing caused a non-representative sample to be used for BOD and TSS. The result for BOD was 179 mg/L and TSS was 78 mg/L, both of these results are significantly lower than normal results. The BOD and TSS test results for this day was deleted and not reported on CIWQS. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
1092709 |
06/28/2021 |
Groundwater |
The groundwater limitation for total coliform organism is 2.2 MPN/100mL per Order R5-2020-0014. Groundwater Monitoring Well No. 4 had a result of 9.2 MPN/100mL. MW 4 is located on the southside of the Land Application Area. |
Violation |
N |
eSMR |
Merced WWTF |
438006 |
R5-2020-0014 |
N |
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