| Violation ID |
Occurred Date |
Violation Type |
(-) Violation Description |
Corrective Action |
Status |
Classification |
Source |
| 1151395 |
02/10/2026 |
DMON |
Failed to conduct inspections and collect purge stabilization parameters during the 2025 first and second semi-annual monitoring events. Violation of Board Order R6T-2009-0023, MRP II.A.1.d and MRP II.B.3.
|
Discharger did not propose corrective actions. The groundwater wells are required to be inspected semi-annually, and the purge stabilization parameters are required to be collected semi-annually during each sampling event. |
Violation |
B |
Report |
| 1151373 |
02/10/2026 |
DMON |
Failing to maintain a Title 27 detection monitoring program. Violation of Board Order R6T-2009-0023, WDR section II.B. |
Discharger has not proposed corrective actions which should include a time schedule for well installation. Water Board staff are working with Modoc County and the Office of Enforcement to ensure that a Title 27 compliant monitoring network is installed and the groundwater aquifer will be monitored in a manner that is protective of water quality. |
Violation |
A |
Report |
| 1151396 |
02/10/2026 |
Deficient Reporting |
Failed to report aquifer characteristics, 5-yr COC monitoring data, corrective measures to correct violations, and financial assurance information during the 2025 reporting period. Violation of Board Order R6T-2009-0023, MRP II.B.2., MRP II.B.5, MRP IV.A.2.d, WDR V.B, MRP IV.E. |
Discharger has not proposed or identified corrective actions. The aquifer characteristics are required to be collected semi-annually, the most recent 5-Yr COC sampling data is required to be included in each report, a discussion related to violations including a detailed time schedule for correction must be included, and the amount of financial assurance to implement a Known and Reasonably Foreseeable Release to groundwater and conduct post-closure monitoring is required. |
Violation |
B |
Report |
| 1151392 |
10/16/2025 |
GWAT |
Exceeded the MCL for Nitrate as N in groundwater well OB-1 during the 2025 first and second semi-annual sampling events. Violation of Board Order R6T-2009-0023, WDR section I.A.2. |
Discharger has not proposed or identified corrective actions. Discharger should install a T27 detection monitoring network with wells installed within the upper most aquifer. Currently the site has one well able to be sampled but the well is installed within the vadose zone with a seasonal water bearing zone. |
Violation |
B |
Report |
| 1149448 |
11/19/2024 |
DMON |
Failed to sample groundwater during the 2024 monitoring period. Violation of Board Order R6T-2009-0023, MRP section II.B. |
Water Board and Office of Enforcement staff are working to bring the County into compliance with groundwater monitoring requirements. |
Violation |
B |
Report |
| 1129038 |
12/31/2023 |
DMON |
Failed to monitor the groundwater during the 2023 first and second semi-annual groundwater monitoring event. Violation of Board Order R6T-2009-0023, MRP section II.B and WDR section II.B. |
The Discharger submitted a groundwater well replacement workplan and compliance schedule on 05/17/2021. The workplan and time schedule were accepted on 07/29/2021. The Discharger indicates that the wells will be installed in phases as soon as funding is obtained and a contract can be awarded. Lahontan Water Board staff are working with the Discharger to have the wells installed in a timely manner. |
Violation |
B |
Report |
| 1149433 |
11/16/2022 |
DMON |
Failed to sample groundwater during the 2022 second semi-annual monitoring event. Violation of Board Order R6T-2009-0023, MRP section II.B. |
Water Board and Office of Enforcement staff are working to bring the County into compliance with groundwater monitoring requirements. |
Violation |
B |
Report |
| 1149431 |
05/24/2022 |
DMON |
Failed to sample groundwater for all parameters listed for the 2019 5-Year Constituent of Concern sampling event. Violation of Board Order R6T-2009-0023, MRP section I.B.5. |
Water Board and Office of Enforcement are working to bring the discharger to compliance. There currently is only one well at the Facility that is able to produce water. The one well is currently going dry. All other wells have gone dry. Discharger must install replacement wells. |
Violation |
B |
Report |
| 1149432 |
05/24/2022 |
GWAT |
Exceeded the MCL for Nitrate as N in groundwater well OB-1 during the 2022 first semi-annual sampling event. Violation of Board Order R6T-2009-0023, WDR section I.A.2. |
Water Board staff and Office of Enforcement are working with the Discharger (Modoc County) to bring the Facility into compliance. The Facility currently only has one well that is going dry. All other wells have gone dry. Facility does not have a T27 CCR compliant detection monitoring progra. |
Violation |
B |
Report |
| 1087340 |
01/31/2022 |
Order Conditions |
Failed to install replacement groundwater monitoring wells to investigate unauthorized releases from the landfill. Violates Board Order R6T-2009-0021. |
Modoc County confirmed on May 11, 2022 that the wells will be installed on May 23, 2022. |
Violation |
A |
Inspection |
| 1149472 |
12/28/2021 |
GWAT |
Exceeded the primary maximum contaminant level for Nitrate as N (10 mg/L) during the 2021 second semi-annual monitoring event in one (1) groundwater well, OB-1. Violation of Board Order R6T-2009-0023, WDR section I.A.2. |
Discharger did not propose or identify corrective actions. |
Violation |
B |
Report |
| 1149473 |
06/22/2021 |
DMON |
Failed to sample groundwater for all monitoring parameters during the 2021 first semi-annual monitoring event. Violation of Board Order R6T-2009-0023, MRP section II.B.4. |
Discharger has not proposed corrective actions. Water Board staff and Office of Enforcement are working to bring the County into compliance with the detection monitoring program. |
Violation |
B |
Report |
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Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
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