Key Takeaway
Santa Margarita Aggregates is a active surface mine producing SandAndGravel, located in Santa Margarita, San Luis Obispo County, CA. It has 162 violations on record (42 S&S) and $104K in proposed penalties. Operated by Martin Marietta Northern California Aggregates,LLC.
Santa Margarita Aggregates
Operator: Martin Marietta Northern California Aggregates,LLC
Controller: Martin Marietta Materials Inc
Location: Santa Margarita, San Luis Obispo County, CA
Employees: 13
Recent Violations
View all 162 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 02/25/2026 | 56.16005 | Non-S&S | LowNegligence | $0 |
| 08/28/2025 | 56.20003(b) | Non-S&S | ModNegligence | $151 |
| 08/28/2025 | 56.20003(a) | Non-S&S | ModNegligence | $151 |
| 07/09/2024 | 56.14205 | Non-S&S | LowNegligence | $239 |
| 02/14/2024 | 56.11001 | S&S | HighNegligence | $3,103 |
| 02/14/2024 | 56.14107(a) | Non-S&S | ModNegligence | $147 |
| 11/29/2022 | 56.12019 | Non-S&S | LowNegligence | $133 |
| 11/29/2022 | 56.20003(a) | Non-S&S | LowNegligence | $133 |
| 11/29/2022 | 56.14107(a) | Non-S&S | ModNegligence | $133 |
| 05/03/2022 | 56.12002 | Non-S&S | LowNegligence | $296 |
| 05/03/2022 | 56.14112(b) | Non-S&S | LowNegligence | $661 |
| 05/03/2022 | 56.12032 | Non-S&S | LowNegligence | $296 |
| 01/26/2022 | 56.20003(a) | S&S | ModNegligence | $2,194 |
| 01/26/2022 | 56.20003(a) | Non-S&S | ModNegligence | $442 |
| 01/26/2022 | 56.11012 | Non-S&S | ModNegligence | $661 |
| 01/26/2022 | 56.20003(a) | S&S | ModNegligence | $2,194 |
| 01/26/2022 | 56.18002(a)(1) | S&S | ModNegligence | $2,194 |
| 04/28/2021 | 56.12041 | Non-S&S | ModNegligence | $416 |
| 04/28/2021 | 56.14107(a) | Non-S&S | LowNegligence | $125 |
| 04/28/2021 | 56.14132(a) | Non-S&S | LowNegligence | $187 |
Accidents & Injuries
View all 14 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 08/26/2022 | SLIP OR FALL OF PERSON | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 12/07/2021 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | None |
| 06/27/2017 | MACHINERY | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 09/30/2015 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 25d restricted |
| 03/23/2015 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 06/06/2013 | POWERED HAULAGE | DAYS RESTRICTED ACTIVITY ONLY | 151d restricted |
| 02/04/2013 | OTHER | INJURIES DUE TO NATURAL CAUSES | None |
| 09/28/2010 | OTHER | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 11/14/2008 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 09/03/2008 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 64d restricted |
Inspections
View all 71 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/25/2026 | 02/25/2026 | 8.00 | 1 |
| 08/28/2025 | 08/28/2025 | 15.25 | 1 |
| 10/21/2024 | 10/22/2024 | 17.75 | 1 |
| 07/09/2024 | 07/09/2024 | 8.75 | 1 |
| 02/14/2024 | 02/15/2024 | 12.00 | 1 |
| 08/16/2023 | 08/16/2023 | 2.00 | 1 |
| 08/16/2023 | 08/16/2023 | 4.00 | 1 |
| 05/17/2023 | 05/17/2023 | 1.25 | 1 |
| 11/28/2022 | 11/30/2022 | 27.50 | 1 |
| 05/02/2022 | 05/05/2022 | 26.25 | 1 |
Mine Details
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Frequently Asked Questions
How many MSHA violations does Santa Margarita Aggregates have?
Santa Margarita Aggregates has 162 MSHA violations on record, of which 42 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $104K.
What type of mine is Santa Margarita Aggregates?
Santa Margarita Aggregates is a Surface mine producing SandAndGravel, located in Santa Margarita, San Luis Obispo County, CA. It currently has 13 employees.
Has anyone been injured or killed at Santa Margarita Aggregates?
According to MSHA records, Santa Margarita Aggregates has 14 reported accident/injury records and 0 fatalities on file.
Who operates Santa Margarita Aggregates?
Santa Margarita Aggregates is operated by Martin Marietta Northern California Aggregates,LLC and controlled by Martin Marietta Materials Inc. MSHA Mine ID: 0401616.