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

Active Surface SandAndGravel

Operator: Martin Marietta Northern California Aggregates,LLC

Controller: Martin Marietta Materials Inc

Location: Santa Margarita, San Luis Obispo County, CA

Employees: 13

162
Violations
42
S&S Violations
14
Accidents
$104K
Penalties

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

MSHA Mine ID0401616
Mine TypeSurface
StatusActive
CommoditySandAndGravel
SIC DescriptionConstruction Sand and Gravel
Employees13
Days/Week5.0
Hours/Shift8.0
Coordinates35.4177780, -120.5758330
Nearest TownSanta Margarita

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.