Key Takeaway
Langley Hill Quarry is a active surface mine producing Stone, located in WOODSIDE, San Mateo County, CA. It has 84 violations on record (21 S&S) and $10K in proposed penalties. Operated by Langley Hill Quarry.
Langley Hill Quarry
Operator: Langley Hill Quarry
Controller: Michael W Dempsey; Patrick K Dempsey
Location: WOODSIDE, San Mateo County, CA
Employees: 4
Recent Violations
View all 84 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 10/29/2025 | 56.4101 | Non-S&S | LowNegligence | $151 |
| 10/29/2025 | 56.9300(b) | Non-S&S | ModNegligence | $151 |
| 01/22/2025 | 56.9300(a) | Non-S&S | ModNegligence | $151 |
| 01/22/2025 | 56.14100(b) | Non-S&S | ModNegligence | $151 |
| 01/22/2025 | 56.14100(b) | Non-S&S | LowNegligence | $151 |
| 02/27/2024 | 50.30(a) | Non-S&S | LowNegligence | $147 |
| 09/14/2023 | 56.14107(a) | Non-S&S | LowNegligence | $143 |
| 09/14/2023 | 50.30(a) | Non-S&S | LowNegligence | $143 |
| 03/15/2023 | 56.6132(a)(7) | Non-S&S | LowNegligence | $143 |
| 08/04/2020 | 56.13011 | Non-S&S | ModNegligence | $123 |
| 10/23/2019 | 56.9300(b) | Non-S&S | ModNegligence | $121 |
| 03/05/2019 | 47.41(a) | Non-S&S | ModNegligence | $121 |
| 03/05/2019 | 56.9300(b) | S&S | ModNegligence | $319 |
| 03/07/2018 | 56.20003(a) | Non-S&S | ModNegligence | $118 |
| 03/07/2018 | 56.12013(b) | Non-S&S | ModNegligence | $118 |
| 05/31/2017 | 56.16001 | Non-S&S | ModNegligence | $116 |
| 02/13/2017 | 56.11012 | S&S | ModNegligence | $305 |
| 02/13/2017 | 56.14107(a) | Non-S&S | ModNegligence | $116 |
| 02/13/2017 | 56.4601 | Non-S&S | ModNegligence | $116 |
| 02/07/2017 | Non-S&S | $0 |
Inspections
View all 64 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 10/28/2025 | 10/29/2025 | 17.75 | 1 |
| 06/24/2025 | 06/25/2025 | 8.00 | 1 |
| 01/21/2025 | 01/22/2025 | 14.50 | 1 |
| 07/31/2024 | 07/31/2024 | 11.75 | 1 |
| 02/27/2024 | 02/27/2024 | 5.25 | 1 |
| 09/14/2023 | 09/15/2023 | 9.75 | 1 |
| 03/15/2023 | 03/15/2023 | 6.50 | 1 |
| 08/29/2022 | 08/30/2022 | 10.25 | 1 |
| 02/15/2022 | 02/16/2022 | 15.25 | 1 |
| 08/19/2021 | 08/20/2021 | 14.25 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Langley Hill Quarry have?
Langley Hill Quarry has 84 MSHA violations on record, of which 21 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $10K.
What type of mine is Langley Hill Quarry?
Langley Hill Quarry is a Surface mine producing Stone, located in WOODSIDE, San Mateo County, CA. It currently has 4 employees.
Has anyone been injured or killed at Langley Hill Quarry?
According to MSHA records, Langley Hill Quarry has 0 reported accident/injury records and 0 fatalities on file.
Who operates Langley Hill Quarry?
Langley Hill Quarry is operated by Langley Hill Quarry and controlled by Michael W Dempsey; Patrick K Dempsey. MSHA Mine ID: 0400170.