Data / Mines / California / Irwindale Plant
Irwindale Plant: 80 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Irwindale Plant is an active construction sand and gravel surface mine in Los Angeles County, California, operated by United Rock Products Corp with 35 employees on MSHA's record (mine ID 0401763). Since January 1, 2022 MSHA inspectors issued 80 citations and orders there with $72,921 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Irwindale Plant (MSHA mine ID 0401763) in Los Angeles County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0401763
- Status
- Active since January 24, 1973
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Los Angeles County, California
- Nearest town
- Irwindale
- Operator
- United Rock Products Corp
- Employees
- 35
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 80
- Significant and substantial
- 11 (13.8%)
- Closure orders
- 0
- High negligence or reckless
- 6
- Proposed penalties
- $72,921
- Amount paid so far
- $31,618
- Inspections
- 23
- Inspector hours on site
- 257
- Citations per inspection
- 3.48 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- August 19, 2026
- Citations issued to contractors here
- 1 ($159 proposed)
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 16 | 1 | $3,343 | 0 |
| 2023 | 23 | 1 | $11,575 | 0 |
| 2024 | 14 | 3 | $22,683 | 0 |
| 2025 | 18 | 3 | $19,751 | 0 |
| 2026 | 9 | 3 | $15,569 | 0 |
Standards cited most at Irwindale Plant
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.20011 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12023 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12068 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 2 |
Other open mines in Los Angeles County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Coast Aggregates Big Rock Creek | Coast Aggregates | Los Angeles County, CA | Sand, common | 22 | 71 |
| Littlerock Quarry | Hi-Grade Materials | Los Angeles County, CA | Construction sand and gravel | 13 | 59 |
| Big Rock Creek Quarry | Granite Construction Company | Los Angeles County, CA | Sand, industrial | 5 | 14 |
| Holliday Rock-Little Rock Plant | Holliday Rock Company Inc | Los Angeles County, CA | Construction sand and gravel | 16 | 13 |
| Irwindale Aggregates | Hanson Aggregates LLC | Los Angeles County, CA | Construction sand and gravel | 43 | 12 |
| Palmdale | Robertson's Ready Mix Ltd | Los Angeles County, CA | Construction sand and gravel | 10 | 11 |
| Pebbly Beach Quarry | Connolly-Pacific Company | Los Angeles County, CA | Crushed, broken stone | 19 | 10 |
| Acton Clay Quarries | North Star Minerals Inc | Los Angeles County, CA | Clay, ceramic, refractory mnls. | 3 | 9 |
| Palmdale Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 15 | 5 |
| Durbin Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 38 | 4 |
| Peck Road Gravel Pit | S L S & N Inc | Los Angeles County, CA | Construction sand and gravel | 7 | 4 |
| Reliance Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 35 | 3 |
| Sylmar Site | C & M Topsoil, Inc. | Los Angeles County, CA | Sand, common | 4 | 3 |
| 75TH Street Quarry and Recycling | 75TH Street Quarry and Recycling | Los Angeles County, CA | Sand, common | 2 | 3 |
| Azusa Rock | Azusa Rock, LLC | Los Angeles County, CA | Crushed, broken stone | 12 | 1 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.