California Department of Conservation
04/27/2026 | News release | Distributed by Public on 04/27/2026 13:13
Map Sheet 52: Aggregate Sustainability in California (2026)
Aggregate Sustainability in California
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Map Sheet 52: Aggregate Sustainability in California. Click the map to open a high-resolution JPG image in a new tab.
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Overview
To meet its housing and infrastructure development needs, California consumes an average of approximately 145 million tons of construction aggregate per year. Construction aggregate-sand, gravel, and crushed stone-provide the bulk and strength to portland cement concrete, asphaltic concrete, Class II base, and other aggregate commodities such as subbase, drain rock, and fill. Aggregate normally provides 80 to 100 percent of the material volume in these uses.
Aggregate materials are essential to modern society, both to maintain the existing infrastructure and to provide for new construction. Because aggregate is a low unit-value, high-bulk-weight commodity, it must be obtained from nearby sources to minimize economic and environmental costs associated with transportation. These factors make information about the availability and demand for aggregate valuable to land-use planners and decision makers charged with planning for a sustainable future for California's citizens.
Map Sheet 52
Map Sheet 52 is a statewide overview of projected future aggregate needs and currently permitted reserves. The purpose of the map is to compare projected aggregate demand for the next fifty years with currently permitted aggregate reserves in various regions of the state. The map also shows the projected years of permitted reserves remaining, and highlights regions where fewer than ten years of permitted aggregate supply remain. The current estimates of permitted aggregate reserves, aggregate demand, and years of permitted reserves remaining are based on conditions as of January 1, 2024.
Download Map Sheet 52 and its companion report below.
- Map Sheet 52 - Aggregate Sustainability in California (2026) (21 MB PDF)
- Supplement to Map Sheet 52: Aggregate Sustainability in California (2026) (900 KB PDF)
NOTE: Aggregate reserves and projected aggregate demand shown on Map Sheet 52 are compiled from mineral land classification reports published by the CGS between 1979 and 2025. Although the statewide and regional information presented on the map and in the supplement may be useful to decision-makers, it should not be used as the sole basis for local land-use decisions. The more detailed information contained in each of the aggregate studies employed in the compilation of Map Sheet 52 should be used for local land-use and decision-making purposes.
Archive of Map Sheet 52 Versions
Map Sheet 52 was originally published in 2002 and subsequently updated in 2006, 2012, and 2018. The 2026 map is an update of the version published in 2018. Past versions are available below for comparison.
- 2018 map (4 MB PDF) and 2018 supplement (300 KB PDF)
- 2012 map (4 MB PDF) and 2012 supplement (600 KB PDF)
- 2006 map (22 MB PDF) and 2006 supplement (500 KB PDF)
- 2002 map (12 MB PDF) and 2002 supplement (2 KB PDF)
Web page by:
California Geological Survey - Mineral Resources Program
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California Department of Conservation published this content on April 27, 2026, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on April 27, 2026 at 19:13 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]