County deep-dive · snapshot 2026-05-14

San Joaquin County

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30,316

parcels scored

810k

acres covered

Moderate

dominant band

26%

acres in Elevated band or higher

Water context

San Joaquin’s water profile

San Joaquin draws from Sierra runoff via the Stanislaus, Mokelumne, and Calaveras systems plus the Eastern San Joaquin subbasin. Pre-1914 surface rights cushion most district acreage; the Delta-Mendota corridor — returned to DWR in April 2026 — softens the rest.

Risk distribution

Acres by band

San Joaquin’s farmable acreage broken down across the five risk bands.

Low

123k ac · 15.1%

Moderate

473k ac · 58.5%

Elevated

204k ac · 25.2%

High

9k ac · 1.1%

Severe

0 ac · 0.0%

What is grown

Top crop classes in San Joaquin

Sourced from California Department of Water Resources Land IQ and the U.S. Department of Agriculture (USDA) Cropland Data Layer.

Permanent — high water (almonds, walnuts, pistachios)

203k acres

Annuals — low water (wheat, sorghum)

196k acres

Annuals — medium water (tomatoes, melons, vegetables)

125k acres

Vineyards

95k acres

Plus 154k acres classified as fallow or non-cropped — rangeland, dry-farmed acreage, and undeveloped agricultural parcels not in active production.

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