County deep-dive · snapshot 2026-05-14

Sonoma County

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39,535

parcels scored

962k

acres covered

Moderate

dominant band

5%

acres in Elevated band or higher

Water context

Sonoma’s water profile

Sonoma sits on a different aquifer regime than the San Joaquin Valley — Russian River alluvial groundwater plus a more reliable coastal climate. Vineyards on Tier 1 surface water dominate, and the band distribution reflects it.

Risk distribution

Acres by band

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

Low

13k ac · 1.4%

Moderate

901k ac · 93.7%

Elevated

48k ac · 5.0%

High

0 ac · 0.0%

Severe

0 ac · 0.0%

What is grown

Top crop classes in Sonoma

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

Annuals — low water (wheat, sorghum)
270k acres
Vineyards
180k acres
Annuals — medium water (tomatoes, melons, vegetables)
105k acres
Permanent — high water (almonds, walnuts, pistachios)
81k acres

Plus 306k acres classified as fallow or non-cropped — rangeland, dry-farmed acreage, and undeveloped agricultural parcels not in active production.

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