Glyphosate use in San Francisco County, California
There is no 2019 estimate of farm glyphosate use for San Francisco County, California.
The estimates cover cropland only, and the source has no cropland value for this county.
See San Francisco County on the mapAbout these numbers
The main number is the county's estimated farm glyphosate use for the year divided by all of its land, water left out. A county with a little farmland can use a lot per square mile of cropland and still have far less in total than a county with more farmland, so the whole-county number is the one the map colors, ranks and compares.
These are county estimates, not records. They don't show which fields were sprayed or how much any one field got.
California's numbers are the state's own reported use, which USGS uses in place of an estimate, so the low and high numbers are the same.
Per square mile of cropland is the same total spread evenly over the county's cropland only, so it's higher than the whole-county number wherever only part of San Francisco County, California is farmland.
Numbers are in pounds per square mile. The source gives kilograms per square kilometer, and 1 kg per km² is about 5.7 pounds per square mile.
Source: Hengl & Brungard from USGS county estimates, 2000–2019 (CC BY 4.0). Land area: US Census Bureau, 2020.
This page shows estimated farm use only. It says nothing about health and is not medical advice.