Skip to main content
U.S. flag

An official website of the United States government

Where can I find detailed sampling methods for surface water and groundwater?

The National Field Manual for the Collection of Water-Quality Data (National Field Manual) provides guidelines and standard procedures for USGS personnel who collect data used to assess the quality of the Nation’s surface water and groundwater resources. The manual is published as separate chapters.

Learn more: Techniques of Water-Resources Investigations Reports