Water Quality Resources

This section is designed to connect landowners, growers, and community members with trusted information and tools related to water quality in Mendocino and Lake Counties. Whether you're looking to better understand your water test results, identify potential contaminants, or find certified labs for water sampling, you'll find helpful resources here.

We’ve compiled guidance documents, factsheets, and links to state and federal agencies, as well as local and regional resources to support your water quality management goals. This includes information on:

Common water quality concerns in our region (e.g., iron, boron)
Best practices for protecting and improving water quality
Recommended water testing laboratories in Northern California
Interpretation guides for agricultural and drinking water quality
Support programs for domestic well users, small water systems, and technical assistance providers

Whether you’re managing irrigation for crops, maintaining a private well, or preparing for drought resilience, these resources are here to support informed decision-making and sustainable practices.