Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

JavaScript appears to be disabled on this computer. Please click here to see any active alerts.

Sole Source Aquifers for Drinking Water

Sole Source Aquifers

Under the Safe Drinking Water Act, EPA's SSA program enables the Agency to designate an aquifer as a sole source of drinking water and establish a review area.

Overview

What is a sole source aquifer (SSA)?
What is the SSA program?
EPA’s authority to designate SSAs
SSA contacts by EPA Region

Petition for SSA Designation

Guidance on petitioning for SSA designation

SSA Project Review

Project review coordination and MOU's
Project review steps
Projects excluded from review
Opportunities for public awareness and participation
Limitations of the SSA program
EPA Region 4 is piloting a Sole Source Aquifer (SSA) project review form

SSA Locations

Interactive map of SSAs
Geospatial data set