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slide 1 of 1 * ## 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.
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* What is a sole source aquifer (SSA)?
* What is the SSA program?
* EPA’s authority to designate SSAs
* SSA contacts by EPA Region
* Guidance on petitioning for SSA designation
* Project review coordination and MOU's
* Project review steps
* Projects excluded from review
* Opportunities for public awareness and participation
* Limitations of the SSA program
* Interactive map of SSAsExit EPA’s Website
* Geospatial data set
Contact Us About Sole Source Aquifers for Drinking Water to ask a question, provide feedback, or report a problem. Last updated on May 4, 2026 Welcome! Please share your feedback on how we can make www.epa.gov work better for you. A red asterisk (*) indicates a required field.
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