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Institutional & Fiduciary Information

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Mailing Address

Headwaters & Marine Stewards
24 Sheffield Rd
Portsmouth, NH 03801-4838

  • Federal Tax Status: 501(c)(3) Public Charity (Contributions are tax-deductible under IRC § 170)
  • Federal EIN: 41-2696973
  • State Registration: Registered Charitable Trust with the New Hampshire Department of Justice, Charitable Trusts Unit
  • State Business ID: NH Secretary of State #1010318
  • National Accountability Rating: Candid (GuideStar) Platinum Seal of Transparency

Helpful Quick Links

  1. Need Fiduciary Documents or W-9?
    Download our IRS 501(c)(3) determination letter, NH Good Standing certificate, and signed W-9 on our Governance & Transparency portal.
  2. Interested in the 2027 Classroom Pilot?
    Review our 10-module Ridge-to-Reef architecture on the Curriculum Roadmap or join the reference module review list on our Educator FAQs.
  3. Corporate Matching & Micro-Grants?
    Learn how to sponsor the sUAS Archimedes, the HPS Sculpin build, or an entire digital module on our Support Page.