Data / Nonprofits / Texas / San Marcos / Environment
Environment nonprofits in San Marcos, TX: 9 registered with the IRS
9 environment nonprofits are registered with the IRS in San Marcos, TX, 8 of them 501(c)(3) charities; the 4 that report revenue took in $394,527. The largest by revenue: San Marcos River Foundation Inc ($255,228), 3D Nature Technologies Inc ($102,137), San Marcos Greenbelt Alliance ($43,465).
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Every organization, largest by revenue first
| Organization | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|
| San Marcos River Foundation Inc | 501(c)(3) | 1987 | $255,228 | $4.2 million | 2025-12 |
| 3D Nature Technologies Inc | 501(c)(3) | 2022 | $102,137 | $175,908 | 2025-12 |
| San Marcos Greenbelt Alliance | 501(c)(3) | 2000 | $43,465 | $150,294 | 2025-12 |
| Ecosource Connect | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Gruene Orchid Society | 501(c)(5) | 2012 | $0 | $0 | 2025-12 |
| Sustainable San Marcos | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Texas Rivers Protection Association | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| The Eyes of the San Marcos River | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Mermaid Society SMTX Inc | 501(c)(3) | 2018 | $-6,303 | $1 | 2024-12 |
Other causes in San Marcos, TX
- Education 75
- Religion-related 46
- Arts, culture and humanities 35
- Human services 23
- Recreation and sports 17
- Public and societal benefit 13
- Community improvement and capacity building 12
- Philanthropy, voluntarism and grantmaking foundations 10
- Animal-related 7
- Youth development 6
- Health care 6
- Crime and legal-related 5
- Mutual and membership benefit 5
- International, foreign affairs and national security 5
- Civil rights, social action and advocacy 4
- Housing and shelter 4
- Employment 3
- Public safety, disaster preparedness and relief 3
- Mental health and crisis intervention 3
Every nonprofit in San Marcos, TX · Environment nonprofits across the state · Nonprofits in every city of the state
Read from the IRS Exempt Organizations Business Master File, updated by the IRS on October 24, 2026 and rebuilt here every morning. Revenue and assets are from each organization's latest filing as the IRS lists it; the IRS record is the official one. Organizations only: no people are named on these pages.