| CHESAPEAKE BAY TRUST | TAMPA, FL | program funder | 3 |
| THE KEITH CAMPBELL FOUNDATION FOR THE ENVIRONMENT INC | BETHESDA, MD | program funder | 3 |
| WESTERN PENNSYLVANIA CONSERVANCY | PITTSBURGH, PA | program funder | 3 |
| AMERICAN WATER CHARITABLE FOUNDATION INC | CAMDEN, NJ | program funder | 2 |
| HIGH FOUNDATION | LANCASTER, PA | program funder | 2 |
| KENTFIELDS FOUNDATION INC | BALTIMORE, MD | program funder | 2 |
| LANCASTER COUNTY COMMUNITY FOUNDATION | LANCASTER, PA | program funder | 2 |
| NORTH AMERICAN ASSOCIATION FOR ENVIRONMENTAL EDUCATION | WASHINGTON, DC | program funder | 2 |
| VIRGINIA ENVIRONMENTAL ENDOWMENT | RICHMOND, VA | program funder | 2 |
| ABRAMSON FAMILY FOUNDATION | JUPITER, FL | program funder | 1 |
| AGUA FUND INC | FRONT ROYAL, VA | program funder | 1 |
| ALLIANCE FOR THE CHESAPEAKE BAY INC | ANNAPOLIS, MD | program funder | 1 |
| AMERICAN FORESTS | WASHINGTON, DC | program funder | 1 |
| ANNA AND HARRY H BORUN TUA | SAINT LOUIS, MO | program funder | 1 |
| ANNE BROSSMAN SWEIGART CHARITABLE FOUNDATION | LANCASTER, PA | program funder | 1 |
| ARCONIC FOUNDATION | PITTSBURGH, PA | program funder | 1 |
| ARTHUR W PERDUE FOUNDATION INC | WILMINGTON, DE | program funder | 1 |
| BARBOURTOWN FOUNDATION | WEST HARTFORD, CT | program funder | 1 |
| BAXA FAMILY FOUNDATION | WILMINGTON, DE | program funder | 1 |
| BENJAMIN SHEIN FOUNDATION FOR HUMANITY | PHILADELPHIA, PA | program funder | 1 |
| BLUE SKY FAMILY FOUNDATION | CHESTER SPRGS, PA | program funder | 1 |
| BLUE YAK FOUNDATION ELIZABETH GODLEY SPENCE TTEE | KENNETT SQ, PA | program funder | 1 |
| BOUDINOT FOUNDATION | MALVERN, PA | program funder | 1 |
| BRISTLE CONE PINE FOUNDATION TR | WILMINGTON, DE | program funder | 1 |
| BROWN ADVISORY CHARITABLE FOUNDATION INC | BALTIMORE, MD | program funder | 1 |