| DUCKS UNLIMITED INC | $380,340,506 | C32 | published | | Memphis, TN | 2024 |
| FOUR LAKES TASK FORCE | $93,735,697 | C32 | published | | Midland, MI | 2025 |
| GREENACRES FOUNDATION | $54,214,539 | C32 | published | | Cincinnati, OH | 2025 |
| PELICAN COAST CONSERVANCY INC | $52,950,028 | C32 | published | science: research education | Mobile, AL | 2024 |
| KLAMATH RIVER RENEWAL CORPORATION | $49,804,763 | C32 | published | | Berkeley, CA | 2024 |
| OCEAN CONSERVANCY INC | $48,811,949 | C32 | published | science: research education | Washington, DC | 2024 |
| CALIFORNIA WATERFOWL ASSOCIATION | $40,114,931 | C32 | published | science: research education | Roseville, CA | 2025 |
| CHESAPEAKE BAY FOUNDATION INC | $35,411,298 | C32 | published | science: research education | Annapolis, MD | 2024 |
| SILVER CREEK WATER CORPORATION | $35,298,122 | C32 | inferred 0.50 | | Sellersburg, IN | 2024 |
| MARINE STEWARDSHIP COUNCIL | $35,073,707 | C32 | published | | United Kingdom | 2024 |
| THE BARN GROUP LAND TRUST INC | $33,689,832 | C32 | published | | Brooks, GA | 2024 |
| SUTTER MUTUAL WATER COMPANY | $28,024,274 | C32 | published | | Robbins, CA | 2024 |
| CATSKILL WATERSHED CORPORATION | $24,852,843 | C32 | published | | Arkville, NY | 2025 |
| WATER RESEARCH FOUNDATION | $24,332,001 | C32 | published | science: research education | Denver, CO | 2025 |
| WATER FOUNDATION | $22,281,949 | C32 | published | | Sacramento, CA | 2024 |
| WETLAND TRUST | $20,496,049 | C32 | published | | Ithaca, NY | 2024 |
| GALVESTON BAY FOUNDATION | $20,190,335 | C32 | published | science: research education | Kemah, TX | 2024 |
| GLOBAL FISHING WATCH INC | $19,122,848 | C32 | published | space: outer | Washington, DC | 2025 |
| SCENIC HUDSON INC | $18,552,461 | C32 | published | | Poughkeepsie, NY | 2024 |
| WATER INSTITUTE OF THE GULF | $17,473,902 | C32 | published | science: research education | Baton Rouge, LA | 2024 |
| WALKER BASIN CONSERVANCY | $16,737,301 | C32 | published | | Reno, NV | 2024 |
| BUZZARDS BAY COALITION INC | $15,706,365 | C32 | published | science: research education | New Bedford, MA | 2024 |
| DIGDEEP RIGHT TO WATER PROJECT | $14,596,293 | C32 | published | | Los Angeles, CA | 2025 |
| GLOBAL WATER CHALLENGE | $14,251,851 | C32 | published | women: issues | Arlington, VA | 2024 |
| WEST CREEK CONSERVANCY | $13,886,400 | C32 | published | | Parma, OH | 2024 |
| WINE TO WATER | $13,090,678 | C32 | published | girls boys: girls | Boone, NC | 2024 |
| SARDIS LONE ELM WATER SUPPLY | $12,673,707 | C32 | inferred 0.60 | | Midlothian, TX | 2025 |
| WESTERN RIVERS CONSERVANCY | $11,441,931 | C32 | published | | Portland, OR | 2024 |
| SHORERIVERS INC | $11,318,514 | C32 | published | science: research education | Easton, MD | 2025 |
| THE TRUST FOR TOMORROW | $10,768,152 | C32 | published | | Twin Bridges, MT | 2024 |
| IOWA CONFLUENCE WATER TRAILS | $10,430,095 | C32 | published | | Des Moines, IA | 2024 |
| MID KLAMATH WATERSHED COUNCIL | $10,396,094 | C32 | published | science: research education | Orleans, CA | 2025 |
| EARTH CONSERVANCY | $10,070,266 | C32 | published | | Ashley, PA | 2025 |
| FRIENDS OF POOL INC | $10,018,251 | C32 | published | science: research education | New York, NY | 2024 |
| CUMBERLAND RIVER COMPACT INC | $9,590,444 | C32 | published | | Nashville, TN | 2024 |
| SOUTH CAROLINA COASTAL CONSERVATION LEAGUE INC | $9,586,076 | C32 | published | | Charleston, SC | 2024 |
| SAFE WATER NETWORK | $9,062,782 | C32 | published | launch: launch | New York, NY | 2024 |
| REGIONAL WATER | $8,816,592 | C32 | inferred 0.45 | | Avoca, IA | 2025 |
| MESO-AMERICAN REEF FUND | $8,719,351 | C32 | published | | Guatemala | 2024 |
| COMMUNITY WATER CENTER | $8,690,157 | C32 | published | | Visalia, CA | 2024 |
| RESTORE AMERICAS ESTUARIES | $8,108,187 | C32 | published | science: research education | Washington, DC | 2024 |
| U S WATER ALLIANCE | $7,907,837 | C32 | published | | Washington, DC | 2024 |
| CALIFORNIA RURAL WATER ASSOCIATION | $7,157,113 | C32 | published | | Sacramento, CA | 2024 |
| SOUTH CAROLINA WATERFOWL ASSOCIATION | $7,130,067 | C32 | published | | Pinewood, SC | 2025 |
| SUPERIOR WATERSHED PARTNERSHIP | $7,079,657 | C32 | published | | Marquette, MI | 2024 |
| HUDSON RIVER FOUNDATION FOR SCIENCE AND ENVIRONMENTAL RESEARCH INC | $6,982,837 | C32 | published | science: research education | New York, NY | 2024 |
| COASTAL STATES STEWARDSHIP FOUNDATION | $6,706,511 | C32 | published | | Washington, DC | 2024 |
| OWAMNIYOMNI OKHODAYAPI | $6,512,575 | C32 | published | | Minneapolis, MN | 2025 |
| JAMES RIVER ASSOCIATION | $6,318,527 | C32 | published | | Richmond, VA | 2024 |
| BAY FOUNDATION OF MORRO BAY CALIFORNIA SAN LUIS OBISPO COUNTY | $6,205,280 | C32 | inferred 0.85 | | Morro Bay, CA | 2024 |
| SMITH RIVER ALLIANCE INC | $6,183,328 | C32 | published | | Crescent City, CA | 2025 |
| CURRENT INNOVATION NFP | $5,868,289 | C32 | published | | Chicago, IL | 2024 |
| SPLASH INTERNATIONAL | $5,772,077 | C32 | published | shelter: homeless | Seattle, WA | 2025 |
| THE CORAL REEF ALLIANCE | $5,749,831 | C32 | published | launch: launch | San Francisco, CA | 2024 |
| RIVERKEEPER INC | $5,707,926 | C32 | published | launch: launch | Ossining, NY | 2024 |
| HAWAIIAN ISLANDS LAND TRUST | $5,647,227 | C32 | published | | Honolulu, HI | 2024 |
| FRENCHMAN BAY CONSERVANCY | $5,365,396 | C32 | published | | Hancock, ME | 2024 |
| PROTECTORES DE CUENCAS INC | $5,191,540 | C32 | published | science: research education | Yauco, PR | 2025 |
| THE BIG SKY COMMUNITY ORGANIZATION | $5,112,525 | C32 | published | | Big Sky, MT | 2024 |
| DRIFTLESS AREA LAND CONSERVANCY INC | $5,075,153 | C32 | published | | Dodgeville, WI | 2025 |
| AMAZON FRONTLINES | $4,981,500 | C32 | published | space: for women | San Francisco, CA | 2024 |
| SUSTAINABLE OCEAN ALLIANCE INC | $4,897,663 | C32 | published | | San Francisco, CA | 2024 |
| SAVE THE BAY INC | $4,894,808 | C32 | published | science: research education | Providence, RI | 2024 |
| WOONASQUATUCKET RIVER WATERSHED COUNCIL | $4,889,250 | C32 | published | | Providence, RI | 2024 |
| TURPENTINE CREEK FOUNDATION INC | $4,845,075 | C32 | published | abuse: animal | Eureka Spgs, AR | 2025 |
| BISCAYNE BAY WATERKEEPER INC | $4,763,499 | C32 | published | science: research education | Coral Gables, FL | 2025 |
| AMAZON CONSERVATION ASSOCIATION | $4,751,861 | C32 | published | science: research education | Washington, DC | 2024 |
| BUFFALO NIAGARA WATERKEEPER INC | $4,734,854 | C32 | published | science: research education | Buffalo, NY | 2025 |
| FRESHWATER LAND TRUST | $4,678,840 | C32 | published | | Birmingham, AL | 2024 |
| FRIENDS OF RADNOR LAKE | $4,600,023 | C32 | published | | Nashville, TN | 2024 |
| CONNECTICUT RIVER WATERSHED COUNCIL INC | $4,589,728 | C32 | published | science: research education | Greenfield, MA | 2024 |
| WATERSHED CONSERVATION RESOURCE CENTER | $4,553,347 | C32 | published | | Fayetteville, AR | 2025 |
| NATURE COLLECTIVE | $4,340,994 | C32 | published | science: research education | Solana Beach, CA | 2024 |
| WATER WELL TRUST INCORPORATED | $4,125,596 | C32 | published | | Davidson, NC | 2025 |
| BAYKEEPER | $4,117,278 | C32 | published | science: research education | Oakland, CA | 2024 |
| DELAWARE BAY AND RIVER COOPERATIVE INC | $4,055,196 | C32 | published | | Boothwyn, PA | 2024 |
| SANTA ANA WATERSHED ASSOCIATION OF RCDS | $3,972,670 | C32 | published | | Riverside, CA | 2024 |
| BOND MADISON WATER COMPANY | $3,855,411 | C32 | published | | Pocahontas, IL | 2025 |
| TENNESSEE RIVER GORGE TRUST INC | $3,828,483 | C32 | published | | Chattanooga, TN | 2024 |
| IPSWICH RIVER WATERSHED ASSOCIATION INC | $3,827,775 | C32 | published | | Ipswich, MA | 2025 |
| MAINE COAST FISHERMENS ASSOCIATION | $3,802,491 | C32 | published | | Brunswick, ME | 2025 |
| NORTH CAROLINA WILDLIFE FEDERATION | $3,779,809 | C32 | published | | Raleigh, NC | 2025 |
| SAN JOAQUIN PARKWAY & CONSERVATION INC TR | $3,709,664 | C32 | published | | Fresno, CA | 2025 |
| SOUTH CAROLINA RURAL WATER ASSOCIATION | $3,695,775 | C32 | published | | Columbia, SC | 2025 |
| MID-COLUMBIA FISHERIES ENHANCEMENT GROUP | $3,683,911 | C32 | published | | White Salmon, WA | 2024 |
| THE COALITION TO RESTORE COASTAL LOUISIANA | $3,626,449 | C32 | published | science: research education | Baton Rouge, LA | 2024 |
| GUY HARVEY OCEAN FUND INC | $3,613,565 | C32 | published | science: research education | Fort Lauderdale, FL | 2024 |
| BLACK SWAMP CONSERVANCY | $3,564,187 | C32 | published | | Pemberville, OH | 2024 |
| BIG WOOD CANAL COMPANY | $3,555,786 | C32 | inferred 0.70 | | Shoshone, ID | 2024 |
| CENTER FOR THE INLAND BAYS INC | $3,535,864 | C32 | published | science: research education | Rehoboth, DE | 2024 |
| COLORADO RURAL WATER ASSOCIATION | $3,480,260 | C32 | inferred 0.60 | | Pueblo West, CO | 2024 |
| RESILIENT CITIES CATALYST INC | $3,475,914 | C32 | published | | Brooklyn, NY | 2024 |
| THE WETLANDS INITIATIVE | $3,465,450 | C32 | published | science: research education | Chicago, IL | 2024 |
| CONNETICUT MARITIME FOUNDATION INC | $3,463,617 | C32 | published | | Stonington, CT | 2025 |
| COASTAL RIVERS CONSERVATION TRUST | $3,437,817 | C32 | published | | Damariscotta, ME | 2024 |
| LITTLE MIAMI CONSERVANCY | $3,315,403 | C32 | published | | Loveland, OH | 2024 |
| UMPQUA BASIN WATER ASSOCIATION INC | $3,301,470 | C32 | inferred 0.35 | | Roseburg, OR | 2025 |
| COASTAL QUEST | $3,253,323 | C32 | published | science: research education | Berkeley, CA | 2024 |
| ST CATHERINES ISLAND FOUNDATION INC | $3,253,316 | C32 | inferred 0.80 | science: research education | Midway, GA | 2024 |
| PACIFIC COAST FISH WILDLIFE AND WETLANDS ASSOC | $3,206,599 | C32 | published | | Arcata, CA | 2025 |