| C40 CITIES CLIMATE LEADERSHIP GROUP INC | $73,614,205 | C02 | published | shelter: homeless | New York, NY | 2024 |
| ALLIED CLIMATE PARTNERS INC | $66,539,772 | C02 | published | | New York, NY | 2024 |
| WEST CAROLINA RURAL TELEPHONE | $34,370,845 | C02 | inferred 0.50 | | Abbeville, SC | 2024 |
| WATER ENVIRONMENT FEDERATION | $31,015,734 | C02 | published | science: research education | Alexandria, VA | 2024 |
| ACTIVATE GLOBAL INC | $30,637,585 | C02 | published | launch: launch | Berkeley, CA | 2024 |
| SJCOG INC | $13,428,443 | C02 | published | | Stockton, CA | 2024 |
| GENESEE VALLEY CONSERVANCY INC | $13,004,107 | C02 | published | | Geneseo, NY | 2025 |
| WATER ENVIRONMENT RESEARCH FOUNDATION | $8,631,710 | C02 | inferred 0.85 | | Alexandria, VA | 2013 |
| NEW HAMPSHIRE RECYCLES | $7,843,586 | C02 | published | | Epsom, NH | 2024 |
| CALIFORNIA WATER ENVIRONMENT ASSOCIATION | $6,644,301 | C02 | published | | Oakland, CA | 2024 |
| WASHINGTON MARITIME BLUE | $4,776,219 | C02 | published | | Seattle, WA | 2024 |
| REGIONAL CITIZENS ADVISORY COUNSEL | $4,384,720 | C02 | published | science: research education | Anchorage, AK | 2024 |
| INTERNATIONAL CONSERVATION FOUNDATION | $3,912,906 | C02 | published | | Riverside, CA | 2024 |
| CLIMATE CONSERVATION | $3,781,863 | C02 | published | launch: launch | Bozeman, MT | 2024 |
| CENTER FOR WATERSHED PROTECTION | $3,779,842 | C02 | published | | Fulton, MD | 2024 |
| CONSERVATION STRATEGY FUND | $3,700,432 | C02 | published | | Arcata, CA | 2024 |
| MOONSHOT MISSIONS INC | $3,667,981 | C02 | published | | Bethesda, MD | 2024 |
| EARTH DAY NETWORK INC | $3,344,612 | C02 | published | women: issues | Washington, DC | 2024 |
| INITIATIVE FOR RESPONSIBLE MINING ASSURANCE | $2,740,746 | C02 | published | | Seattle, WA | 2024 |
| ILLINOIS RURAL WATER ASSOCIATION | $2,693,898 | C02 | inferred 0.50 | | Taylorville, IL | 2024 |
| ZENDER ENVIRONMENTAL HEALTH ANDRESEARCH GROUP CO | $2,642,437 | C02 | published | | Anchorage, AK | 2024 |
| URBAN GREEN COUNCIL | $2,590,941 | C02 | published | | New York, NY | 2024 |
| CLIMATE ACTION SYSTEMS INC | $2,515,278 | C02 | published | | Bolinas, CA | 2023 |
| BLUEGRASS REGIONAL RECYCLING CORPORATION | $2,229,719 | C02 | published | | Richmond, KY | 2024 |
| NORTHERN CALIFORNIA RESOURCE CENTER | $2,180,999 | C02 | published | | Fort Jones, CA | 2024 |
| WHOLESOME WAVE INC | $2,117,782 | C02 | published | women: issues | Bridgeport, CT | 2024 |
| LEONARDO ACADEMY INC | $1,993,681 | C02 | inferred 0.70 | | Madison, WI | 2022 |
| KENTUCKY WATERWAYS ALLIANCE INC | $1,888,426 | C02 | published | | Louisville, KY | 2025 |
| NEW YORK WATER ENVIRONMENT ASSOCIATION INC | $1,799,281 | C02 | published | science: research education | Syracuse, NY | 2024 |
| LOUISIANA WILDLIFE AND FISHERIES FOUNDATION | $1,628,029 | C02 | published | | Baton Rouge, LA | 2025 |
| SOLANA CENTER FOR ENVIRONMENTAL INNOVATION | $1,577,427 | C02 | published | | Encinitas, CA | 2024 |
| WATER ENVIRONMENT ASSOCIATION OF TEXAS | $1,564,543 | C02 | published | | Austin, TX | 2024 |
| FLORIDA WATER RESOURCES CONFERENCE INC | $1,557,230 | C02 | published | science: research education | Merritt Is, FL | 2024 |
| ASSOCIATION OF CLEAN WATER ADMINISTRATORS | $1,514,093 | C02 | published | | Washington, DC | 2024 |
| THE ASCENT PROJECT INC | $1,197,452 | C02 | published | | Atlanta, GA | 2024 |
| UNITED STATES SOCIETY ON DAMS | $1,158,527 | C02 | published | | Knightdale, NC | 2025 |
| HAMMOND CLIMATE SOLUTIONS FOUNDATION | $1,055,968 | C02 | published | | La Jolla, CA | 2024 |
| COMPACT OF CAPE COD CONSERVATION TRUSTS INC | $975,723 | C02 | published | | Barnstable, MA | 2024 |
| HAWAII WATER ENVIRONMENT ASSOCIATION | $952,876 | C02 | published | | Honolulu, HI | 2024 |
| SOUTHERN MAINE CONSERVATION COLLABORATIVE | $948,699 | C02 | published | | Portland, ME | 2025 |
| MEXIA WATER SYSTEM INC | $918,076 | C02 | published | | Mexia, AL | 2024 |
| POWER A CLEAN FUTURE OHIO | $885,510 | C02 | published | | Columbus, OH | 2025 |
| CENTER FOR SUSTAINABLE INFRASTRUCTURE | $862,394 | C02 | published | | Olympia, WA | 2024 |
| CONSERVATION CONSULTANTS INC | $805,109 | C02 | inferred 0.50 | | Pittsburgh, PA | 2019 |
| GREEN CORPS INC | $802,778 | C02 | published | | Denver, CO | 2024 |
| NEVADA RURAL WATER ASSOCIATION | $792,406 | C02 | inferred 0.50 | | Carson City, NV | 2021 |
| SCIENCE & ENVIRONMENTAL HEALTH NETWORK | $718,608 | C02 | published | science: research education | Jamestown, ND | 2025 |
| MUNICIPAL WASTEHUB | $716,578 | C02 | published | | Orono, ME | 2024 |
| A PLACE CALLED HOME RESIDENTAL LIVING INC | $699,473 | C02 | published | | Indianapolis, IN | 2023 |
| OPEN SOURCE ECOLOGY | $689,928 | C02 | published | | Maysville, MO | 2025 |
| CODE REDD | $641,636 | C02 | published | | Mill Valley, CA | 2023 |
| EDWARD STREET DAY CARE CENTER INC | $607,296 | C02 | published | | Worcester, MA | 2024 |
| CENTRAL STATES AIR RESOURCE AGENCIES ASSOCIATION | $585,413 | C02 | published | | Austin, TX | 2024 |
| VIRGINIA WATER ENVIRONMENT ASSOCIATION INC | $570,125 | C02 | published | | Glen Allen, VA | 2024 |
| COMMUNITY SCIENCE INSTITUTE INC | $561,548 | C02 | published | science: research education | Ithaca, NY | 2025 |
| ROCKY MOUNTAIN WATER ENVIRONMENT ASSOC | $539,782 | C02 | published | | Denver, CO | 2024 |
| MISSOURI WATER ENVIRONMENT ASSOCIATION INCORPORATED | $529,733 | C02 | published | science: research education | Jefferson Cty, MO | 2025 |
| DRIVESAFE NATIONAL ROAD SAFETY ASSOCIATION INC | $496,596 | C02 | inferred 0.50 | | Wichita, KS | 2022 |
| INTERNATIONAL EMISSIONS TRADING | $488,735 | C02 | inferred 0.50 | | Washington, DC | 2024 |
| BAY PLANNING COALITION | $475,693 | C02 | inferred 0.60 | | Lafayette, CA | 2024 |
| CLIMATE ASIA INC | $471,692 | C02 | published | women: issues | Chestnut Hill, MA | 2025 |
| ONONDAGA ENVIRONMENTAL INSTITUTE INC | $458,814 | C02 | published | science: research education | Dewitt, NY | 2025 |
| CENTER FOR SOCIAL SUSTAINABLE SYSTEMS | $422,492 | C02 | published | | Albuquerque, NM | 2024 |
| HANCOCK COUNTY PLANNING COMMISSION | $412,315 | C02 | published | | Ellsworth, ME | 2024 |
| WILDLIFE & OUTDOOR RECREATION FOUNDATION INC | $402,666 | C02 | published | science: research education | Red Oak, NC | 2025 |
| GROUNDWIRE | $399,292 | C02 | inferred 0.55 | | Seattle, WA | 2012 |
| FRIENDS OF RED ROCK CANYON | $363,800 | C02 | published | | Las Vegas, NV | 2024 |
| SKAGIT WATERSHED COUNCIL | $363,757 | C02 | published | | Mount Vernon, WA | 2024 |
| TEACH GREEN CHARITABLE FOUNDATION | $358,277 | C02 | published | | Nashua, NH | 2024 |
| GREEN ROUNDTABLE INC | $351,676 | C02 | inferred 0.70 | | Boston, MA | 2011 |
| OUR WORLD UNDERWATER SCHOLARSHIP SOCIETY | $328,808 | C02 | published | science: research education | Woodridge, IL | 2024 |
| CLEAN WATER PROFESSIONALS OF KENTUCKY & TENNESSEE | $325,932 | C02 | published | | Prospect, KY | 2024 |
| NATIONAL FISH HABITAT FUND INC | $322,190 | C02 | published | | Washington, DC | 2025 |
| WASTECAP RESOURCE SOLUTIONS INC | $318,727 | C02 | published | | Milwaukee, WI | 2024 |
| UNITED STATES GREEN BUILDING COUNCIL | $304,996 | C02 | inferred 0.50 | | Washington, DC | 2011 |
| IOWA LAND IMPROVEMENT CONTRACTORS ASSN | $299,404 | C02 | inferred 0.60 | | Des Moines, IA | 2024 |
| NEBRASKA WATER ENVIRONMENT ASSOC | $299,109 | C02 | published | | Wahoo, NE | 2024 |
| ILLINOIS WATER ENVIRONMENT ASSOCIATION | $294,733 | C02 | published | | Chicago, IL | 2024 |
| LAND USE RESOURCE CENTER | $291,332 | C02 | published | | Boulder, CO | 2024 |
| CENTER FOR SCIENCE IN PUBLIC PARTICIPATION | $274,535 | C02 | published | | Bozeman, MT | 2025 |
| ANALYSIS PLANNING AND MANAGEMENT INSTITUTE INC | $267,888 | C02 | published | science: research education | Culpeper, VA | 2022 |
| NATIVE AMERICAN WATER ASSOCIATION | $265,733 | C02 | inferred 0.60 | | Minden, NV | 2024 |
| EASTERN HEATING AND COOLING COUNCIL INC | $258,176 | C02 | inferred 0.70 | | Mount Laurel, NJ | 2016 |
| FUTURE WEST | $257,397 | C02 | published | | Bozeman, MT | 2023 |
| Environment Maryland Research & Policy | $248,340 | C02 | inferred 0.80 | | Baltimore, MD | 2014 |
| ENVIRONMENTAL & ENERGY COUNCIL OF MAINE | $236,917 | C02 | published | | Augusta, ME | 2024 |
| HUSSAIN FOUNDATION INC | $223,794 | C02 | published | | Chantilly, VA | 2024 |
| SOLID WASTE ASSOCIATION OF NORTH AMERICA | $221,873 | C02 | inferred 0.80 | | Alpharetta, GA | 2025 |
| SOUTHERN ENVIRONMENTAL ENFORCEMENT TRAINING FUND | $203,079 | C02 | published | science: research education | East Point, GA | 2025 |
| PASSAIC RIVER COALITION | $202,868 | C02 | published | | Morristown, NJ | 2025 |
| ECO-SCHOOL NETWORK | $189,907 | C02 | published | science: research education | Portland, OR | 2024 |
| WISCONSIN LOCAL GOVERNMENT CLIMATE COALITION INC | $186,815 | C02 | published | | Madison, WI | 2024 |
| PAUL F BRANDWEIN INSTITUTE INC | $167,550 | C02 | published | science: research education | Port Jervis, NY | 2024 |
| OUTDOOR COMMUNITY PARTNERS | $165,547 | C02 | published | | Whitefish, MT | 2025 |
| MISTRYLAND | $150,000 | C02 | published | | Santa Clara, CA | 2025 |
| OREGON TREE FARM SYSTEMS INC | $146,358 | C02 | published | | Eugene, OR | 2025 |
| SOLID WASTE ASSOCIATION OF NORTH AMERICA | $146,098 | C02 | inferred 0.70 | | Phoenix, AZ | 2024 |
| ASKS INC | $138,079 | C02 | published | | Shady Side, MD | 2021 |
| MOTHER OF CORALS | $108,704 | C02 | published | | Denver, CO | 2025 |
| MALAMA HAMAKUA MAUI | $108,381 | C02 | published | | Haiku, HI | 2024 |