Koʻolau Mountains Watershed Partnership (KMWP) is a voluntary alliance of major public and private landowners working since 1999 to protect the forested mauka or mountainous areas of the Koʻolau Mountains on Oʻahu. Spanning nearly 100,000 acres, with an estimated sustained yield of over 133 billion gallons of water each year, the Koʻolau watershed is integral to the island’s present and future water supply. KMWP performs a critical mission in coordinating management across the large partnership area to protect the watershed against incipient invasive weeds and feral animals. Preserving what remains of our native watershed forests is critical for maintaining the usefulness and value of the watershed in perpetuity.