Environmental Factors

Soil erosion caused by rooting pigs--non native to the park.
Soil erosion is colossal in a rainforest climate where non native pigs have ravaged the ground cover on steep slopes.

NPS photo by Bryan Harry


Rainforests on Haleakalā's steep windward slopes receive as much as 120 inches of annual rainfall. These forests are stable and enduring when not subject to depredation by pigs and goats. Ungulate's rooting and grazing quickly break down the native plant cover triggering devastating erosion. Such landscape scale erosion on tropical mountain slopes devastates both the native biodiversity and the island's precious groundwater reserve.

But Haleakalā upper elevations are now free of pigs and goats, and serves as a core area in the East Maui Watershed Partnership to protect this native rainshed and its groundwater from this destruction.

Last updated: April 23, 2016

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Haleakalā National Park
PO Box 369

Makawao, HI 96768


808 572-4400

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