Membership in the Society is open to any person interested in Humic Substances and Natural Organic Matter regardless of residence, citizenship or age. Memberships are entered and renewed on a calendar basis. Membership applications received before October 1 will be made effective in the current year while applications received after October 1 will be made effective January 1 of the following year unless otherwise requested. Membership benefits include the IHSS Newsletter and a discounted registration fee for the biannual IHSS Conference. To join IHSS submit this application along with the required payment. IHSS will not share your information with any other organization. The Humic Substances Society is organized into 25 chapters based on regions or countries If there are enough members from one country that chapter may have the country name otherwise the chapter will have a regional name. Select your country from the list below and the computer will place you in the correct chapter. If your country is not on the list please select "other" which is the "Rest of World" chapter.

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 Member Due 2024
 Retired Member Due 2024
 Student Member Due 2024