The USG had&#x2F;has a store the National Helium Reserve [1]. It was being sold off so I am unsure how much is still in it, but to answer your question you store it underground.<p>Edit. It looks that the National Helium reserve will be sold off by 2018 [2].<p>1. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;National_Helium_Reserve" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;National_Helium_Reserve</a><p>2. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Helium_production_in_the_United_States" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Helium_production_in_the_Unite...</a>