Two little girls help a Navajo family get running water in this video that will turn on your water works (so, have a tissue handy).

Isabelle and Katherine Kei Adams started their nonprofit Paper for Water when they were just eight and five years old, making and selling origami Christmas ornaments. In the four years since, the siblings have raised $800,000 to deliver clean water to 100 communities in 12 countries.

More than one million people in the U.S. have no running water. Families on the Navajo Reservation in Smith Lake, New Mexico depend on water deliveries for cooking, drinking and bathing needs, but the Kei Adams sisters are making life easier for many. One family, in particular, was given the surprise of a lifetime—and the joy was captured on camera.

Derrick can't stop wiping away the tears as he and his wife turn on a kitchen faucet for the first time — and realize what it will mean for their own children.

"Not everyone is as fortunate as we are to have clean water," young Isabell says in the video below.  "But now, at least one more family does."

(WATCH the big surprise below)

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