"As a native population, it is sacred for us and the idea that people in the area are using water from springs to water their garden is something that doesn't sit well with us."
Eleanor, the leader of the tribe's Barbanero-Ventrua branch, has invited the couple – who have son Archie, 2, and 3-week-old daughter Lilibet – to meet them and discuss alternative options.
She said: "It would be great if they came so we could explain our history and culture and let them know about how sacred the water is to us.
"It would be good to explain to them that if they are using the water to irrigate their garden, they have an alternative choice."
Human remains, thought to be from a member of the tribe, were discovered near Harry and Meghan's home earlier this month.
The exact address where they were found hasn't been made public, but the area is believed to be less than 400 yards from the Montecito mansion where the family live.