The Ewiiaapaayp Tribe is a federally recognized Indian Tribe and Ewiiaapaayp Indian Reservation established on February 10, 1891, following the executive order of January 12, 1891, and Act of the U.S. Congress (26 Stat. 712 - 714 c.65). The Ewiiaapaayp Tribe, also known as the Cuyapaipe Band of Mission Indians, is a self-governing, federally recognized Indian Tribe exercising sovereign authority over the lands of the Ewiiaapaayp Indian Reservation. The Ewiiaapaayp Reservation is divided between a 4,102-acre land parcel near Mt. Laguna that is approximately 47 miles east of San Diego and 19 miles east of Alpine, and a 10-acre land parcel at 4054/4058 Willows Road in Alpine, CA, an unincorporated community of east San Diego County.

The Ewiiaapaayp Indian Reservation consists of two sections, the Ewiiaapaayp Indian Reservation in the Laguna Mountains consisting of 4,102.5-acres reserved in trust patent in 1891, and the Little Ewiiaapaayp Indian Reservation in the community of Alpine consisting of 10-acres reserved in trust patent in 1986 (8.6-acres) and 1998 (1.4-acres).

The Little Ewiiaapaayp Reservation consists of an 8.6-acre parcel located at 4058 Willows Road in Alpine, which was established in trust on April 1, 1986, and a 1.42 -acre parcel located at 4054 Willows Road, which was established in trust in 1998. This trust land is located approximately ¼ mile east of the West Willows Road exit off of Interstate 8 in the Community of Alpine. The Ewiiaapaayp Tribe's Tribal Government office currently resides on the 1.4-acre parcel. The Little Ewiiaapaayp Reservation is leased to the Southern Indian Health Council, Inc. ("SIHC, Inc."), an inter-tribal corporation of seven (7) Kumeyaay tribes that services the health care needs of its member tribes and non-Indians in east San Diego County.

On December 27, 2000, Congress enacted the California Indian Land Transfer Act of 2000 that will someday add 432 acres to the Ewiiaapaayp Reservation, all of which are on ridge tops or in steep slopes. The addition of these 432 acres to the Ewiiaapaayp Indian Reservation is still pending.

The Ewiiaapaayp Indian Reservation consists of 4,102 acres in the Laguna Mountains, roughly 12 miles north of Interstate 8. One percent of the Reservation is arable land, while the remaining 99% of the Reservation consists of rocky ridges and steep hillsides between 5,000 and 6,500 feet. Access to the Reservation is via a 12-mile, narrow, steeply graded, winding and poorly maintained dirt road that crosses federal land, county land and fee land with two intervening gates. There are no public utilities available on the Reservation, including no telephone service, no mobile telephone or radio service, no electricity, no gas, no treatment system for wastewater, solid waste, or drinking water.

Seven tribal members are enrolled. Due to the inaccessibility of the Ewiiaapaayp Reservation, the US government established an Indian school (since closed) on the more accessible Campo Reservation. Ewiiaapaayp Tribe families with school age children were re-located from the Ewiiaapaayp Reservation to the other reservations of Campo, La Posta, Laguna (since terminated), and Manzanita in order for children to attend the school. The involuntary relocation of the Ewiiaapaayp families with children to other reservations, and subsequent dis-enrollments due the lack of utilities, inadequate roads, substandard housing, and the absence of any kind of employment opportunity, is the reason the Ewiiaapaayp Tribe's enrollment consists of seven (7) members today. Ewiiaapaayp tribal members have many relatives, including brothers, sisters, uncles, aunts, nieces, nephews, sons and wives, enrolled in other Kumeyaay tribes, including Viejas, Barona, Sycuan, Manzanita, La Posta, Jamul, and Campo.