Year Model years requiring a test. 2014 1990, 1992, 1994, 1997, 1999, 2001, 2003, 2005, 2007. 2015 1991, 1993, 1995, 1996, 1998, 2000, 2002, 2004, 2006, 2008. 2016 1992, 1994, 1997, 1999, 2001, 2003, 2005, 2007.
An important pest of livestock and horses throughout the western United States. In California, this tick is frequently found in the warm, dry regions of the central valley down to the southern portion of the state. Rarely, these ticks have been found on humans, dogs, cats, and sheep.
Dermacentor occidentalis (Pacific Coast tick) Overview. Pacific Coast ticks are human-biting ticks with a broad host range, found predominantly in shrublands, chaparral, and along trails from Oregon to northern Baja California and Mexico.