Zach Errett worked as a referee at the 2012 London Olympics and the 2016 Rio de Janeiro Olympics and from 2002 to 2022 was a referee at the Senior World Championships and the United States Olympic Trials.

A licensed USA Wrestling Officials Association referee for more than 30 years and a United World Wrestling referee for more than 20 years, he was a UWW referee instructor and a member of the referee commission. Instrumental in the development of the "Referee Education Pathway" for UWW, Errett has served as UWW Education Manager since 2018 and has developed three courses for the training of national referees for national federations and was influential in starting the Referee Scholarship Program. He has delivered coaching and referee courses to national federations as a UWW educator since 2016.

In 2010, Errett was awarded the Golden Whistle by FILA/UWW at the Senior World Championships and he was also named USA Wrestling Officials Association Official of the Year. He received the Mort Geller award, which is presented to an individual who has demonstrated outstanding officiating skills on the International level and who is recognized as an outstanding clinician on the national level, from the USWOA in 2013.

USWOA presented him with the Glen Blackman Award, awarded to a new official who is working to improve and for recognition of outstanding accomplishments as a mat official and contributions to USA Wrestling, in 2000. The award is now called the Zach Errett Award.

Errett was also awarded the Phil Portuese award, which is presented to an individual who has gone above and beyond the normal to teach to the art of officiating, in 2014. The award is now named for Zach's father and is the Dave Errett Award.

Zach served as a member of the USA Wrestling Officials Association Executive Board from 2013 to 2023.

Errett has also served as the head wrestling coach and assistant football coach while also teaching science at Mooresville High School in Mooresville, Indiana from 2002 to 2013. He coached one Indiana state high school wrestling champion and four state place-winners while accumulating more than 100 dual meet victories. He was named Mid-State Conference Coach of the Year after leading his team to the conference championship in 2007, and was named Indiana High School Wrestling Coaches Association Regional Coach of the Year in 2010.

Errett served as the athletic director at Mooresville High School from 2013 to 2016, during which Mooresville hosted the Indiana High School Athletic Association sectional and regional wrestling tournaments and the 24-team Mooresville Holiday Classic.

After Mooresville, he was the head wrestling coach and taught science at Avon High School in Avon, Indiana from 2016 to 2021. At Avon, Errett coached three Indiana state high school wrestling champions and 10 state place-winners. He was named Hoosier Crossroads Coach of the Year after leading his team to a runner-up finish at the state tournament in 2019.

Errett has taught science at South Putnam High School in Greencastle, Indiana since 2021.

He wrestled for his father, David Errett, at Martinsville High School and had a career record of 104-25.