The high school educates students from a large geographic area including Grafton, Mequon, West Bend, Hartford, and Menomonee Falls.

[2] For the 2017-2018 school year, KMLHS received an Overall Accountability Rating of "Significantly Exceeds Expectations" from the Wisconsin Department of Public Instruction.

The high school was temporarily located at Christ Lutheran Church in the village of Jackson.

The construction of the 750-seat Performing Arts Center was the final step in the four-phase facility plan that began in 2001.

[8][9] In March 2003, a grant from Toyota Motor Sales allowed the school to install a windmill to aerate the wetlands, potentially increasing the facility's effectiveness.

[12][13][14] The school maintains a weather station as part of the SMART Weathernet on WITI Fox 6 TV in Milwaukee.

[15] KMLHS has clubs for chess, ecology, the fine arts, German, yearbook, math competitions, and sound and lighting work.

Kettle Moraine Lutheran High School offers basketball, cross-country, cheerleading, chess, soccer, fast-pitch softball, track, and volleyball for girls; and baseball, basketball, chess, cross country, football, golf, soccer, wrestling, and track for boys.

In 2007 the Chargers entered the playoffs for the first time, progressing to the championship game, which they lost to West Salem High School.

[22] The girls' volleyball team won consecutive Wisconsin Interscholastic Athletic Association state championships in 2002, 2003, 2004, and 2007.