Requires the Indiana department of health (state department) or the executive board of the state department to adopt, revise, update, or repeal rules concerning residential and nonresidential onsite sewage systems. Alters who may vote on the technical review panel, the process to resolve a tie vote, and when the panel may meet. Provides that the technical review panel may not approve an ordinance concerning residential onsite sewage systems unless certain conditions are met. Voids certain ordinances. Provides that certain updates to rules concerning residential and nonresidential onsite sewage systems are subject to standard rulemaking procedures.