Revise local board of health sanitation powers and rules

HB 658 would have limited local health boards' authority to create sanitation rules stricter than state standards, affecting communities that previously could enforce tougher local requirements. It specifically protected existing subsurface wastewater systems (like septic systems) from being subject to new local rule changes. The bill amended Montana law (sections 50-2-116 and 50-2-130) to remove local boards' ability to adopt more stringent sanitation regulations and to ensure current systems remain exempt from future rule updates. This change would have shifted regulatory authority toward state standards for wastewater and sanitation compliance.