Changes to the state’s septic system rules require counties to implement their own ordinances by February 2010. Otter Tail County is one of the first to issue its rules for systems treating up to 5,000 gpd. The changes include new inspection criteria for existing systems, increased tank size for new systems, and 15 percent larger tanks for households with garbage disposers and dishwashers.The ordinance also states that new septic tanks must be marked with their capacities and insulated if installed less than two feet below grade. Furthermore, covers must weigh at least 95 pounds or be locked and bolted. The
