In Wisconsin, the water entering an onsite system shall not exceed monthly averages of:BOD (biochemical oxygen demand) – 220 mg/LFOG (fats, oil and grease) – 30mg/LTSS (total suspended solids) – 150 mg/LAnything that exceeds these numbers is considered high-strength waste and should not go into an onsite system unless pretreated to come down to these numbers. Where do we typically find high-strength waste?Typically, high-strength waste will come from food preparation — school kitchens, church kitchens, commercial kitchens, food manufacturing plants, etc. And high strength is not always food-related. If a building will service vehicles, Wisconsin does not want the waste from
