In Wisconsin, the water entering an onsite system shall not exceed monthly averages of:
BOD (biochemical oxygen demand) – 220 mg/L
FOG (fats, oil and grease) – 30mg/L
TSS (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
