The Lake County Division of Environmental Health permits and inspects all septic tank pumper trucks and chemical toilet service providers that work in the county on an annual basis. The pumper trucks are inspected to ensure they are clean, sanitary, and watertight. The operators must also submit monthly service records for the pumping of septic tanks and chemical toilets. If you notice a septic pumper truck leaking sewage on the roadway, please call our office at 707-263-1164. Every pumper truck has a truck registration number and the business name must be displayed for identification. How often your tank will need pumping depends largely on the size of the tank, the number of people in the household, and the kinds of appliances you use. As a general rule, tanks should be cleaned every three to four years, but the period can vary considerably. The best procedure is to have your tank inspected annually and have it pumped as necessary.