Toyota uses a seal in their water pumps that may seep coolant and leave a build up around the weep hole. This does NOT mean the pump is bad, unless you are having to add coolant to the system. If there is no noticeable coolant loss, the indications of leakage at the weep hole is fairly normal. If coolant is being loss, the pump will need replacement. With the belt, age is a factor as well as wear. At eight years, replacement would be normal.