There are many things that a septic service in Johnston company can offer to keep your septic tank running smoothly. They offer in-tank inspection with pumping. This includes locating the septic tank and pumping the content and inspecting its structure. Company crews may also perform a water load test to observe and monitor flow through the system to identify visual flow impediments. Septic tank inspection can cost you around $300 to $500 while locating the tank can cost you $25 and septic pumping can cost around $380 up to $3,000 depending on the amount of sludge that will be pumped.