The Missouri Department of Natural Resources describes a Pump Contractor business as:

A person engaging in the business of installing, removing or serving pumps and pumping equipment on or in water wells, vaults, cesspools and septic tanks. A pump contractor may also clean or pump waste from a private sewage disposal system, portable toilet, portable hand-washing unit or holding tank or hauls or dispose wastes from such equipment. Pump contractors or pumper installers does not include a person who also constructs water wells as a driller, well driller, drilling contractor or water well contractor.

You may need some or all of the following permits for a Pump Contractor business:

Water icon
Public Drinking Water Construction Permit

If your business plans to construct a public water system that will supply drinking water to the public, you must obtain a Public Drinking Water Construction Permit. You must obtain this permit if you also plan to complete the following construction projects to the water system: waterline extensions, waterline replacements, drilling water supply well, construction a storage tank, adding a disinfection system, treatment changes, building a pump station or other improvements or modifications. A public water system has at least 15 service connections or serves at least 25 people at least 60 days out of the year. If your business plans to connect to a permitted public water system, then you are not required to obtain this permit.
Water icon
Public Drinking Water Permit to Dispense

If your business plans to operate a public water system that supplies drinking water to the public, you must obtain a Public Drinking Water Permit to Dispense. A public water system has at least 15 service connections or serves at least 25 people at least 60 days out of the year. If your business plans to connect to a permitted public water system, then you are not required to obtain this permit.
Waste icon
Scrap Tire Processing Facility Permit

If your business plans to operate a facility to reduce the volume of scrap tires by shredding, cutting, buffing, chipping, baling or otherwise altered so they can be recycled, used for resource recovery or disposed of, you will be required to apply for a Scrap Tire Processing Facility Permit.