If you are looking for a low-cost toilet block option where there is no local sewer connection then a waterless toilet with a sealed pump out vault could be an ideal option.
FIBRE REINFORCED POLYMER (FRP) BUILDING WITH DRY VAULT TOILET SYSTEM
The benefits are that they are generally low maintenance and little or no power demand, and no potential for environmental impact.
As long as the location is within service distance of septic tank pump-out service contractors, flushing toilets are not required and are a perfect fit when coupled with our FRP Buildings. Precast concrete tanks are readily available from local suppliers and the dry vault can be emptied by pump out trucks as required.