The project challenged inventors to come up with a toilet that operated without running water, electricity or a septic system.

BBC: Bill Gates looks to new toilets to improve world sanitation

If you want sewerage service, you have a septic system.

NPR: New Jersey Skirts Affordable Housing Law

The county says Mr. Conway must rebuild or tear down his cabins, barn, kitchen, blacksmith shop and sawmill, and create a septic system before hosting any more classes and camps.

WSJ: Ah, Wilderness! Mountain Man vs. the Building Inspector

Levels of phosphates in fresh waterways can be much higher than normal because of contamination from municipal and domestic wastewater, whether you're hooked up to a sewer or have a septic system, says Helen Suh MacIntosh, an associate professor in environmental health at Harvard University.

FORBES: Environmental Activists Get Under Your Sink