Sunserra at Crescent Bar is a new, 207-home resort community on the Columbia River in Washington. A lagoon system treats wastewater from more than 400 existing houses.
The four most recent resort developments have community septic systems. John Glassco of Eco-nomic in Ephrata, Wash., designed the last three. State Department of Ecology restrictions prevented enlarging the lagoon system, and Sunserra was too far away for a gravity sewer to reach.