Onion Creek Farm has over 20 years experience using Sun-Mar composting toilets. We currently have three Sun-Mar Excel model self-contained units in three separate baths.

Sun-Mar is the acknowledged world leader in composting toilet technology. These toilets come in two basic configurations: self-contained units and centrex units which are used in conjunction with ultra-lowflush recreational vehicle style toilets.

Joe Lynch has been the Iowa dealer for Sun-Mar for 15 years. He will happy to consult with you on choosing the appropriate model to meet your needs and answer installation questions you may have for your application.


Email us at This e-mail address is being protected from spambots. You need JavaScript enabled to view it and ask for the free 30-page Sun-Mar catalogue or visit Sun-mar.com for online details and demonstration video.

Sun-Mar also sells a line of backyard Garden Composters that really work! Details can also be found at Sun-mar.com.