The size of the on-site market is very large. Approximately 25% of all new homes built each year have on-site treatment. That equates to over 400,000 new homes annually. This doesn’t include schools, office parks, malls, public entities, etc. According to a 2003 U.S. census survey there are more than 21 million households using septic tanks or cesspools for treatment. The same survey reports that 339,000 of those systems had reported breakdowns of the system within the prior 3 months.