Humans generate and pass large quantities of fecal coliform, including E. coli, along with organic material into a septic system.
In EPA/625/R-00/008, the EPA defines several standard measurements for septic tank performance. One of these measurements is BOD5, or biological oxygen demand.
It is one of the most stressful, time consuming, irritating and, potentially, one of the most expensive problems a homeowner deals with: septic tank problems. Unfortunately, many homeowners do not understand how a septic system works and mistakenly assume their septic tank is the culprit.