In 2007 the EPA estimated 50% of rural and 47% of suburban housing units were served by septic. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P1004624.TXT https:

In 2007 the EPA estimated 50% of rural and 47% of suburban housing units were served by septic. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P1004624.TXT https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P1004624.TXT