MASSACHUSETTS 

 AGRICULTURAL EXPERIMENT STATION 



BULLETIN 446 FEBRUARY 1948 



Septic Tank Studies 



By James E. FuUei' 



This bulletin reports a study of the operating efficiency of septic tanks when 

 sewage is retained for periods less than the 24 hours usually recommended. 

 Management observations and chemical and biological tests gave evidence in 

 favor of the conventional practise of holding sewage in tanks for 24 hours or more. 



UNIVERSITY OF MASSACHUSETTS 

 AMHERST, MASS. 



