Wastewater arising from activities in the community has created a problem for the community is very much present in the source water pollution and cause the loss of ecosystems. Wastewater is generated each day will be about 80-90 percent of the amount of water each user. (Average water use in daily activities is 200 liters per person per day), when the population increases. Wastewater was increasing as well. Experimental wastewater treatment, wastewater treatment, we will use the EM Ball in front of the home of one of the researchers. Found that treatment of waste water by EM Ball resulting sewage smell and the water is murky. Switch to the water to run clear. But the stench EM Ball, which showed that there are errors in the third car, which we will introduce errors to improve the efficiency in the use of EM Ball maximum. And how to treat wastewater more effectively in the future.