When this added sewage or extra water is sent to the sewer pipe, it will surcharge even more, eventually pushing back into someone’s basement. If more sewage than this tries to get through the pipe in the street, the sewage will surcharge and start filling up the sewer lateral pipes that run to the sewer main from houses. As you can imagine, there is only so much sewage that can flow through this pipe.įor this size of sewer pipe, about 300 gallons of water can flow through it in a minute. This low slope condition is very common in Pennsylvania’s sewer collection systems. This means that for every 100 feet of pipe, the pipe goes downhill less than 5 inches. Many 8 inch sewer pipes are installed with a slope of 0.4%. Usually, the sanitary sewer pipe in the street is only 8 inches in diameter, and often the pipe slope is not very steep. Sanitary sewer pipes are designed to carry sewage, not groundwater and rain water. In addition to the fact that connecting sump pumps to the sanitary sewer is illegal, it causes big problems! Sump pumps are designed to pump groundwater and rainwater. Sump Pumps into the Sanitary Sewer Cause Big Problems!
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