The Sp. Gravity of sewage is 

Explanation:

Properties of sewage

1. Specific Gravity

• Generally, the specific gravity of municipal sewage lies between 1.2 to 1.4 which is slightly greater than 1.

2. pH 

• The pH of fresh sewage is more than 7 (the average range is 7.5 - 9.5) and fresh sewage is alkaline in nature.
• The pH of septic sewage is less than 7 (the average range is 6.5 - 4.5) and septic sewage is acidic in nature.