**Introduction** Sewage cleanup services play a crucial role in maintaining public health and sanitation. These services are essential for removing and treating wastewater from residential, commercial, and industrial properties. By effectively managing sewage, these services prevent the spread of disease, protect the environment, and ensure access to clean water. **Sewage Treatment** Sewage treatment involves several stages to remove contaminants and harmful microorganisms from wastewater. This process includes: * **Preliminary Treatment:** Removes large solids such as debris, rags, and plastics. * **Primary Treatment:** Settling tanks are used to remove settleable solids and organic matter. * **Secondary Treatment:** Biological processes, such as activated sludge or trickling filters, break down sewage into smaller organic compounds. * **Tertiary Treatment:** Advanced technologies, like membrane filtration or chemical precipitation, further remove dissolved pollutants. **How Clean is Water After Sewage Treatment?** Sewage treatment processes are highly effective in removing contaminants from wastewater. After treatment, water meets stringent standards for purity and can be reused for irrigation, industrial processes, or discharged back into water bodies. However, the level of cleanliness may vary depending on factors such as the type of treatment plant, influent sewage quality, and local regulations. Some of the common parameters measured to assess water quality after sewage treatment include: * **Total Suspended Solids (TSS):** Measure of solids remaining in the water. * **Biochemical Oxygen Demand (BOD):** Measure of organic matter that consumes dissolved oxygen. * **Turbidity:** Measure of cloudiness or haziness. * **Fecal Coliform Bacteria:** Measure of potential pathogens.