What is the typical pH range for domestic wastewater described for sanitary sewer?

• A. 5.0-6.0
• B. 7.5-8.5
• C. 6.5-7.5
• D. 4.0-5.0

Answer: (C)

pH tells you how acidic or basic wastewater is, and this property affects pipe corrosion, scaling, and how treatment processes operate. Domestic wastewater that enters a sanitary sewer is typically near neutral, around 6.5 to 7.5. This near-neutral range minimizes corrosion of metal and concrete while staying within the range that most treatment steps expect. Values well below neutral (like 5.0–6.0 or 4.0–5.0) are more acidic and can aggressively attack pipes and infrastructure, whereas values well above neutral (such as 7.5–8.5) are less common for ordinary domestic waste and can pose their own handling or treatment challenges. So, the near-neutral range of about 6.5 to 7.5 best describes typical domestic wastewater for sanitary sewer systems.