STP vs ETP – What Is the Difference?

Understand the difference between sewage treatment plant (STP) and effluent treatment plant (ETP) in terms of application, cost, technology and compliance.

Why STP and ETP Are Often Confused

STP and ETP are both wastewater treatment systems, but they serve completely different purposes. Many project owners mistakenly install the wrong system, leading to compliance failure and operational issues.

STP vs ETP – Core Differences

STP (Sewage Treatment Plant)

Treats domestic wastewater
Used in societies, hotels, hospitals
Lower COD & TDS

ETP (Effluent Treatment Plant)

Treats industrial wastewater
Used in factories & industries
High COD, chemicals & toxicity

STP vs ETP Cost Comparison

  • ✔ STP cost: ₹35,000 – ₹80,000 per KLD
  • ✔ ETP cost: ₹60,000 – ₹2,00,000 per KLD
  • ✔ ETP cost is higher due to chemicals & customization

Where STP and ETP Are Used

STP Applications

Residential societies
Hotels & hospitals
Educational institutions

ETP Applications

Pharma & chemical plants
Textile & food industries
Manufacturing units

Need Help Choosing Between STP and ETP?

A2Z Enviro Services evaluates wastewater characteristics, compliance requirements and future expansion before recommending the correct treatment system.

Consult Our Engineers
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