Almost every industry in India needs permission from the State Pollution Control Board (SPCB) under the Water Act, 1974 and the Air Act, 1981. This permission comes in two stages:
- Consent to Establish (CTE) – before you start construction or install machinery
- Consent to Operate (CTO) – before you start production
Starting construction without CTE, or production without CTO, can lead to closure orders, disconnection of power and water, and penalties.
Step 1: Know your category
The Central Pollution Control Board (CPCB) classifies industries by their Pollution Index. The revised classification was issued in January 2025.
| Category | Pollution potential | Consent needed |
|---|---|---|
| Red | High | CTE + CTO |
| Orange | Medium | CTE + CTO |
| Green | Low | CTE + CTO (simplified in many states) |
| White | Negligible | No consent – only intimation to the Board |
| Blue | Essential environmental services (e.g. waste-processing facilities) | Consent as per pollution index, with 2 extra years of CTO validity |
Your category decides the fee, documents, inspection frequency and validity. States can modify the CPCB list, so always check your state board's category list.
Step 2: Consent to Establish (CTE)
Apply before construction. You will usually need:
- Project report with manufacturing process and capacity
- Site plan, layout plan and location map
- Land documents
- Water balance – sources, consumption and wastewater generated
- Details of air emissions (boilers, DG sets, process stacks)
- Details of pollution control equipment – ETP, STP, air pollution control devices
- Hazardous and solid waste generation and disposal plan
- CGWA NOC / groundwater permission, where groundwater is used
- Capital investment certificate (fees are based on project cost)
CTE is generally valid for 5 years and can be extended.
Step 3: Consent to Operate (CTO)
Once the plant and pollution control systems are installed, apply for CTO. The Board may inspect the unit and test the ETP/APCD before granting consent.
Under the CPCB guidelines, CTO can be granted for up to:
- Red: 5 years
- Orange: 10 years
- Green: 15 years
Actual validity depends on your state board and compliance record.
After CTO: staying compliant
- Run the ETP/STP and air pollution control devices at all times
- Get stack and effluent monitoring done as required
- File the annual environmental statement and hazardous-waste returns
- Install online monitoring where your category requires it
- Take fresh consent before expanding capacity, adding products or changing the process
- Apply for CTO renewal well before expiry
Common reasons for delay
- Wrong category selected in the application
- Incomplete water balance or mismatch between water NOC and consent application
- ETP/STP not designed for the actual effluent load
- Missing land or groundwater documents
- Not replying to the Board's queries on time
How ClearPath Compliance India can help
We have handled consent applications and board queries for food, beverage and packaged drinking water units first-hand. We identify your correct category, prepare the project details and water balance, file CTE and CTO on the state portal, reply to board queries, and track your renewal and annual return dates.
This article is for general information. Each State Pollution Control Board follows its own procedure, fee schedule and validity periods; please confirm the current position for your state before applying.