MPCB, CPCB and SPCB filings: the applications, returns and renewals the boards actually want.

The Central Pollution Control Board sets standards, coordinates state boards and issues national directions; the State Pollution Control Board is the authority that actually grants consents and authorisations and receives returns for units in its state. For a normal operating site, essentially every permission and every return goes to the SPCB, MPCB in Maharashtra. CPCB is where you go for national producer-responsibility registrations, not for your consent.

Consent to Establish is obtained before construction and is the board's permission to set up the unit as described. Consent to Operate is obtained before commencing operation and carries the conditions the unit will be regulated against: discharge standards, emission limits, waste quantities, monitoring. The CTE is a one-time gate; the CTO is renewed through the life of the unit.

The category, assigned on the CPCB classification by pollution potential, determines the consent validity period a board will grant, the level of scrutiny, siting restrictions and in some states the fee. White category units, the least polluting, are generally exempt from Consent to Operate and require only intimation. The category is decided by the industry type, so it is not negotiable, but it is worth confirming, since mis-categorisation changes the whole compliance load.

Extended producer responsibility registrations and returns (plastic packaging, e-waste, batteries and waste tyres) are handled centrally on CPCB portals by producers, importers and brand owners, with returns filed on those portals. This is the main class of obligation that bypasses the state board, and it is regularly missed by units that assume all environmental filing is an SPCB matter.

It depends on the board, the category and above all on the completeness of the application. Boards work to their own service timelines, but the practical determinant is the query cycle, an application that draws two rounds of queries takes far longer than one filed complete. Renewals should be initiated months ahead of expiry so the unit is never operating on a lapsed consent.

Yes. A consent can be amended for changes in product mix, capacity, effluent quantity or process, and it can be transferred on a change of ownership, so the permission follows the unit. Both are applications to the board with supporting justification. Operating outside the parameters written into a consent, without amending it, is itself a breach of the consent.

Online continuous emission and effluent monitoring systems transmit stack and effluent data directly to CPCB and state board servers. CPCB directions require it for the highly polluting industry categories and for certain other units, and consent conditions commonly impose it. Where it applies, uptime and calibration become compliance obligations in their own right. A system installed but offline is treated as a lapse.