Compliance
CPCB 2025 re-categorisation: what manufacturers must check
Most manufacturers treat their pollution category as a fixed fact, printed once on a consent and never revisited. In January 2025 the Central Pollution Control Board rewrote the method behind every category. For existing units, the window to fall in line closed in February 2026. A plant that has not renewed its consent since may still be operating on a classification the regulator no longer uses.
This is not a legal guide. It is an operator's account of what changed, why it matters to the people running a plant, and the short list of things to check this quarter.
What changed
CPCB issued its Classification of Sectors into Red, Orange, Green, White and Blue Categories in January 2025, and sent it to every State Pollution Control Board as directions under section 18(1)(b) of the Water Act, 1974, dated 12 February 2025. It replaced the 2016 classification.
The new document covers 419 sectors: 125 Red, 137 Orange, 94 Green, 54 White, and a new Blue category of nine essential environmental services. Each sector is placed by a Pollution Index score, and the bands moved:
| Category | Pollution Index, 2025 | Consent to operate, up to | Inspection |
|---|---|---|---|
| Red | 80 and above | 5 years | Every six months |
| Orange | 55 to under 80 | 10 years | Every year |
| Green | 25 to under 55 | 15 years | Every two years |
| White | Under 25 | — | — |
Under the 2016 document the Red threshold was 60. A sector's category is therefore not just a label; it decides how long a consent lasts, how often inspectors visit, and what the unit pays.
The deadline has already passed
The 2025 classification applies to existing units at their next consent renewal, or within one year of the directions, whichever comes first. The Maharashtra Pollution Control Board explains the change for its own units. One year from 12 February 2025 was 12 February 2026.
In practice, a plant whose consent was granted under the 2016 bands, and has not been renewed since, may now be operating on a category the Board would no longer assign. That cuts both ways. Some units move up and face shorter consents and more frequent inspection. Others move down and are paying for, and preparing for, a regime they no longer fall under.
Where classification gets uncertain
Not every activity has its own entry. There is, for example, no dedicated sector for PVC heat stabilisers or metallic stearates. For a plant making them, the category depends on which code the Board chooses to apply, and the spread is wide:
| Sector code applied | Pollution Index | Category |
|---|---|---|
| 18.1 Basic inorganic chemicals | 90.5 | Red |
| 111.1 Organic chemicals (solid or liquid fuel) | 93.6 | Red |
| 143.1 Synthetic resins | 82 | Red |
| 143.2 Synthetic resins, gaseous fuel only | 73 | Orange |
| 144 Blending and physical mixing of additives, without boiler | 51 | Green |
The same plant could reasonably be Red or Green depending on that one decision, with a threefold difference in consent life.
Some sectors moved categories outright. Foam manufacturing, for instance, was Orange with an index of 58 under the 2016 list and is Green at 44.8 under the 2025 one.
Two traps worth knowing
The boiler trap. A Green classification obtained on a "physical mixing only, without boiler" basis depends entirely on there being no boiler. The day a boiler or thermic-fluid heater is installed, the basis for the classification is gone, and the unit can move two categories at once. Plant engineering changes and consent status are rarely reviewed by the same person, which is exactly how this goes unnoticed.
The emissions lever. The scoring method assigns its maximum process-emission score, 35, to hazardous air pollutants, and names toluene di-isocyanate, methylene diphenyl di-isocyanate and lead among them. For plants handling isocyanates or lead compounds, whether the Board applied that score is often the deciding factor in the category.
What to check this quarter
- List every consent to establish and operate, by site and by legal entity, with its expiry date.
- Find which document each was granted under. If it predates February 2025, it was assessed on the 2016 bands.
- Get the classification memo for each, and note the sector code applied.
- Check whether the code still fits the plant. Has a boiler, a thermic-fluid heater, a fuel change or a new product line arrived since the consent was granted?
- Check the fees were recomputed for the 2025 category.
- Give the register one owner. Consents, authorisations and licences belong in a single compliance register with a named person accountable for every expiry date.
Why this is an operations problem
None of this is exotic. It is the same failure that sits underneath most operational surprises in growing companies: an obligation owned by nobody in particular, attached to a site or entity that has changed since it was granted, and remembered only when an inspector arrives. In multi-entity groups the problem compounds, because each consent is owed by a named occupier at a named site, and the operating structure has often outgrown the legal one.
The fix is unglamorous: one register, one owner, every expiry date visible, reviewed on a fixed cadence. If you want a quick read on where your own operating model is under strain, the free eight-minute Operations Health Check is a good place to start.
Last reviewed 25 October 2026, from the CPCB classification document and the section 18(1)(b) directions of 12 February 2025. Check the current text with your State Board or counsel before acting on a specific consent.