Free tool
CTO expiry and renewal date calculator
Enter your Consent to Operate expiry date — or the grant date and category — and see exactly when to book lab sampling, when to apply, and how much runway you actually have. Runs entirely in your browser.
Your consent details
Everything is calculated in your browser. Nothing is sent anywhere, stored or logged.
or estimate it
Enter your consent expiry date — or the grant date and category — to see your renewal timeline.
How consent validity actually works
Consent validity in India is set by the CPCB categorisation of the unit — red, orange, green or white — which is itself derived from the pollution potential of the industrial activity. Red-category units, being the most polluting, receive the shortest consents and carry the heaviest monitoring load. Green-category units get the longest, which is exactly why green consents are the ones that quietly lapse: five years is remembered, fifteen is not.
| Category | Typical CTO validity | What it means in practice |
|---|---|---|
| Red | ~5 years | Highest pollution potential. Frequent renewals, intensive monitoring, closest scrutiny. |
| Orange | ~10 years | Moderate potential. Longer runway, but monitoring obligations continue throughout. |
| Green | ~15 years | Low potential. The long gap is the risk — nobody is watching a date fifteen years out. |
| White | Generally not required | Non-polluting. An intimation to the board is usually sufficient. |
These are the periods commonly granted, not a statutory guarantee. State boards vary and the validity stated on your own consent order always governs. Read more in CPCB pollution categories explained.
Questions about consent expiry
- How long is a Consent to Operate valid for?
- Validity is driven by the CPCB category of the unit. Red-category units commonly receive around five years, orange around ten and green around fifteen; white-category units generally do not require a Consent to Operate at all. These are the periods typically granted rather than a statutory guarantee — boards differ, and the period stated on your own consent order always governs.
- When should I start the renewal process?
- At least ninety days before expiry, and earlier if your consent covers many monitoring parameters. You need current lab reports from a NABL-accredited laboratory — commonly within three to six months — plus last year's Form-V filed and any open consent condition closed. Assembling that takes weeks, which is why the calculator works backwards from expiry rather than forwards from today.
- What happens if my CTO expires?
- Operating without a valid consent is an offence under the Water (Prevention and Control of Pollution) Act 1974 and the Air (Prevention and Control of Pollution) Act 1981. In practice the board can issue a show-cause notice or a closure direction, direct disconnection of power and water supply, and invoke the bank guarantee. Restoring a lapsed consent is materially slower than renewing one on time.
- Is my data stored when I use this calculator?
- No. The entire calculation runs in your browser. Nothing is transmitted, stored or logged — no dates, no categories, nothing. Compliance dates are commercially sensitive and you should not have to trust a website with them to do arithmetic.
- Does this work for CTE and Environmental Clearance too?
- The renewal-window logic is the same, but the validity periods are not — a Consent to Establish is tied to project implementation rather than a fixed category period, and an Environmental Clearance carries its own validity and a six-monthly compliance report obligation. Enter the expiry date from the document itself and the timeline will be correct for any of them.
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