Free tool · Bengaluru
BWSSB rainwater-harvesting penalty calculator
Check whether the BWSSB mandate applies to your Bangalore property — and exactly what it costs to stay non-compliant. Enter your water bill and building size below.
Your property is covered by the BWSSB rainwater-harvesting mandate.
RWH is legally required. Without it, BWSSB can levy the penalties below until you install and self-declare a system.
- Monthly surcharge
- ₹600
- Annual surcharge
- ₹7,200
- One-time fine
- ₹5,000
First-year cost of not complying: ₹12,200 — a one-time RWH system typically costs less and ends the surcharge for good.
Who has to install rainwater harvesting?
The BWSSB / BBMP mandate (2009) makes RWH compulsory for:
- •Any building on a site of 2,400 sq ft and above (existing buildings)
- •Buildings constructed after 2009 on sites of 1,200 sq ft and above
Non-compliance carries a 50% water-bill surcharge plus a one-time fine of ₹5,000. Rules current as of 2026-05-12. View the BWSSB rules.
What the surcharge costs, by water bill
For a covered property that hasn't installed RWH:
| Monthly water bill | Monthly surcharge | Annual surcharge | First-year cost* |
|---|---|---|---|
| ₹500 | ₹250 | ₹3,000 | ₹8,000 |
| ₹1,000 | ₹500 | ₹6,000 | ₹11,000 |
| ₹2,000 | ₹1,000 | ₹12,000 | ₹17,000 |
| ₹5,000 | ₹2,500 | ₹30,000 | ₹35,000 |
*First-year cost includes the ₹5,000 one-time fine. The surcharge continues every month until you install a system.
End the surcharge — install RWH
A one-time rainwater-harvesting system stops the surcharge for good, cuts your water bill, and secures supply in shortages. See a size-based cost estimate for your roof.
Bangalore RWH mandate — frequently asked
Is rainwater harvesting mandatory in Bangalore?
Yes. Under the BWSSB mandate (2009), rainwater harvesting is required for buildings on sites of 2,400 sq ft and above, and for buildings constructed after 2009 on sites of 1,200 sq ft and above.
What is the penalty for not having rainwater harvesting in Bangalore?
BWSSB levies a 50% surcharge on your monthly water bill until you install a compliant system, plus a one-time fine of ₹5,000 for non-compliance.
Does the surcharge stop once I install RWH?
Yes. Once you install a system and submit the self-declaration to your BWSSB sub-division office, the surcharge is removed on your next billing cycle.
How much does a rainwater-harvesting system cost in Bangalore?
For a typical independent home it is usually a one-time cost that is recovered quickly against the avoided surcharge and tanker savings. Run the RWH calculator for a size-based estimate for your roof.
How do I become compliant with the BWSSB mandate?
Install RWH system via a BWSSB-trained plumber; Submit self-declaration form to local BWSSB sub-division office; Attach photographs of installed system; Retain a copy of approval for renewal cycles.