If you own property in Bangalore, there's a good chance you're legally required to have a rainwater harvesting system — and there's an equally good chance you don't have one yet. BWSSB has been ramping up enforcement, issuing notices, and even disconnecting water supply for non-compliant properties.
This guide covers everything you need to know about Bangalore's mandatory RWH rules.
Who Needs Rainwater Harvesting in Bangalore?
BWSSB mandates RWH for two categories of properties:
New construction (post-2009): All buildings on sites of 1,200 sq ft (30×40) and above must install RWH before getting the building completion certificate.
Existing buildings (pre-2009): Properties on sites of 2,400 sq ft (40×60) and above must retrofit RWH systems.
This covers independent houses, villas, apartment complexes, commercial buildings, and institutional properties.
What Are the Penalties?
Non-compliance attracts a fine of ₹5,000 (which can be levied monthly), potential disconnection of BWSSB water supply, denial of building plan approvals, and denial of property mutation and transfer.
BWSSB has been increasingly strict in recent years, conducting door-to-door surveys and issuing notices across Bangalore's growth corridors.
Types of RWH Systems for Bangalore
1. Rooftop Collection + Recharge Pit
The most basic and affordable system. Rainwater from your roof is channeled through gutters and downpipes into a recharge pit that allows water to percolate into the ground. Cost: ₹15,000–₹25,000 for a 30×40 site.
2. Rooftop Collection + Storage Tank
Rainwater is filtered and stored in above-ground or underground tanks for domestic use. Best for properties that want to reduce tanker dependency. Cost: ₹35,000–₹60,000 for a 40×60 site.
3. Advanced System + Borewell Recharge
For large properties and apartments, rainwater is filtered and directed into existing borewells through injection wells. This recharges the groundwater table and can revive dried-up borewells. Cost: ₹60,000–₹1,50,000 for villas and large plots.
How Much Water Can You Harvest?
In Bangalore, with ~970mm average rainfall, a 1,000 sq ft roof area can harvest approximately 60,000 litres of water per year. For a 2,400 sq ft plot with 1,500 sq ft roof coverage, that's about 90,000 litres — enough to meet a family's non-drinking water needs for 3-4 months.
The Installation Process
- Day 1: Site survey and system design based on your roof area, soil type, and water usage
- Day 2-3: Gutter and downpipe installation, first-flush diverter setup
- Day 3-4: Recharge pit / storage tank / filtration unit installation
- Day 4-5: Plumbing connections, testing, and commissioning
- Post-installation: BWSSB compliance documentation and certification
How to Get the BWSSB Compliance Certificate
After installation, you need to submit photographs and details of your RWH system to the BWSSB subdivision office for your area. They may conduct an inspection. Once approved, you receive a compliance certificate that keeps you safe from penalties. We handle this entire documentation process for our customers.
Ready to Get Compliant?
Don't wait for the BWSSB notice. Get your RWH system installed now and avoid fines, water disconnection, and property transfer issues. Call or WhatsApp LoklFix for a free site assessment.