16th, May, 2025

Rainwater Harvesting at Home: Setup, Costs, and Government Subsidies

What is a Rainwater Harvesting?

Rainwater harvesting is the process of collecting and storing rainwater for later use. It is one of the best and eco-friendly ways to save water, especially in areas where water shortage is common. You can collect rainwater from rooftops, terraces, or open spaces and store it in tanks or underground reservoirs.

Why is Rainwater Harvesting Important?

• Saves water and reduces dependency on groundwater

• Helps recharge groundwater levels

• Reduces water bills at home

• A great solution for water shortage in summer

• Good for gardening, cleaning, and even drinking (after filtration)

• Eco-friendly and sustainable

Rainwater Harvesting Setup at Home

There are two common types of rainwater harvesting systems for homes:

1. Rooftop Rainwater Harvesting

This is the most popular and easy-to-install system for houses.

Steps to set up:

• Catchment Area: Your rooftop or terrace

• Gutters and Pipes: To collect and channel rainwater

• First Flush System: Removes the first dirty flow of rainwater

• Filter Unit: Removes dirt and debris

• Storage Tank: Stores filtered water

• Recharge Pit or Borewell Connection (optional): Sends water underground

2. Surface Runoff Harvesting

• Useful if you have open areas or gardens

• Water is collected from ground surfaces and directed to storage or recharge pits

Rainwater Harvesting System Cost in India

Rainwater harvesting cost depends on the size of the house and system type:

Pro Tip: The cost includes materials like pipes, filters, tanks, and plumber installation charges.

What Equipment is Required?

Here are the common rainwater harvesting components:

• PVC/GI Pipes for channeling rainwater

• Mesh to avoid leaves/debris

• First flush system

• Filters (sand, charcoal, gravel)

• Storage tanks (plastic or cement)

• Recharge pits or soak pits

Benefits of Rainwater Harvesting at Home

• Saves thousands of liters of water every year

• Lowers your water bill

• Helps prevent waterlogging and soil erosion

• Improves groundwater quality

• Easy to maintain and long-lasting system

• Can be done even in small homes or flats

Government Subsidy for Rainwater Harvesting in India

Yes, the government offers subsidy for rainwater harvesting systems to promote water conservation.

Some state-wise rainwater harvesting subsidies:

• Delhi: Up to 50% subsidy for installing rainwater harvesting system

• Tamil Nadu: Mandatory for new buildings and provides grants

• Maharashtra: Subsidy under Jalswarajya scheme

• Karnataka: BBMP offers subsidy of ₹25,000–₹50,000

• Haryana & Punjab: Incentives for rooftop rainwater harvesting

How to Apply for Subsidy?

• Contact local municipal office or water department

• Submit application with building details

• Get system installed and inspected

• Claim subsidy post-verification

Tip: Keep all receipts and installation photos for subsidy application.

DIY Rainwater Harvesting or Hire a Professional?

• DIY is possible for small homes with basic plumbing knowledge

• For complex systems or filtration, it's better to hire an expert

• You can consult rainwater harvesting consultants or local plumbers

How Much Water Can You Save?

A 1000 sq. ft. rooftop can collect around 60,000 liters of water per year (with average rainfall). This is enough for:

• Gardening

• Washing vehicles

• Flushing toilets

• Cleaning floors

• And even drinking after filtering

Common FAQs

1. Is rainwater harvesting compulsory?

In some cities like Chennai and Delhi, it is mandatory for new buildings.

2. Can rainwater be used for drinking?

Yes, after proper filtration and purification.

3. How often do I clean the system?

Clean gutters and filters before and after every rainy season.

Final Thoughts

Installing a rainwater harvesting system at home is a smart, eco-friendly, and cost-effective solution. Whether you live in a city or village, it's a step toward saving water and reducing your monthly water bill. With government support and available subsidies, it’s now easier than ever to start rainwater harvesting.