Rainwater Harvesting

Rainwater Harvesting Systems

Put rainwater to use for garden watering, toilet flushing and washing machines with a system designed around your property.

We install and maintain rainwater harvesting systems for homes and commercial properties across Essex, Cambridgeshire, Hertfordshire and surrounding areas. As installers and service engineers, we provide practical product advice, professional installation and ongoing maintenance support.

System selection, installation, and servicing from an experienced drainage team.

What is rainwater harvesting?

Rainwater harvesting collects rainfall, usually from a roof, filters it, and stores it for later use. The systems described here supply water for suitable non-drinking uses, such as garden watering, toilet flushing and washing machines.

Types of Rainwater Harvesting Systems at Groundsource Drainage

Whether you need a rainwater harvester for garden use or a system supplying indoor appliances, the equipment should suit the building and the amount of water you expect to use.

We plan the harvesting of rainwater around your roof collection area, available storage space and intended use. Tank capacity, filtration and the way water reaches the connected outlets are considered together, helping us recommend a suitable arrangement.

Our Rainwater Harvesting System Options

Direct-Pumped Systems

Water is pumped directly from the storage tank to connected appliances or outlets. These systems can supply toilets, washing machines, and garden watering points, depending on the installation.

Indirect Gravity Systems

Rainwater is pumped to a high-level header tank, then supplied to connected outlets by gravity. This option requires suitable space and sufficient height for the header tank.

Indirect Pumped Systems

Water passes from the main storage tank to a secondary tank, then a booster pump supplies the connected outlets. This arrangement allows the supply pressure to be matched to the building’s requirements.

Integrated Systems

Rainwater harvesting can be planned alongside other water-management measures. We discuss the wider project requirements to establish how collection, storage and reuse should fit into the proposed arrangement.

Underground and Above-Ground Tanks

We offer both underground and above-ground storage options. The appropriate tank depends on available space, access, collection capacity, and how the system will be used and maintained.

Rain Water Harvesting for Homes and Commercial Properties

Domestic Rainwater Harvesting

For homeowners, a system can provide collected rainwater for watering plants, flushing toilets, and supplying washing machines where suitable plumbing is installed.

We help you choose between a garden-focused system and an installation serving selected household appliances. The proposed uses determine the storage, filtration and distribution equipment required.

Commercial and Building Projects

We also work with commercial customers, builders and groundworkers requiring rainwater harvesting as part of a wider project.

Our team can advise on system selection and installation requirements so the tank, pipework and supply arrangement can be considered alongside the building and groundworks.

Get A Quote

Get a no obligation quote tailored to your specific needs. Fill out contact form now, and one of our drainage specialists will be in touch with you shortly.

Rainwater Harvesting Systems FAQs

Can a system be installed at an existing property?

It may be possible, depending on access, storage space and the existing drainage and plumbing layout. Garden-only systems and installations supplying indoor appliances have different requirements. We can discuss which approach is practical for your property.

How much does a rainwater harvesting system cost?

The cost depends on tank size, system type, filtration, access, groundwork and the connections required. Contact us with your property details and intended uses so we can advise on a suitable system and provide a quotation.

What happens when stored rainwater runs low?

Some systems include a mains-water backup to maintain supply when rainfall is insufficient. This requires an arrangement that protects the drinking-water supply from contamination. Backup options should be discussed when choosing the system.

Request a Rainwater Harvesting Quote

Tell us your property postcode, whether the project is residential or commercial, and how you would like to use the collected water. For servicing enquiries, include any details you have about the existing tank and equipment.

Expert suppliers of Rainwater Harvesting Systems in the UK

Groundsource Drainage, renowned for its expert drainage services in Essex, Cambs, Hertfordshire, and surrounding areas, now extends its expertise to specialised rainwater harvesting systems. Our seasoned team excels in the installation, maintenance, and repair of these systems for a range of properties. We are dedicated to providing comprehensive solutions that cater to both business and domestic customers.

Our commitment to excellence is evident in every project we undertake. From the initial consultation to the final installation, our team ensures that every aspect of your rainwater harvesting system, including water butts and water tanks, is handled with the utmost professionalism and expertise.

In addition to our standard services, we offer an emergency call-out service. Our specialists provide competitive rates and an outstanding service, ensuring that your system is always functioning at its best.

Nicholas Parsons

21 June 2026

Dean and his team delivered an important job for us on time and with the minimum of disruption. They were excellent communicators, keeping us up to speed with progress and issues and keen to see everything done to our satisfaction. Our complex problem was resolved in the most appropriate and least expensive way, for which we are very grateful to them all.

Rachel McDonald

19 June 2026

We had a major issue with our drain, that was causing major issues. Dean and the team were great, not only going above & beyond, but also being honest, reliable & made sure to get the job done to perfection. Would highly recommend.

Rebecca Noyes

19 May 2026

Dean and the team were excellent from start to finish. They recently installed a new pump station and water treatment plant for us after our previous system collapsed, and I genuinely couldn’t recommend them highly enough. They quickly found a pragmatic and cost-effective solution to what was quite a complex problem, making sensible use of the existing drainage wherever possible to help keep costs under control. As is often the case with projects like this, additional complications arose once work began, but at every stage they approached things calmly and professionally, always finding solutions that were practical, proportionate, and clearly well thought through. They were also a pleasure to have on site - considerate of the wider garden and driveway, exceptionally polite, and clearly very knowledgeable without ever taking advantage of the scale of the project. Communication, follow-up, and aftercare have all been excellent too. A trustworthy, dependable, and highly professional team that I would not hesitate to recommend.

Tanya Porter

8 April 2026

Recommended from another drainage company who couldn't carry out the work. Was given great price. Work was carried out to great standard in good timescale. Very happy so would definitely recommend

Chloe Adamson

31 March 2026

We have just had a septic removed and a new sewage treatment installed and drainage on our house Dean and Adam were really good and friendly with the neighbours . We would use them again and recommend them to others

lacie nelson

6 February 2026

we were selling our house and found that our septic tank needed upgrading to a sewage treatment tank or we couldn’t sell . In a panic we called Groundsource and Dean was really helpful and calmed us down. Dean and Arren came and got the job done with little fuss and informed us about the job all th way through . The sale is now back on and i can’t thank Dean enough, i would highly recommend and will use them again if ever needed.

Mark Powell

3 February 2026

I can highly recommend Ground Source Drainage as they really do know their stuff. I was getting fed up of conmen coming round and telling me about injecting my 200 year old solid walls when I knew this wouldn’t work! Dean from Ground Source Drainage took one look and instantly said “you need a French drain or an ACO system, but the French drain would look more in keeping” this was music to my ears because I was already pretty sure that a French drain would solve the problem permanently as two other people with older buildings had already suggested the idea. Dean and Neil were very professional, worked extremely fast and always made sure that they cleaned up as they worked, and Dean was 100% right the finished job looks absolutely fantastic!

Calum Leader

28 January 2026

Over the moon with the service from ground source, we had a failed septic tank, dean and ground source come out and was absolutely amazing, put in a new upgraded tank for us, everything from dealing with the team over the phone to the completed job was 100 % all the way through, brilliant company and would definitely recommend.

Daniel Codd

15 January 2026

Fantastic service Dean went above and beyond, would not hesitate to recommend them, a very professional service. Billy codd

John Stanyon

29 October 2025

Dean recently installed a sewage treatment plant at my house. The job wasn’t without it’s problems but having turned up when they said they would the job was completed on time and on budget by a really helpful, friendly team who restored the site to a very high standard. Anyone wanting a similar job done, go to Ground Source Drainage for excellent results.