New Sprinkler and Wet Riser Tank Size Calculator

Our Solutions

Dewey Waters is a global market leader in the manufacture and installation of large and small scale tanks, housing & biofilters distributing throughout the United Kingdom and worldwide.

Water Tanks

Dewey Waters is a market leader in the manufacture and supply of GRP cold water storage tanks for the UK and export markets. With over 60 years experience in the water tank industry, we have gained an excellent reputation in the  manufacture and installation of large and small scale water tanks for our customers at home and abroad. LEARN MORE >

Importing/ Export Tanks

Dewey Waters is reputed for being one of the leading international exporters of water tanks, housing/kiosks, and other GRP products. Our technical expertise, innovative manufacturing methods and extensive product range put us at the forefront of international water tank exporters. LEARN MORE >

Housings & Biofilters

The Altos GRP modular housing, commonly used as an external plant room, is available in a range of colours from the RAL and BS5252 colour chart. GRP Biofilter housings, typically used for odour control, are suitable for the storage of various types of media and are available in metric and imperial panel sizes. LEARN MORE >

Export Distributors Wanted

for GRP water storage tanks

At Dewey Waters, a large part of our success has come through working with a select number of partners, developing strategic and mutually beneficial relationships. Dewey Waters are committed to maintaining a close, healthy and productive relationship with all of our partners and always strive to provide maximum value for all involved parties.



 Manufacturing & installing GRP tanks for over 60 Years

Dewey Waters is one of the UK’s market leaders in the manufacture and supply of all cold water storage tanks. We specialise in sectional (1,000 to 1,500,000 litres) and one piece tanks (30 to 12,000 litres) offering both standard or custom built tanks to suit all water storage project requirements. We also provide a range of other GRP manufactured products including housings and biofilters, as well as kiosks and cabinets. We have the ability to fully manage turnkey refurbishment projects of all sizes.


We endeavour to provide you with an excellent customer experience through all stages of your project.

Technical Advice

We provide high levels of technical knowledge, product choice and after sale customer service.

Fully Certified

Dewey Waters is a WRAS & LPCB accredited & certified GRP water tank manufacturer. 

Expert Installation

Over 60 years’ industry experience in both Water Storage and GRP industries. 



We offer a water tank calculator tool that will assist you in finding out the exact tank size and capacity required for your job.


60 years' industry experience, trusted & reputable supplier