New Official MOSL Performance Scores for Water Retailers

John Reynolds, CEO of Castle Water asks what this tells you, and what to look at if you are thinking of switching At the end
John Reynolds of Castle Water reviews impending tariff increases from 1 April, and looks at changes from 2027-30

Tariffs from the outside water tariff rises every April are still a postcode lottery. For the largest wholesale areas affecting Castle’s customers April price rises
Castle Water CEO John Reynolds gives a first view of tariff changes for April 2026

We have had first sight on indicative water tariff changes for 1 April 2026. There is no clear pattern. Changes vary from +3% to +30% for some customers. And the variation in movement between water and waste is still high – waste charges reduce by 5.4% for Southern with water charges increasing by 18.4%. The devil is very much in the detail for individual customers – bizarrely, United Utilities has a 22% increase for Places of Worship.
Have your say: Ofwat’s proposed water charge hikes for large business users

Castle Water CEO John Reynolds is seeking your input on Ofwat’s consultation that could raise water charges by up to 66% for high-usage business customers. Share your views by 23 September to help shape the industry response.
Look carefully before you switch your business water – mis-selling is rife

Castle Water customers can choose their water retailer. But, customers who switch from Castle to other water retailers are often very unhappy. If you buy
Castle Water CEO warns of additional late payment charges resulting from water industry financial problems.

With effect from 1 December an Exceptional Market Disruption Charge for late payment charges may be applicable. Please use paperless billing and opt for payment
Castle Water CEO John Reynolds calculates an early estimate of tariff changes in April 2025:

Preliminary estimate of +12% with significant variation between companies With the “Draft Determinations” now published by Ofwat, I wanted to give an initial guesstimate of
Castle Water CEO John Reynolds needs your input – Ofwat thinks you will be happy with providing financial support to Thames Water – do you agree?

Unless like me you are a bit of a regulatory geek, you have probably missed an important Ofwat consultation, on a water market codes change
Broker adds threats to mis-selling!

Even though my previous blog post (8 March) warning about misleading statements by brokers and Everflow was entirely factual, Love Energy Savings has demanded Castle Water remove this from our website and threatened legal action.
Ofwat Announces The 5 Business Water Retailers That Overcharged Some Customers

Ofwat recently published a letter on its website stating that 5 business water retailers have not been complying with the maximum price requirements and overcharged