What to Do in a Legionella Outbreak – A Practical Guide for Duty Holders
This blog explains what duty holders should do during a suspected or confirmed legionella outbreak, including how to reduce the immediate risk, who must be…
Blogs
Legionnaires’ Disease Outbreak in London (2026)
In early 2026, an increase in cases of Legionnaires’ disease across London triggered a coordinated investigation led by the UK Health Security Agency, working alongside…
Landlords’ Guide: Best Practices for Legionella Control
This blog explains the key legionella control responsibilities landlords need to understand, including legal duties, risk assessments, safe water temperatures, flushing routines, appliance maintenance and…
HSG274: A Complete Guide to the HSE’s Legionella Technical Guidance
Last updated: May 2026 | Reviewed by H2O Comply If you are responsible for a building or its water systems, you have almost certainly come…
What is Total Viable Count (TVC) in Water Testing?
Updated 24/02/26 Total Viable Count (TVC) in water testing refers to the quantification of microorganisms present in a water sample, encompassing bacteria, yeast, or mold…
Water Tank Chlorination Explained in 5 Easy Steps
Updated 24/02/2026 Water tank chlorination is a crucial process for ensuring the safety and cleanliness of stored water. Whether for residential, commercial, or industrial use,…
What Is Biofilm and Why Is It a Serious Problem in Water Tanks?
This blog explains what biofilm is, how it forms inside water storage tanks and why it can become a serious risk to water quality, system…
Chlorination After Water Shortages
This blog explains why chlorination may be required after water shortages, burst pipes, pressure loss or prolonged supply interruptions. It covers how chlorination helps control…
Hot Water Tank Looking Dirty? It Could Be Quietly Damaging Your Heating System
When a Hot Water Tank Isn’t as Clean as It Should Be A hot water tank rarely gets much attention — until something goes wrong….
Water Testing Back in the Headlines – Why Independent Checks Matter More Than Ever
Water Quality Making the News Again Recent reports of residents in Tunbridge Wells being advised to boil their water have understandably caused concern. While these…
