21/08/2026
What is an RPZ Valve, and why is Thames Water so strict about testing it? π οΈ
If your commercial property uses chemical dosing, commercial boilers, or booster systems, you likely have an RPZ (Reduced Pressure Zone) valve installed. It prevents potentially contaminated water from flowing backward into London's drinking water supply.
3 Things Every London Building Manager Needs to Know:
1οΈβ£ Annual testing is a mandatory legal requirement.
2οΈβ£ Tests MUST be carried out by a certified tester using approved differential gauges.
3οΈβ£ Detailed test records must be kept on file for audits.
π Covering Greater London & Thames Water jurisdictions.
π Tap the link in our bio to read our full Thames Water RPZ Compliance Guide!