Question 1

What is the Household Water Exposure Score (HWES)?

Accepted Answer

The HWES is a composite score from 0 to 100 that summarises your tap water quality relative to UK and WHO safety limits. It is calculated from 9 indicators across 3 tiers, weighted by health significance, and developed with researchers at the University of Cambridge.

Question 2

How does the WaterGraph water test work?

Accepted Answer

Hugh, WaterGraph's co-founder, visits your home personally and tests your tap water across 9 indicators including lead, bacteria, and fluoride. You receive a full report, your water safety score, and personalised recommendations.

Question 3

How much does a WaterGraph water test cost?

Accepted Answer

A home water health test costs £29 and includes a 30-minute home visit by Hugh personally, a full report, and personalised recommendations. Ongoing monitoring is available for £24 per year, which includes score updates and an annual re-test.

Question 4

How do I know if there's been a sewage overflow near me?

Accepted Answer

The WaterGraph Map displays real-time sewage overflow data, river water quality, pollution incidents, and water company compliance records for any UK postcode. It's free to explore with no signup required. Subscribers also receive instant alerts when pollution events are reported within their chosen radius.

Question 5

Is my tap water safe in the New Forest?

Accepted Answer

Water companies test at the treatment works, not at your tap. Between the reservoir and your glass, water travels through miles of shared mains, local pipes, and your home's own plumbing. WaterGraph's £29 home test covers 9 indicators at your kitchen tap to give you a clear picture of what you're actually drinking.

Local water quality, mapped.