PUBLIC DATA / 18 DISTRICT COUNCIL DISTRICTS
Your district data,
made clear.
Choose a district to view the Water Supplies Department’s published 2025 monitoring statistics. They are useful public context—not a test of your flat, building, tap or shower.
CENTRAL AND WESTERN / 2025 MONITORING PERIOD
Published maxima, in context.
RESIDUAL CHLORINE
1.2
published maximum / mg/L
HKDWS standard: ≤5 mg/L
LEAD
<1
published maximum / µg/L
HKDWS standard: ≤10 µg/L
COPPER
110
published maximum / µg/L
HKDWS standard: ≤2000 µg/L
NICKEL
3
published maximum / µg/L
HKDWS standard: ≤70 µg/L
HOW TO READ THE CHART
One bar is not a home reading.
Each black bar shows the published maximum from randomly selected consumers’ premises in the district during 1/1/2025 to 31/12/2025. The scale compares that published maximum with the relevant Hong Kong Drinking Water Standard.
It does not describe every building, flat or shower. Local plumbing, fittings and a shower connection are part of the final route that this report cannot test.
| PARAMETER | SAMPLES | PUBLISHED RANGE | AVERAGE |
|---|---|---|---|
| Residual chlorine | 22 | 0.3–1.2 mg/L | 0.8 mg/L |
| Lead | 22 | <1–<1 µg/L | <1 µg/L |
| Copper | 22 | 5–110 µg/L | 34 µg/L |
| Nickel | 22 | <1–3 µg/L | 2 µg/L |
Official programme boundary. WSD’s Enhanced Water Quality Monitoring Programme samples randomly selected premises and applies a two-tier protocol for metals. A published Tier 1 maximum above a standard is not, on its own, a finding of non-compliance; WSD assesses the associated Tier 2 sample where required. Read the district PDF for the exact method and explanatory notes.
THE FINAL WATER PATH
District figures are the beginning.
Before water reaches your shower, it travels through a specific building’s plumbing, fittings, shower connection and spray plate. Pureis Phase 1 is designed for that final water path, with two internal cartridges and one Complete Filter Set replacement rhythm.
Source: Water Supplies Department, Enhanced Water Quality Monitoring Programme, annual district statistics for 1 January 2025–31 December 2025.