Find your local supply results
In Switzerland, your water supplier provides information about water quality at your address. Check its results or contact it directly. OSAV explains the drinking water monitoring framework in Switzerland.
Check the network or distribution unit named in the document. One municipality may be served by several networks. The sampling and summary dates help put the information in context.
Understand what was tested
Health monitoring combines surveillance by the water provider with checks by regional health agencies. It covers the journey from abstraction to the consumer's tap, with sampling at facilities and across the network.
Each report lists the parameters analysed for a sample. Read the results with their units, stated reference values and the health authority's conclusion. A result applies to the substances actually tested.
Three pointers for reading the figures
The parameters describe different aspects of water.
Hardness
This indicates calcium and magnesium content. The Limescale guide explains its unit and relevance to home maintenance.
The value and its unit
Keep the parameter name with its concentration and unit. Comparisons need results expressed on the same basis.
The monitoring conclusion
This places the results in the context of health monitoring. For drinking advice, refer to current information from your supplier and the health authority.
Define a follow-up question
Want to understand a change in taste or check a parameter in your home? Note what you observed, the tap concerned and the date. First ask your water service for the available information.
Further analysis then starts with a specific question, a list of parameters and a sampling protocol. The Water Analysis page explains how to define this process.
Access to water worldwide
The WHO/UNICEF Joint Monitoring Programme assesses access to drinking water worldwide. A safely managed service relies, among other things, on an improved source accessible at home, available when needed and free from contamination.
UNICEF's drinking water publication shows differences in access between countries and populations. It sheds light on an essential service worldwide. For your home, local supply information remains the starting point.
Sources for further reading
OSAV explains drinking water quality monitoring in Switzerland. Your supplier provides information about local results.
OSAV explains drinking water quality monitoring in Switzerland. Your supplier provides information about local results.
UNICEF Data: Drinking water, data and methodology from the WHO/UNICEF Joint Monitoring Programme. Sources accessed 7 September 2026.