How can I prepare for a disruption to the water supply?
Disruptions to the drinking water supply are rare, but they can occur. In the event of a large-scale crisis, emergency and response teams cannot assist all businesses, facilities, or residents at the same time. Therefore, it is advisable to take your own precautions. On the Emergency Preparedness page, you can learn how to prepare for an evacuation or other emergencies.
Where does Wiesbaden's drinking water come from?
Wiesbaden is supplied with drinking water from various sources, including the Hessian Ried, the Wiesbaden Taunus tunnels and the Schierstein waterworks.
The water from the waterworks' wells and the Taunus tunnels is processed into drinking water in five waterworks. Together with the water from the Hessian Ried and Niedernhausen, it is pumped into various water tanks and from there enters the supply network. Mixing of the water can occur in the network.
How is the water network in Wiesbaden structured?
The drinking water network consists of 26 water tanks, around 740 kilometers of supply pipes and over 34,000 house connections. It is divided into 24 pressure zones. Some zones are not physically connected to other zones. This is particularly the case in the eastern suburbs such as Naurod. Nevertheless, the area supplied by the water supply companies of the state capital of Wiesbaden (WLW) is legally considered to be one supply area.
The districts of Amöneburg, Kastel and Kostheim are not supplied by WLW, but by Mainzer Netze GmbH. They are a separate water supply area.
Which companies are responsible for drinking water in Wiesbaden?
WLW is a company owned by the city of Wiesbaden. Theyprocure water and connect properties to the water network. The necessary pipes and other components of the water network belong to ESWE Versorgung. Both companies work closely together. WLW has leased pipes and other components of the water network from ESWE Versorgung. The water itself comes from Hessenwasser. The company is majority-owned by municipalities and supplies water to numerous cities, municipalities and distributors in the Rhine-Main region, including Wiesbaden.
In Wiesbaden, as in the whole of Germany, drinking water is subject to the strictest controls. The quality requirements are defined by laws, guidelines and regulations. To ensure that there are no undesirable substances in the drinking water, drinking water samples are regularly taken from the distribution network.
There are currently seventy sampling points in Wiesbaden's distribution network. Around 530 routine checks were carried out in 2024. The public health department determines how often samples are routinely taken at individual sampling points, for example monthly, bi-monthly, quarterly or annually.
In special situations, certain sampling points are sampled more frequently. In addition, there are regular inspections of extraction, treatment and distribution facilities such as water tanks and waterworks. In total,well over a thousand drinking water samples are taken in Wiesbadenevery year, which undergo various analytical tests.
What is drinking water tested for?
Drinking water is generally not sterile. It is tested for a variety of microbiological, chemical and physical parameters to ensure that it is safe for human health. These include tests for faecal bacteria such as E. coli and enterococci, heavy metals such as lead and copper, as well as agricultural contaminants such as nitrate and pesticides.
There is no general answer to this question. Some parameters are determineddirectly when samples are taken on site, for example the pH value of the water. Other parameters must be analyzed in the laboratory. Once a sample has been received by the laboratory, the analysis usually begins on the same day. Results of microbiological tests are available after 24 to 48 hours, depending on the method and parameters. Organic or inorganic tests can take several days to weeks.
Background to a boiling ban
What is a boil-off order?
A boiling requirement is a recommendation to boildrinking water once (up to around 100 degrees Celsius) and then leave it to cool for around ten minutes before using it. This kills germs. You can then use the water as usual. Alternatively, you can also use packaged drinking water from the supermarket if boiling is required.
Who issues a boiling order?
The health department of the state capital of Wiesbaden issues a boiling order if there is a possibility that drinking water has been contaminated or a specific contamination has been detected. At the same time, the purposes for which the water must be boiled are specified.
When do I need to boil water?
There is no one-size-fits-all answer to this question. The answer depends on the specific situation. If a boil-water order is issued, you can find the latest information at wiesbaden.de/krisenfall.
How do I find out when a boiling order is issued?
As soon as a boil-water order is issued, the city will immediately inform the public—including through press releases, on wiesbaden.de/krisenfall, and via social media platforms such as Facebook, Instagram, and WhatsApp. Please also pay attention to reports in local print and online media, as well as on the radio and television. Depending on the situation, information may also be provided via alert apps.
How do I find out when a boiling ban is lifted?
The boil-water advisory for the affected areas remains in effect until further notice from the Public Health Department of the State Capital of Wiesbaden. For the advisory to be lifted, several consecutive drinking water samples must test safe.
As soon as the boil-water advisory is lifted, the city will immediately inform the public—including via press release, on wiesbaden.de/krisenfall, and through social media platforms such as Facebook, Instagram, and WhatsApp. Please also pay attention to reports in local print and online media, on the radio, and on television. If the alert was issued via warning apps, the all-clear will also be issued through those apps.
