For a Hamburg address, start with the waterworks that supplies it, then compare the same parameter in the same units. HAMBURG WASSER's postcode lookup may ask for a street and district when more than one works is possible. A number taken from another district can describe a different supply. Find your Hamburg waterworks.
If you are setting up a dishwasher in a rental, keep the utility result beside the appliance instructions. For a mineral comparison, keep the original analysis instead. Those jobs call for different rows of the report, even though both start with a glass of water.
Read the parameter before the number
In the Bergedorf online analysis, total hardness is shown in °dH, while calcium and magnesium have separate rows in mg/L. The glossary describes hardness in terms of calcium and magnesium and defines mmol/L as an amount of substance per litre. The table also uses mmol/L for acid capacity. Read the Bergedorf table and unit definitions.
The practical consequence is that a shared unit does not make two rows interchangeable. Acid capacity and total hardness have different labels. A calcium concentration alone also leaves out the magnesium contribution to hardness. Before comparing figures, copy the parameter name as carefully as the number. A note that only says "minerals: 56" loses the information needed to interpret it.
Keep the reporting year attached
The downloadable Bergedorf PDF is headed 2025 drinking-water analysis values. It reports mean total hardness of 9.33 °dH, with a minimum of 8.8 and maximum of 9.6. Mean calcium is 56 mg/L and mean magnesium is 7 mg/L. Bergedorf's 2025 analysis.
These are works-level figures in an annual table, not a measurement from your kitchen. In particular, the mean and maximum are different statistics. If you copy the mean from one report and the maximum from another, label both; otherwise the comparison can exaggerate a difference that comes from the column choice.
The online table displays an analysis status date of 29 January 2026. That date and the PDF's 2025 heading identify different parts of the record. We have not established the exact collection dates behind the online quarterly column or a publication date for the PDF. Neither record gives a fresh October measurement at an individual address. Check the online date label.
Convert a unit without changing the evidence
Stadtwerke Bühl's utility reference gives 1 °dH as 0.1783 mmol/L and 1 mmol/L as 5.6 °dH for hardness. This is a conversion reference, not Hamburg sampling evidence. Use it only when both figures describe hardness; it is not a shortcut from any mg/L row to total hardness. The utility's hardness conversion table.
When converting a published result, retain the original beside the converted value and identify the conversion as arithmetic. Keep the reporting period and works name. Extra decimal places from a calculator do not turn the underlying report into a more precise measurement.
Use the figure for the question you have
HAMBURG WASSER describes soft water as below 8.4 °dH, medium as 8.4 to 14 °dH, and hard as above 14 °dH. It says hardness can vary between districts and directs customers to their relevant works analysis. Hamburg's hardness guidance.
For an appliance setting, compare the matched hardness figure with the manufacturer's stated units and instructions. For calcium intake, use the calcium row and its reporting context; a hardness category does not provide that concentration. Water quality questions require the relevant quality information as well. Our TDS meter explainer covers another aggregate reading, and the Hamburg city guide gives broader travel context.
