How hard is the water in Postcode 91074?

Herzo Werke GmbH publishes the hardness range hart for the supply zone Hochzone. The hardness range is a classification under the German Detergents and Cleaning Products Act (soft below 8,4 °dH, medium 8,4 to 14 °dH, hard above that) and not a quality verdict — it indicates how much calcium and magnesium is dissolved in the water. Basis: Publication by the water supplier, retrieved on 11/07/2026.

Who supplies the drinking water in Postcode 91074?

Herzo Werke GmbH. The values shown here come from the supply zone Hochzone and apply to the water the supplier delivers. What happens between the building connection and the tap — in old lead pipes, for example — is not covered by these analyses; information on that is provided by owners, the health authority or an examination by an accredited laboratory.

Drinking water in 91074

For this postcode Herzo Werke GmbH publishes several supply zones. Which of them serves an individual address is not published — below are the values of the zone with the most documented parameters, the remaining 1 underneath.

How to read the share of the parametric value

12 % Share of the parametric value. The proportion of the permitted maximum that the measured value uses — here 12 %, so just over an eighth.

< 10 % * Below the limit of quantification. The substance was not detectable. The mark shows where the detection limit lies relative to the parametric value — the actual share of the parametric value is below that.

Several samples per year: for chemical parameters the mean value is given, for microbiological ones the highest measured value. There the parametric value is zero — a single finding would disappear in the average, and it is precisely that finding which is the information. Which reference applies is stated in the last column of the table.

Hochzone

Herzo Werke GmbH

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness

3,62

Hardness range hart

Key values Hochzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	33 mg/Liter	50 mg/l	—	Single value · Hochzone
Lead	<0,003 mg/Liter below limit of quantification	10 µg/l	—	Single value · Hochzone
Sulphate	67 mg/Liter	250 mg/l	—	Single value · Hochzone
Sodium	28,0 mg/Liter	200 mg/l	—	Single value · Hochzone

Show all recorded parameters (32 — most recent value per parameter)

Chemical parameters (15)

Chemical parameters – Hochzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Antimony	<0,001 mg/Liter below limit of quantification	5 µg/l	—	Single value · Hochzone
Arsenic	0,004 mg/Liter	10 µg/l	—	Single value · Hochzone
Cadmium	<0,0009 mg/Liter below limit of quantification	3 µg/l	—	Single value · Hochzone
Chromium	<0,0005 mg/Liter below limit of quantification	25 µg/l	—	Single value · Hochzone
Copper	<0,05 mg/Liter below limit of quantification	2 mg/l	—	Single value · Hochzone
Cyanide	<0,01 mg/Liter below limit of quantification	50 µg/l	—	Single value · Hochzone
Fluoride	0,2 mg/Liter	1.5 mg/l	—	Single value · Hochzone
Lead	<0,003 mg/Liter below limit of quantification	10 µg/l	—	Single value · Hochzone
Mercury	<0,0003 mg/Liter below limit of quantification	1 µg/l	—	Single value · Hochzone
Nickel	<0,005 mg/Liter below limit of quantification	20 µg/l	—	Single value · Hochzone
Nitrate	33 mg/Liter	50 mg/l	—	Single value · Hochzone
Nitrite	<0,02 mg/Liter below limit of quantification	0.5 mg/l	—	Single value · Hochzone
Polycyclic aromatic hydrocarbons	0,000 mg/Liter	0.1 µg/l	—	Single value · Hochzone
Selenium	<0,003 mg/Liter below limit of quantification	10 µg/l	—	Single value · Hochzone
Uranium	<0,0027 mg/Liter below limit of quantification	10 µg/l	—	Single value · Hochzone

Indicator parameters (10)

Indicator parameters – Hochzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	<0,030 mg/Liter below limit of quantification	0.2 mg/l	—	Single value · Hochzone
Ammonium	<0,10 mg/Liter below limit of quantification	0.5 mg/l	—	Single value · Hochzone
Chloride	53,0 mg/Liter	250 mg/l	—	Single value · Hochzone
Conductivity (25 °C)	0,831 Unit not stated in the document	2,790 µS/cm	—	Single value · Hochzone
Iron	<0,01 mg/Liter below limit of quantification	0.2 mg/l	—	Single value · Hochzone
Manganese	<0,01 mg/Liter below limit of quantification	50 µg/l	—	Single value · Hochzone
pH	7,39	6,5–9,5	—	Single value · Hochzone
Sodium	28,0 mg/Liter	200 mg/l	—	Single value · Hochzone
Sulphate	67 mg/Liter	250 mg/l	—	Single value · Hochzone
Total organic carbon (TOC)	1,0 mg/Liter	ohne anormale Veränderung	—	Single value · Hochzone

Further parameters (7)

Further parameters – Hochzone
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	79,0 mg/Liter	—	—	Single value · Hochzone
Hardness range (WRMG)	hart	—	—	Single value · Hochzone
Magnesium	40,0 mg/Liter	—	—	Single value · Hochzone
Oxygen	8,1 mg/Liter	—	—	Single value · Hochzone
Potassium	6,9 mg/Liter	—	—	Single value · Hochzone
Saturation index	0,05	—	—	Single value · Hochzone
Total hardness	3,62	—	—	Single value · Hochzone

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: herzogenaurach-c5e83312.pdf · 2025 · retrieved on 11/07/2026

Show 1 more supply zone in this postcode

Tiefzone