Drinking water quality at the highest level

The supply of drinking water to the population is subject to the very strict provisions of the German drinking water ordinance. In the course of the drinking water analysis, over 100 individual parameters are investigated.

In addition to the standard analytics of the drinking water supply, many elaborate and complex chemical-physical and microbiological processes are available for trace substance analytics in the company and research laboratory of the Landeswasserversorgung. Mass spectrometric analysis methods and biological testing systems with the aid of luminescent bacteria, enzymes or genetically modified yeast cells reflect the latest development status.

The quality control of the Landeswasserversorgung comprises around 400,000 individual analyses per year, many online measurements in the entire supply network, and an extensive safety concept. Around 40 highly qualified employees in the Landeswasserversorgung company and research laboratory are available for these tasks. Furthermore, they work on other process developments as part of various research projects.

Employee in the operating and research laboratory with analysis bottles

Operation and research laboratory of the Landeswasserversorgung

Drinking water analysis in brief
The annual mean values 2021 for your city/municipality

The Landeswasserversorgung supplies around 3 million people in Baden-Württemberg and Bavaria, from A for Aalen to Z for Ziertheim. Are you interested in the annual mean values for your city/community?

Drinking water analysis in summary (2023)

Parameter Value Limit according to drinking
water ordinance
pH value 7,64 at 12,5 °C ≥ 6,5 and ≤ 9,5
Calcium 75 mg/L -
Chloride 32,1 mg/L 250 mg/L
Iron < 0,01 mg/L 0,200 mg/L
Magnesium 11,7 mg/L -
Sodium 13,0 mg/L 200 mg/L
Sulphate 24,5 mg/L 250 mg/L
Lead < 0,0005 mg/L 0,010 mg/L
Fluoride 0,06 mg/L 1,5 mg/L
Nitrate 20,4 mg/L 50 mg/L
Polycyclic aromatic hydrocarbons < 0,0001 mg/L 0,00010 mg/L
Pesticides per individual substance < 0,00005 mg/L 0,00010 mg/L
Total individual substances < 0,0001 mg/L 0,00050 mg/L
Carbonate hardness 10,1 °dH -
Total hardness 13,3 °dH -
Total alkaline earths 2,37 mol/m³ -
Hardness range medium -


The values given refer to the drinking water of the state water supply. Your city or municipality may use its own drinking water sources and mix its own water with the drinking water of the LW. You can obtain the current drinking water analysis for your place of residence from your city or municipal administration or from the responsible public utility company.

Drinking water analysis in summary (2023)

Parameter Value Limit according to drinking
water ordinance
pH value 7,61 at 8,2 °C ≥ 6,5 and ≤ 9,5
Calcium 71 mg/L -
Chloride 22,4 mg/L 250 mg/L
Iron < 0,01 mg/L 0,200 mg/L
Magnesium 9,2 mg/L -
Sodium 7,9 mg/L 200 mg/L
Sulphate 13,3 mg/L 250 mg/L
Lead < 0,0005 mg/L 0,010 mg/L
Fluoride 0,06 mg/L 1,5 mg/L
Nitrate 31,6 mg/L 50 mg/L
Polycyclic aromatic hydrocarbons < 0,0001 mg/L 0,00010 mg/L
Pesticides per individual substance < 0,00005 mg/L 0,00010 mg/L
Total individual substances < 0,0001 mg/L 0,00050 mg/L
Carbonate hardness 9,1 °dH -
Total hardness 12,1 °dH -
Total alkaline earths 2,17 mol/m³ -
Hardness range medium -


The values given refer to the drinking water of the state water supply. Your city or municipality may use its own drinking water sources and mix its own water with the drinking water of the LW. You can obtain the current drinking water analysis for your place of residence from your city or municipal administration or from the responsible public utility company.

Drinking water analysis in summary (2023)

Parameter Value Limit according to drinking
water ordinance
pH value 7,99 at 9,0 °C ≥ 6,5 and ≤ 9,5
Calcium 49 mg/L -
Chloride 7,7 mg/L 250 mg/L
Iron < 0,005 mg/L 0,200 mg/L
Magnesium 8,5 mg/L -
Sodium 5,3 mg/L 200 mg/L
Sulphate 33,0 mg/L 250 mg/L
Lead < 0,005 mg/L 0,010 mg/L
Fluoride 0,09 mg/L 1,5 mg/L
Nitrate 4,0 mg/L 50 mg/L
Polycyclic aromatic hydrocarbons < 0,0001 mg/L 0,00010 mg/L
Pesticides per individual substance < 0,00005 mg/L 0,00010 mg/L
Total individual substances n.e. 0,00050 mg/L
Carbonate hardness 7,27 °dH -
Total hardness 9,0 °dH -
Total alkaline earths 1,61 mol/m³ -
Hardness range medium -


The values given refer to the drinking water of the state water supply. Your city or municipality may use its own drinking water sources and mix its own water with the drinking water of the LW. You can obtain the current drinking water analysis for your place of residence from your city or municipal administration or from the responsible public utility company.

If you are interested in the current, complete analysis of the LW drinking water, you can view or download it here. The different supply areas (VB1, VB2, VB3) are marked in color. Their allocation to the supply area of the Landeswasserversorgung can be seen in the map below.

The analyzed measured values usually change only slightly from year to year.

Current drinking water analysis (accessible)

VB1 is supplied from the Langenau waterworks, VB2 from the Egau waterworks, and LW water and external water is distributed in VB3.
VB1 is supplied from the Langenau waterworks, VB2 from the Egau waterworks, and LW water and external water is distributed in VB3.

Supply area of the Landeswasserversorgung

Two children drink water from glasses, in the background their parents

Drinking water – Because of the elaborate and regular investigations, it is one of the best controlled foodstuffs