Table 1. Results from the physicochemical and microbiological water analysis.

Parameter	Unit	Maximum permissible value1	Tap water2	Pond water
turbidity	NTU	1.0	0.17	128.8
pH	pH	6.5–9.5	7.68	7.6
electric conductivity (25°C)	µS/cm	2790	559	493
calcium	mg/l	-	71	82.8
potassium	mg/l	-	1.9	5.52
magnesium	mg/l	-	5.6	2.84
ammonium	mg/l	0.5	<0.07	0.087
iron	mg/l	0.2	<0.02	0.719
manganese	mg/l	0.05	0.01	0.174
nitrate	mg/l	50	2.7	<1
nitrite	mg/l	0.5	<0.01	<0.01
acid capacity up to pH = 4.3	mmol/l	-	2.31	2.8
total organic carbon (TOC)	mg/l	-	2.8	13.0
total hardness	°d	-	11.6	12.2
total viable count of bacteria (36°C/24 h)	cfu/ml	100	0	2.31×103
total viable count of bacteria (20°C/44 h)	cfu/ml	100	0	3.31×103
Escherichia coli	cfu/100 ml	0	0	0
Enterococci	cfu/100 ml	0	0	67
Campylobacter spp.	cfu/ml	-	0	0

¹values are obtained from the German drinking water regulation [37].

²results are shown as mean values from January – December 2013.