Hydrozones Statistical parameter NO3 [mg/L] Accumulative-erosive Warsaw-Blonie terrace called Blonski level mean 12.35 standard error 6.21 median 9.32 standard deviation 12.88 range 38.18 minimum 1.33 maximum 39.52 Warsaw’s suburbs mean 22.49 standard error 14.21 median 5.11 standard deviation 31.77 range 111.44 minimum 3.55 maximum 115.00

Table 9: Nitrate concentration in groundwater in selected KNP hydrozones.