Estrogens concentrations WWTP 1 WWTP 8 WWTP 9 WWTP 3 WWTP 6 WWTP 7 WWTP 5 WWTP 2 WWTP 4 Jan-Mar Jan-Mar Jun-Aug Feb-Apr Feb-Apr Jun-Aug Apr-Jun Oct-Dec Apr-Jun Number of people served by each WWTP 3 000 3 000 3145 5 000 6 000 20 500 50 000 180 000 203 202 IIn IIn OOut IIn IIn OOut IIn OOut IIn OOut IIn OOut IIn OOut IIn OOut IIn OOut E3 (µg L-1) 0.24 0.15 0 0.15 0 0 00,25 0 0.16 0 0.15 0 0.14 0 0.24 0.12 0 0 SD 0±0.01 ±±0.02 0 ±±0.02 0 0 ±±0.03 0 ±±0.04 0 ±±0.02 0 ±±0.01 0 ±±0.02 ±±0.02 0 0 E2 (µg L-1) 0 0 0 0 0 0 0 0 .0.25 0.19 0 0 0 0 0 0 0.14 0.1 SD 0 0 0 0 0 0 0 0 ±±0.02 ±±0.03 0 0 0 0 0 0 ±±0.03 ±±0.01 EE2 (µg L-1) 0.13 0.14 0 0.14 0 0 00,16 0 0.19 0 0.14 0 0.18 0 0.15 0.12 0.14 0 SD ±±0.01 ±±0.03 0 ±±0.03 0 0 ±±0.02 0 ±±0.02 0 ±±0.03 0 ±±0.02 0 ±±0.02 ±±0.02 ±±0.06 0 E1 (µg L-1) 0 0 0 0 0 0 0.23 0.16 0.16 0.15 0 0 0 0 0 0 0.72 0.25 SD 0 0 0 0 0 0 ±±0.02 ±±0.01 ±±0.04 ±±0.02 0 0 0 0 0 0 ±±0.12 ±±0.02

Table 4: Occurrence of selected estrogens concentrations, expressed in μg per liter (n=3), in raw wastewater´s WWTP´s raw wastewater´s and treated wastewater´s of nine plants investigated.