They brought to the conclusion that
municipal wastewater discharge was the major
contributor of estrogenic hormonal contamination of
urban river waters due to the increase of population
and inadequate of wastewater treatment facilities.
Theoretically, most of estrogenic hormones when
excreted were in the form of conjugated estrogens
which were not active forms, but in practice, the
active unconjugated forms were also found in the
effluents from the waste water treatment plants
(WWTP).