The hormones you take don’t hurt only you

Effluent from a wastewater treatment plant in Montreal was found to contain:

(measured in nanograms of hormone per liter of water)

90ng/L Estradiol - a natural estrogen, prescribed for HRT (Hormone Replacement Therapy)

53ng/L Norethindrone - used in BCPs (Birth Control Pills), HRT, and menstruation regulation

30ng/L Levonorgestrel - used in BCPs and morning after pills

The latter two are synthetic progestagens, compounds which mimic progesterone.  Human and animal excretion is considered the primary source of natural and synthetic estrogens and progestagens found in aquatic ecosystems.  Some of these hormones have been shown to reach our drinking water as well.  These hormone levels are sufficient enough to have endocrine-disrupting effects in wild aquatic ecosystems, which are receiving the effluent.  In some fish, exposure to as little as 1ng/L of a hormone can result in hermaphroditism, feminization and decreased fertility.  The numbers found in the Montreal effluent were between 30 and 90 times that amount!  Pretty scary.

Study Reference: Viglino L., K. Aboulfadl, M. Prevost, S. Sauve. 2008. Analysis of natural and synthetic endocrine disruptors in environmental waters using online preconcentration coupled with LC-APPI-MS/MS. Talanta 76: 1088-1096.