I will start with a disclaimer: this is not medical advice nor do I know the effectiveness of the following.
In recent years, we have heard of pharmaceuticals, fertilizer, anti-bacterial agents and birth control hormones entering our drinking water systems. We can eliminate fertilizer use on our lawns, stop using anti-bacterial soap and return unused drugs to the pharmacy but we can't stop women who use birth control from urinating.
I suppose something could be done about waste treatment before it re-enters the environment. The hormones wreak havoc on fish populations and could be in the drinking water. What if a birth control alternative existed? Charting, formally known as Fertility Awareness Method, can be used as a birth control method. Basically, cycles are monitored and sexual activity is limited to certain times. Once adopted it becomes a habit and simple. Sounds like the ease of use associated with pills. May not be for everyone but it does have a positive environmental benefit.