What Happens to Fish When Our Pills Reach the Water?
Release Date: 09/30/2026
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What Happens to Fish When Our Pills Reach the Water?
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In 2001, government scientists started adding a tiny amount of the synthetic estrogen found in birth control pills to a remote lake in northwestern Ontario, at levels already measured in city wastewater. Within seven weeks, male fish were making egg-yolk protein. After two summers, some had eggs growing in their testes, and the fathead minnow population collapsed to about 1% of normal. Andrew explains how the same chemistry leaves our bodies every day, passes through treatment plants built for sewage and bacteria, and flows into rivers, lakes, and the coast. Hormones are only part of it. In...
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California Votes on 15 MPA Changes in October. Who Got a Say?
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California has a network of 124 marine protected areas, and in October the state's Fish and Game Commission takes up 15 proposals that could change it. The proposals came out of the network's first 10-year management review, an adaptive management process written into the law so the network could respond to shifting fish populations, a warming climate, and evolving public values. Anupa Asokan, founder of Fish On, explains what that review looked like from inside the room. Anupa is a marine scientist, angler, and surfer who started Fish On to give conservation-minded anglers and spearfishers a...
info_outlineIn 2001, government scientists started adding a tiny amount of the synthetic estrogen found in birth control pills to a remote lake in northwestern Ontario, at levels already measured in city wastewater. Within seven weeks, male fish were making egg-yolk protein. After two summers, some had eggs growing in their testes, and the fathead minnow population collapsed to about 1% of normal. Andrew explains how the same chemistry leaves our bodies every day, passes through treatment plants built for sewage and bacteria, and flows into rivers, lakes, and the coast.
Hormones are only part of it. In Sweden, researchers at Umeå University found that perch exposed to the anti-anxiety drug oxazepam, at levels matching wild fish, became bolder, fed faster, and drifted away from their schools, all behaviours that make a small fish easier to eat. Andrew then goes back to DDT, when bald eagles fell to 417 nesting pairs in the lower 48 states before the 1972 US ban let them climb past 71,000 breeding pairs.
The recovery story continues at Lake 260. Once the hormone additions stopped, the minnows came back to pre-experiment levels within three years. Switzerland is now upgrading about 120 treatment plants with ozone or activated carbon to remove more than 80% of these micropollutants, paid for by a small annual fee per person. Andrew closes with the part you control today: take your leftover and expired medications back to a pharmacy.
Takeaways:
- Your body doesn't use every bit of a pill, and what's left leaves in urine.
- Most treatment plants remove solids and bacteria, and many drug compounds pass straight through.
- At Lake 260, synthetic estrogen at about 5 to 6 nanograms per litre collapsed the fathead minnow population to about 1%.
- Lake trout that ate those minnows declined too.
- Oxazepam made perch bolder, faster feeders, and loners, raising their risk from predators.
- Bald eagles went from 417 nesting pairs in 1963 to more than 71,000 breeding pairs after DDT was banned.
- Lake 260's minnows recovered within three years once the hormone additions stopped.
- Switzerland is adding ozone and activated carbon treatment to about 120 plants to remove more than 80% of micropollutants.
- Ontario's free pharmacy return program collected more than 330,000 kg of medications in 2024.
- Keep taking what your doctor prescribes, and return the leftovers to a pharmacy instead of flushing or trashing them.
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