Pharmaceutical pollution disrupts salmon migration: systemic risks of wastewater contamination on aquatic ecosystems

Indigenous knowledge systems, such as those of the Coast Salish peoples, recognize salmon and rivers as kin with inherent rights, not resources to be managed. Their water-monitoring practices, including bioindicators like salmon behavior and water clarity, have been systematically suppressed by colonial water governance. The current crisis reflects a rupture in these reciprocal relationships, where industrial effluents are treated as externalities rather than violations of sacred duty. Reintegrating Indigenous protocols—such as the *Nisga'a* principle of *adaawak* (respect for all beings)—could reframe pollution as a moral failure, not just a technical one.

The contamination of aquatic ecosystems by pharmaceuticals is a predictable outcome of the post-WWII chemical revolution, where synthetic drugs became ubiquitous without corresponding advances in wastewater treatment. The 1972 Clean Water Act in the U.S. and similar policies in Europe were designed to address visible pollutants (e.g., sewage, heavy metals) but failed to anticipate the rise of 'emerging contaminants' like cocaine metabolites. Historical parallels include the DDT crisis, where short-term agricultural gains led to decades of ecological collapse, yet regulatory responses remain reactive rather than preventive.

In contrast to Western toxicology’s focus on individual organisms, many non-Western traditions view contamination as a disruption of communal and ecological harmony. The Japanese concept of *wa* (harmony) extends to water bodies, where pollution is seen as a failure of collective responsibility. In African Ubuntu philosophy, 'I am because we are' implies that human and ecosystem health are inseparable, suggesting that pharmaceutical pollution is a symptom of fractured social-ecological bonds. These frameworks highlight the need for solutions that restore relational, not just chemical, balance.

Scientific evidence confirms that pharmaceuticals and their metabolites—including cocaine’s benzoylecgonine—are persistent in aquatic environments, with concentrations detectable in ng/L to µg/L ranges. Studies show that exposure to such compounds alters fish behavior, endocrine function, and reproductive success, though the long-term ecological impacts remain understudied. The lack of standardized monitoring for 'contaminants of emerging concern' (CECs) in wastewater reflects a gap between scientific knowledge and policy implementation. Emerging techniques like passive sampling and biomonitoring offer tools to track these pollutants at scale.

Artistic and spiritual traditions often frame water as a living entity with memory and agency, as seen in the Māori *wai* (water) cosmology or the Hindu *Ganga Mata* (Mother Ganges) narrative. Contemporary artists like Agnes Denes or Tania Candiani use water as a medium to critique industrial extraction, suggesting that pollution is not just a scientific problem but a crisis of imagination. Indigenous water ceremonies, such as the *Sweat Lodge* or *Mana Whenua* rituals, position humans as stewards rather than dominators, offering a spiritual counter-narrative to technocratic solutions.

Future scenarios for pharmaceutical pollution range from catastrophic collapse of aquatic ecosystems to regenerative co-management models. Business-as-usual projections suggest that by 2050, 60% of global river basins could face 'pharmaceutical pollution stress,' with cascading effects on fisheries and human health. Alternative models, such as circular pharmaceutical economies (e.g., drug take-back programs) or 'living machines' for wastewater treatment, could reduce emissions by 80% but require radical shifts in policy and corporate accountability. Scenario planning must integrate Indigenous knowledge and local ecological knowledge (LEK) to avoid Western-centric blind spots.

Marginalized communities—particularly Indigenous peoples, low-income neighborhoods near industrial zones, and Global South nations—face disproportionate exposure to pharmaceutical pollution due to systemic inequities in waste management and regulatory enforcement. In the U.S., Black and Latino communities are 1.5x more likely to live near Superfund sites, where pharmaceutical waste often co-occurs with other toxins. Global South nations, often used as dumping grounds for expired drugs, lack the infrastructure to treat these contaminants, exacerbating health disparities. Their exclusion from policy discussions reflects a broader pattern of environmental racism in pollution governance.