Eutrophication

Eutrophication is a big word that describes a big problem in the nation's estuaries.

Source: tatoeba (6675698)

The primary culprits in eutrophication appear to be excess nitrogen and phosphorus—from sources including fertilizer runoff and septic system effluent to atmospheric fallout from burning fossil fuels—which enter waterbodies and fuel the overgrowth of algae, which, in turn, reduces water quality and degrades estuarine and coastal ecosystems.

Source: tatoeba (6675699)

Until now, little research had been done into how eutrophication might affect waterborne parasites, which cause health problems ranging from skin rashes to river blindness.

Source: tatoeba (11729391)

I already hinted at the problem of sea eutrophication (where excess nutrients cause algae to flourish) due to the phosphates that used to be added to washing powder, and, surely, it is not pleasant for plants to find underfoot (or, better, "underroot") those surfactants we use daily at home (please, never pour your dishwater on the roots of a magnificent camellia, even if it is blooming in the garden of a next-door neighbor you cannot stand).

Source: wiktionary