Editing San Francisco Bay (section)

===Nutrients===
The bay also has some of the highest levels of dissolved inorganic nitrogen known from any coastal water body, mostly originating from treated wastewater from [[Publicly owned treatment works]].<ref>{{cite journal|title=Nutrient Status of San Francisco Bay and Its Management Implications|journal=Estuaries and Coasts|year=2020|volume=43|pages=1299–1317|doi=10.1007/s12237-020-00737-w |last1=Cloern |first1=James E. |last2=Schraga |first2=Tara S. |last3=Nejad |first3=Erica |last4=Martin |first4=Charles |issue=6 |doi-access=free |bibcode=2020EstCo..43.1299C }}</ref> In other bays, such nutrient levels would likely lead to [[eutrophication]], but historically, the bay has had less [[harmful algal blooms]] than other water bodies with similar nutrient concentrations. Potential explanations have included the presence of intensive "top-down control" from grazing clams like ''[[Potamocorbula]]'', high sediment supply limiting light availability for the algae, and intensive tidal mixing. The occurrence of an unprecedented harmful algal bloom of ''[[Heterosigma akashiwo]]'' in 2022, resulting in mass fish deaths and anoxia,<ref>{{cite news|url=https://abc7news.com/sf-bay-toxic-algae-turning-water-brown-heterosigma-akashiwo-area-waters/12135158/|title=Harmful algae bloom spreading across San Francisco Bay, turning water brown|author=Liz Kreutz|publisher=ABC7 News|access-date=February 28, 2024|archive-date=February 28, 2024|archive-url=https://web.archive.org/web/20240228190932/https://abc7news.com/sf-bay-toxic-algae-turning-water-brown-heterosigma-akashiwo-area-waters/12135158/|url-status=live}}</ref> suggests that the mechanisms of control on algal growth may be eroding.