Issues related to nutrient loads and HABs addressed across case studies
| Country . | State/Prov . | Management area . | Dominant nutrient source . | Addressed issues . | ||||
|---|---|---|---|---|---|---|---|---|
| HABs . | Limited recreation . | Internal loading . | Massive fish kills . | Drinking supply shutdown . | ||||
| Australia | Multi | Murray–Darling basin | Agriculture | • | • | • | •a | |
| Canada | MB | Lake Winnipeg | Multiple/upstream jurisdictions | • | • | • | • | b |
| Canada | ON | Lake Simcoe | Agriculture/atmosphere/urban | • | • | • | ||
| Canada | PEI | Prince Edward Island | Agriculture | •c | ||||
| Canada-USA | Lake Erie | Agriculture–urban | • | • | • | • | • | |
| China | Lake Tahiu | Agriculture–urban | • | • | • | • | ||
| France | Brittany | Agriculture | • | • | • | |||
| France-Switzerland | Lake Léman | Natural/WWTP outlet | • | •d | ||||
| USA | MD-VA | Chesapeake Bay | Agriculture/urban | • | • | • | • | |
| USA | Gulf of Mexico | Agriculture | • | • | • | • | ||
| USA | IA | State of Iowa | Agriculture/WWTP | • | • | • | ||
| USA | AR | State of Arkansas | Agriculture/urban | • | • | • | ||
| USA | OR | State of Oregon | Multiple | • | • | •e | ||
| Country . | State/Prov . | Management area . | Dominant nutrient source . | Addressed issues . | ||||
|---|---|---|---|---|---|---|---|---|
| HABs . | Limited recreation . | Internal loading . | Massive fish kills . | Drinking supply shutdown . | ||||
| Australia | Multi | Murray–Darling basin | Agriculture | • | • | • | •a | |
| Canada | MB | Lake Winnipeg | Multiple/upstream jurisdictions | • | • | • | • | b |
| Canada | ON | Lake Simcoe | Agriculture/atmosphere/urban | • | • | • | ||
| Canada | PEI | Prince Edward Island | Agriculture | •c | ||||
| Canada-USA | Lake Erie | Agriculture–urban | • | • | • | • | • | |
| China | Lake Tahiu | Agriculture–urban | • | • | • | • | ||
| France | Brittany | Agriculture | • | • | • | |||
| France-Switzerland | Lake Léman | Natural/WWTP outlet | • | •d | ||||
| USA | MD-VA | Chesapeake Bay | Agriculture/urban | • | • | • | • | |
| USA | Gulf of Mexico | Agriculture | • | • | • | • | ||
| USA | IA | State of Iowa | Agriculture/WWTP | • | • | • | ||
| USA | AR | State of Arkansas | Agriculture/urban | • | • | • | ||
| USA | OR | State of Oregon | Multiple | • | • | •e | ||
WWTP stands for wastewater treatment plant.
aDrinking water supply shutdowns for the Murray–Darling basin are also linked to extreme low flow conditions.
bLake Winnipeg is not used as a source of drinking water.
cNot a common issue (51 fish kills over 1962–2017), but still addressed because they were mainly (72%) caused by pesticides.
dCurrently very limited impact, but historically prevalent.
eTo our knowledge, no drinking water shutdown happened yet. Still, the problem is addressed at the state level given that all warning signs are on.