But the drugs have remained a problem, partly because of poor water quality.
Poor water quality from land-based run-off, coastal development and fishing remain concerns.
The visitors are apparently not deterred by relatively poor water quality.
After climate change, poor water quality is the biggest threat to the reef.
One of the issues here is that there's not just poor water quality in the gulf, there's also poor water quality in the middle of the United States.
"Those problems include mycobacteriosis, overfishing of menhaden and poor water quality".
The lake will gradually become eutrophic, with relatively poor water quality and high biological production.
While disturbances are inevitable, in most instances they need not contribute to poor water quality.
Some stations close to the Seoul metropolitan area, however, still exhibited poor water quality conditions.
Raising awareness of poor water quality can be challenging, but more organisations are stepping up to the task.
The Bay of Quinte, Ontario, receives excessive nutrient loads and suffers from poor water quality.
