A great way to clean our water is to ban what creates the pollution going into it, especially single-use plastic, factory farms, and a lot of packaging. If they want to take baby steps, use proper accounting -- that is, charge manufacturers and buyers the true cost of cleaning the pollution their products make, which could be through a tax on pollution so those who pollute pay to clean it, not all taxpayers. Think Coca-Cola as one example of many.
We can spoon out the flood, but as long as we have to turn off the spigot, now is the most effective time.