A city allow residents to recycle used motor oil and dispose of toxic waste free of charge. How does this contribute to conservation of the oceans?

Oceans often get oil and toxic waste dumped into them as a bit of a "cheat" to cheaply dispose of waste. This harms the ocean life greatly. A leading cause of dumping into the oceans is the expense of getting rid of used oil. If a city were to allow residents to dispose of these things at no cost to them, there would be no need for people to dump it into the ocean. This will reduce the harm to sea life.