quote "daka1" :
One unfortunate thing about jet skis is that they make a terrible noise and pollute the air and water.
A two-hour jet ski ride can add several gallons of oil and gasoline to the water.
All water craft in Califiornia is now required to have a 4 cycle engine in order to prevent the oil contamination of a 2 cycle engine. Many older jet skis, personal water craft and boats have had to be refitted with equiptment which will capture or recycle the water that was discarded when used to cool the engine.
This law was passed back in the 1990's due to the pollution of Lake Tahoe and Nevada passed the same laws to protect Lake Tahoe and Lake Powell.
I believe that Arizona, if it hasn't already passed this law soon will in order to protect the Colorado River as it is the border between California for a great distance.