Definitely check your state's pesticide laws and the labeled water-use restrictions for each product.
The PA Bureau of Plant Industry is the agency that oversees and enforces both EPA and PA-specific pesticide laws for your state. According to the PA Pest Control Act of 1973, section 17
PA Pesticide Control Act of 1973 , an individual must be licensed as a private applicator
IF a pesticide designated as "restricted-use" will be utilized.
Neither fluridone (SONAR) nor 2,4-D (AQUA-KLEEN or NAVIGATE) are Federal
Restricted-Use Pesticides (as designated by the EPA). Therefore, unless these products are designated in PA as "state limited-use pesticides", it would appear that a private applicators license is not required for their use - at least not on your own property.
However, this finding was the result of a quick search of the website linked above. It would be wise to verify this assessment through a local authority (county agricultural agent, etc.).
Whether or not an applicators license is "required" in your state, it is still your legal and moral obligation to read and comply with the labeled directions for all pesticides.
