It is the purpose of titles 1 to 11, inclusive, and title 19 of this article to provide additional and cumulative remedies to abate the pollution of the waters of the state and nothing herein contained shall abridge or alter rights of action or remedies now or hereafter existing, nor shall any such provisions or any act done by virtue of such provisions, be construed as estopping the state, persons or municipalities, as riparian owners or otherwise, in the exercise of their rights to suppress nuisances or to abate any pollution now or hereafter existing.