polluted water, avoid contact. blue circle warning sign with and text. horizontal .

exclamation advertising horizontal polluted contact warning signage circle symbol banner water avoid shape waves label blue sign text point polluted water sign contact safety warning blue contaminated waves mark text bacteria pollution sticker vector horizontal environment icon danger poisonous wastewater dirty risk information attention forbidden restricted germs caution circle nature ban public disease hazard security symbol pond river lake bacterium toxins algae hygiene care infection