Which of the following is NOT a solution to lowering atrazine concentrations in aquatic waterways?

The correct choice is the option that suggests increasing the EPA allowable atrazine concentration. This approach does not address the issue of atrazine pollution in aquatic environments; rather, it would potentially allow for higher concentrations of atrazine in waterways, which could exacerbate the problem of contamination and its harmful effects on aquatic life and human health.

In contrast, reducing agricultural use of atrazine, promoting organic farming practices, and implementing better runoff management are all proactive strategies aimed at decreasing the amount of atrazine that enters water systems. Reducing agricultural use would directly lower the quantity of atrazine applied to fields, while promoting organic farming would eliminate atrazine usage altogether. Additionally, better runoff management practices can help minimize the transport of this herbicide into waterways, thus effectively reducing its concentrations and mitigating environmental impacts.