When used as directed, Sunday shouldn't affect your well water.
Sunday is a precision fertilization program, focused on giving your lawn nutrients when it needs them. We measure your lawn down to the square foot and send you multiple smaller applications over the course of the season, so this mitigates the risk of waste or runoff.
Our liquid nutrients are absorbed by grass quickly and effectively. Most of the ingredients we use are already present in soil. Ingredients that aren't common in soil are either organic or biodegrade rapidly.