Dispose of motor oil, gasoline, furniture polish, cleaning fluids, paint thinners, and other chemicals as advised. Never dump these items on your property and never pour them down the drain. Refuel equipment over a hard surface so spills will not reach the soil. Repair or replace leaking fuel tanks. Limit your use of lawn garden chemicals.
Excess fertilizer moves easily through the soil to the groundwater.
Do not store or mix pesticides and fertilizers where spills can enter the soil and eventually reach the groundwater that supplies your drinking water. Install backflow protectors on all outdoor faucets. In some cases, water can siphon backwards through a hose and down the well. This is especially serious if a chemical sprayer is attached to the hose or if the hose end is under water, such as in a bucket. If you do not have backflow protection in your water supply system, an inexpensive, screw-on approved brass Atmospheric Pressure Breaker should be added to each faucet.