Keep heavy vehicles off the disposal field area. Their weight could crush pipes and lead to extensive repairs. Don't plant deep rooted trees or shrubs over the disposal trenches. Their roots may clog pipes. Do plant grass turf or other shallow rooting plants over the disposal field.
Proper vegetation helps take moisture from the ground and the system.
However, use care in landscaping so you don't cut or dig too deeply into the disposal field area. Vegetable gardening is not recommended for the disposal field area. Deep rototilling may adversely affect the disposal field trenches. Also, there is a possibility that root crops may become contaminated. Do keep a maintenance record of your septic system.