Question

which is an environmental concern? having groundwater affected by a nearby landfill taking plastic containers to a recycling facility running the dishwasher only when it is full treating and processing water for a community

Explanation:

Environmental concerns involve negative impacts on the environment. Groundwater affected by a landfill is a pollution - related environmental issue. Recycling plastic containers (option 2) is an environmentally friendly action. Running the dishwasher only when full (option 3) is a water - conservation measure (positive). Treating and processing water for a community (option 4) is a necessary utility service (not a concern).

Answer:

having groundwater affected by a nearby landfill