Much of what you see are plastics products, items that don't break down easily. If you smoke, don't throw your cigarette butts out the car window or along the street when walking. Use ashtrays and garbage cans. Tobacco may break down easily but the filters don't. Recycle cans, glass and paper and compost yard waste.
Less trash means less space dedicated to landfills.
To reduce water use, repair leaking faucets, install low-flow faucets and toilets and only wash full loads of laundry. If you have a septic system, maintain it. Without regular pumping, septic tanks can fail, which not only harms the environment but can also contaminate drinking wells. Everything that goes down the drain eventually ends up in our waterways. Household cleaning products, car care products and paints are just a few of the chemicals that are dumped down drains every day.