• used water
• human body waste
• toilet paper

To ensure for this system to work properly, here are some best practices to follow:

Do Not		Do
Do not pour fats, oils and grease from cooking down the kitchen sink drain or garbage disposal		Collect grease in a container and dispose of it in the garbage
Do not use the sewer to dispose of food scraps		Place food scraps in the garbage for disposal with solid waste, or start a compost pile
Do not use the toilet as a wastebasket for garbage or chemicals. (These items can kill "good" bacteria used for sewage treatment, cost much more to treat, and can enter the Bay)		Place a wastebasket in the bathroom to dispose of solid waste. (Disposal diapers and personal hygiene products do not belong in the sewer system)
Do not put produce stickers down the drain		Avoid planting trees with shallow, spreading root systems near your sewer lateral. Tree roots seek water sources, such as cracked sewer lines. Once the roots have penetrated the line through cracks, the roots can create a dense mat and trap materials