I/I is clear water - stormwater and groundwater - that enters the wastewater system. It overloads the system and can cause costly sewer backkups into homes and buildings. I/I can also cause sewer overflows into rivers and lakes.

With over 2,000 miles of sewer and hundreds of thousands of service connections, there's plenty of opportunity for I/I to sneak in. Most of the I/I comes from private sources, including defective sewer service lines and improperly connected sump pumps, downspouts, and foundation drains.

• Causes sewer backups into homes
• Causes sewer overflows into rivers and lakes
• Increases sewer and utility fees
• Increases the need for larger and more expensive sewer pipes and treatment facilities

• Routine cleaning and maintenance
• Using robotic cameras to inspect pipes for cracks and roots
• Installing liners in old pipes to seal them back up
• Digging up and replacing pipes that are broken beyond repair
• Repairing cracks and holes in manholes
• Raising manhole covers in areas that are prone to flooding

• Inspect and repair damaged sewer service lines
• Replace older clay pipes that are beyond their service life
• Make sure sump pumps and building drains are not connected to the sanitary sewer system
• Cap your cleanout

• Only flush the 3 Ps (poop, pee, and *toilet* paper)
• Don't flush "flushable" wipes
• Don't dump fats, oils, and grease (FOG) in the sink. Can it, cool it, then trash it.
• Seal basement floor drains

How to properly dispose of common household items