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Follow the Flush

back to Collection System Maintenance Division


Spill control teams respond to broken City sewer lines any time, night or day.


Headworks Construction Site.


Pipeline construction.


New Hart Street Pump Station.

You flush your toilet, run the dishwasher, take a shower and the wastewater goes down the drain—most likely out of mind as soon as it is out of sight. What happens is an invisible, silent system that, when working properly, rarely gets (or needs) our attention. If your home or business is connected to the City & County of Honolulu system, wastewater is carried away from your neighborhoods through a complex network of 2,100 miles of sewer pipes and laterals. Mile-for-mile, it is longer than Honolulu's street system. Most of Oahu's homes and businesses are part of the City's centralized collection and disposal system. Along the way are 70 pump stations, four pre-treatment facilities and nine treatment plants.

Between 100-110 million gallons of wastewater takes a trip through the system every day—enough to fill Ala Moana Park and Magic Island to a depth of four feet.

Wastewater from homes, schools, businesses and factories throughout Oahu flows into a centralized collection system.

Pipes carry the wastewater from our toilets and kitchen drains to the lateral (house-to-sewer line) in the yard. Every lateral has a cleanout cap that surfaces close to the property line and is used by plumbers when the pipeline is clogged. A second, lower lateral goes from your property lateral to the City's sewer main (slightly larger pipe) and on to a wastewater treatment plant.

Last Reviewed: Monday, September 10, 2012