Sewage & Wastewater Treatment in Hawaii When it comes to the treatments of sewage and wastewater, you need to make sure that it is done perfectly. The reason for this is that sewage and wastewater are potentially incredibly dangerous. Valley Isle Pumping utilizes high pressure water “jet” machines to clean and flush pipe lines. Visit valleyislepumping.com to showing “before” and “after” pipe line cleaning projects. in Public bookmarkswith sewage-treatment-mauiby 6 users