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Granger-Hunter Improvement District's sanitary sewer collection system is a series of over 300 miles of wastewater lines with more than 6,000 manholes and 13 wastewater pumping stations. The function of this collection system is to ensure the safe, consistent, trouble free conveyance of wastewater to the Central Valley Water Reclamation Facility for treatment.

The District's Wastewater Department staff is responsible for the maintenance , inspection and repair of the entire collection system. This is accomplished by the use of three combination wastewater cleaning trucks, equipped with high pressure jetting hoses and suction capability. These trucks are used to routinely clean collection system lines. State-of-the-art Closed Circuit TV trucks. These units deploy video cameras mounted on a remote controlled tractors with the ability to inspect 360° inside all District wastewater pipelines, ranging in size from 6" to 48" in diameter. In addition to maintaining pipe lines, the department also manages and maintains thirteen wastewater pumping stations.