Waste Water Treatment

The City’s wastewater treatment facility provides for treatment, disposal, and reuse, of the City’s effluent which meets all of the State’s discharge requirements, for the entire City of Hanford.  The City’s plant is a sophisticated, multi-million dollar facility which treats nearly 1.9 billion gallons of sewage each year.  The facility is a major part of the City’s effort to keep our environment clean and to provide a water resource for agricultural irrigation and reuse.

There have been four treatment plant expansion upgrades; the latest was completed in 2004, increasing our treatment capacity from 5.5 to 8.0 MGD, allowing the plant to serve over 8,000 new single-family dwellings.  The expansion included a new influent pump station, head works, grit removal, oxidation ditch, and irrigation pump station, as well as several modifications to existing buildings and structures.

The new irrigation pump station allows the City to discharge secondary treated disinfected effluent to Lakeside Ditch Company for crop irrigation of over 10,000 acres through a reclamation permit issued by the Regional Water Quality Control Board.  Staff is currently in the process of developing a new long-term reclamation project agreement with Lakeside Ditch Company.

Our lab staff consists of one full time Lab Technician, one Lab Assistant, and one Lab Attendant that splits time between office duties and fill-in lab duties.  Our Lab Tech and staff are continually certified the City’s laboratory through the State of California Department of Health Services Accreditation program.  The environmental laboratory certification allows the City laboratory to conduct analysis of environmental samples as specified in a list of approved fields of testing that are used for treatment process control, industrial user monitoring, and billing.  The laboratory accreditations program affords us the ability to produce legally definable data and reduce outside laboratory expense.  Laboratory personnel work seven days a week performing approximately 76,600 lab tests per year, collect daily samples from six permitted industrial dischargers, administer the City’s pretreatment program by issuing and monitoring over 110 non-residential discharge permits, as well as conduct inspections of all companies, collect in plant samples for process control, provide monthly billing for industrial users and Lakeside Ditch Company, and compile monthly, quarterly, and annual reports for State, Federal, and regulatory agencies.

Operations Staff
We currently have five full time operators, ranging from an Operator-in-Training to a Grade II Operator.  Our goal is to have all operators at a Grade II level within three years to comply with State Water Resources Control Board Office of Operator Certification requirement.  Operators are responsible 24 hours a day for providing treatment and disposal of the City’s wastewater to meet all State discharge requirements 100% of the time, in an environmentally safe manner, to ensure its reuse will not endanger health or degrade groundwater quality.  Operators work seven days a week, conducting on-site inspections of treatment structures, reading meters, gauges, instruments, and the SCADA system, logging daily plant records, adjusting chemical feed systems, and ensuring operational problems are identified and corrected to meet standards established in our Waste Discharge Requirements.

Staff performs preventative maintenance as scheduled 100% of the time, monitor, inspect, clean, repair, replace, and maintain pumps, motors, gear drives, and electrical systems, and painting equipment and structures throughout the plant.  They also sand blast and coal tar epoxy sedimentation basins and trickling filter arms, apply chemicals for vegetation and midge fly control on ponds and in plant areas, and biosolids processing and removal.

Centrifuge Project
In an effort to control the high cost of effluent sludge storage and disposal, management staff budgeted to purchase a solids dewatering system (centrifuge unit).  This facility will reduce the need for additional drying beds in the future.  Drying time and processing the sludge will be reduced by removing liquid before final drying in the existing sludge beds.  This process will allow us to continue to produce a Class A sludge for disposal at a licensed composting facility. 

The Wastewater Treatment Plant personnel can be contacted at (559)585-2576 during normal business hours.  If you would like to schedule a facility tour please contact the plant.