Removing Arsenic From Our Drinking Water
The City of Fernley’s Water Treatment Plant (WTP) began construction in October, 2007. The WTP is being constructed to bring the City of Fernley into compliance with the United States Environmental Protection Agency’s (EPA) Clean Water Act. The Clean Water Act was revised to include a Maximum Contaminant Level (MCL) of 10 micrograms per liter (ug/l) for Arsenic. The old standard was 50 ug/l. Arsenic is present in the City’s groundwater supply and must be reduced below 10 ug/l prior to distribution to customers. (See the EPA's Arsenic Rule)
While the City and the State of Nevada entered into a Bilateral Compliance Agreement that extended the compliance period to July 23, 2009, the plant will take approximately 22 months to construct.
The WTP will remove Arsenic through a three step process: coagulation – flocculation/sedimentation – microfiltration. While these words are worthy of the National Spelling Bee, the process can be simplified in the following description:
Raw water will enter the plant and be injected with an iron-based liquid (coagulation) which acts as a “magnet for arsenic.” The coagulated water will then be mixed up (flocculation) in one area, and then allowed to settle (sedimentation) in another area. Any remaining arsenic will be removed when the water is put through filters with very tiny pores (microfiltration). Any material that will be removed in the process will be sent to ponds, dried, and then shipped to the Lockwood Landfill.
The project is located on a parcel just north and west of the west end of Mesa Drive. The project also includes improvements to Mesa Drive and will be built to be aesthetically pleasing, including modern architecture, low impact down-facing lights, and substantial landscaping. The project is designed to comply with all laws and safety guidelines and will be safe to the public. The project is designed to treat arsenic from the current levels, which average 50 parts per billion, to comply with the EPA standard of 10 parts or less per billion.