WASTE WATER TREATMENT PLANT
The Spearfish Wastewater Treatment Plant which sets 3 miles north of
the City was built in 1982 with a design flow for treatment at 850,000
gallons per day. The majority of the wastewater flows by gravity to the
facility. The plant capacity was updated in 1993 to treat up to 1.4 million
gallons per day (MGD).
The treatment process known as “Activated Sludge” is followed
by secondary clarification, tertiary filtration, and is disinfected before
following the 3 mile outfall line to Spring Creek. The byproduct of the
wastewater, referred to as “Biosolids”, is currently incorporated
into the soil on a dedicated site at the treatment facility.
The facility is currently operated by the plant superintendent and four
other certified operators. The plant consistently operates within the
discharge permit parameters. Since the start up in 1982, the facility
has been awarded the EPA Region VIII award for Excellence in Operations
and Maintenance twice and also the EPA National Award for Excellence
in Operations and Maintenance in 1986.
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