NORTHWESTERN STATES PORTLAND CEMENT CO.
MASON CITY, IA
Superfund Site Profile
The Northwestern States
Portland Cement Company Site consists of an area within the Holcim (US) Inc.,
(Holcim) former cement manufacturing facility, located just north of Mason
City, Iowa, near the intersection of 25th Street and U.S. Highway
65. Cement was manufactured at the site from 1908 until 2009.
The area referred to as the West Quarry was mined for limestone, a raw material
for cement production, until 1950. The West Quarry had reached a depth of
approximately 40 feet and covered an area of about 150 acres. In 1969, the
company began using the West Quarry for the disposal of waste ...
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