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Ottawa Township Flat Glass Site

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  • Naplate, Illinois (La Salle County)
  • EPA ID# ILD005468616
  • Alias(es): Libby Owens Ford Plant 5 & 7 site, Pilkington North America Incorporated
  • Map (PDF) (1pg, 552K)
Contact Information

Community Involvement Coordinator
Heriberto León (leon.heriberto@epa.gov)
312-886-6163 or 800-621-8431, ext. 66163

Remedial Project Manager
Jennifer Elkins


(where to view written records)

Reddick Library,
1010 Canal St.,
Ottawa, Ill.
Phone: 815-434-0509


The Ottawa Township Flat Glass site, also known as the Libby Owens Ford Plant 5 & 7 site, is located in Naplate, LaSalle County, Illinois. The 228-acre site consists of a glass manufacturing facility ("Plant #7" [currently inactive] and "Plant #5") located on the north side of the Illinois River plus former silica sand quarries, wastewater disposal areas, and a 56-acre undeveloped parcel of land. It also includes additional former silica quarries and wastewater disposal areas across from the facility on the south side of the river.

The manufacturing plant has been making flat glass products since about 1907. Arsenic trioxide was a minor ingredient in the manufacturing process from 1907 until 1970 when its use was discontinued. The final step in the manufacturing process involved grinding and polishing cast glass with fine silica sand and water. The process generated a waste slurry containing mostly sand, water, and glass particles (containing arsenic) which was discharged into the former quarries for settling of solids and discharge of overflow water into the Illinois River. The slurried waste in the settling areas contains appreciable levels of arsenic and is a source of arsenic contamination in local area groundwater as well as being a direct contact or ingestion threat to human and ecological receptors.

Pilkington North America (PNA) has owned and operated the glass manufacturing facility since 1986.

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