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Utility Marking Colors
After The Call
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Utility Marking Colors
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Utility Contacts
According to Illinois state law (Section 10), each utility company must use a specific color paint or flag to mark their buried facilities. 

APWA Color Code Marking Colors:
Gas, Oil, Petroleum
Sewer
Electric
Water
Communication,
Telephone, TV
Reclaimed Water
Proposed Excavation
(Black when snow is present)
Temporary Survey