SEMCO ENERGY GAS COMPANY
P.O. Box 79001
Detroit, MI 48279-1722
Mail Correspondence & Inquiries to:
SEMCO ENERGY GAS COMPANY
1411 Third Street, Suite A
Port Huron, MI 48060
The Network
If you have a concern regarding unethical activity in the workplace,
this toll-free number operates 24 hours a day, 7 days a week. You do
not have to give your name.
1.877.888.0002
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