Utility Locator and Emergency Contacts

811, poison control, OSHA, NRC, and 911 - universal US numbers.

Reference

Contacts

811 Call before you dig (US one-call utility locator).Note: Mark all underground utilities at least two business days before any excavation. State call-before-you-dig laws govern.
1-800-222-1222 Poison Control (US national hotline).Note: Available 24 hours; routes to the nearest poison control center.
1-800-321-OSHA (6742) OSHA hotline for workplace safety incidents.Note: Use to report imminent dangers and serious injuries; recordable injury rules govern.
911 Emergency services dispatch (US).Note: Use for active fires, injuries, and life-safety emergencies.
1-800-424-8802 National Response Center (chemical and oil spills).Note: Federal reporting center for hazardous-substance releases.

Details, formula, and sources

(reference page; no compute) Universal U.S. emergency and information numbers: 911 (emergency), 811 (call before you dig), 1-800-222-1222 (Poison Help), 1-800-321-OSHA (OSHA hotline), 301-415-7000 (NRC operations), and the per-state utility locator extensions.

FCC and state-PUC published assignments; refreshed annually.

Free at call811.com, poisonhelp.org, osha.gov, and nrc.gov.

Estimate. AHJ and licensed professional govern.