Call 811 Before You Dig

Prevent pipeline damage

Always have underground gas lines located before beginning any excavation activity, even when conducting minor excavation.

  • Installing a sprinkler system

  • Installing a mailbox

  • Installing a fence

  • Planting a hedge

Call 811

If you are planning to dig, call the Hawaii One Call Center at least five (5) working days before you dig by dialing 811. Be sure to give them the address and location of the cross street(s) nearest where you plan to dig. Hawaii One Call Center will contact all local utilities to tone, mark or identify the location of underground utilities, for FREE. Mark the area where you plan to excavate in WHITE as Hawaii Gas uses yellow markers (paint, ribbon, stakes, etc.) to mark our facilities.

For Contractors

Safety is everyone’s responsibility. Any excavation in the public rights-of-way (the strip of land over which facilities such as highways, power lines or utilities are built) or on private property not exclusively owned by the excavator must adhere to the following procedure:

  • Have an excavation permit issued by the County or the State, depending on jurisdiction, with clearances from all affected utility companies.
  • Call the Hawaii One Call Center at 811 at least five (5) working days before you dig. Excavators may call the Hawaii One Call Center any day of the week, 24 hours a day, 365 days a year.
  • Hawaii Gas will provide you with the location of their pipes if there are gas lines in the area of your dig site. It is the responsibility of the excavator to determine the exact location (i.e. alignment and depth) of the pipes.
  • To determine the exact location of the pipes, carefully hand dig until the gas line is exposed. Do NOT use power equipment. Use suitable, rock-free material for backfill to avoid damage to the pipe or pipe coating.
  • Look for the presence of other utility infrastructure such as fire hydrants, electrical conduits, telecommunications cables, sewer pipes, underground electrical vaults, etc. Avoid working too close to utility facilities. Use hand digging instead of power equipment if needed.
  • Excavation in or near public rights-of-way can affect public safety. If you are aware of any unauthorized digging or construction in public rights-of-way or if you notice any suspicious activity in the vicinity of gas pipelines, contact the Hawaii One Call Center at 811.

For Homeowners

Homeowners are encouraged to call the Hawaii One Call Center at 811 at least five (5) working days before they start any type of project involving excavation, including planting a hedge or installing a mailbox, fence, sprinkler system, deck, or pool, etc.

Recognizing Gas Pipelines

Our gas pipelines are made of steel or high-density polyethylene, and are as large as 16 inches and as small as 1/4-inch in diameter. Wherever possible, Hawaii Gas buries pipes with yellow warning tape; however, all underground facilities should be treated with caution. Never assume a pipe is abandoned – at times polyethylene pipe is inserted into an older steel pipe. On O‘ahu, Hawaii Gas posts yellow warning signs along our high-pressure transmission pipeline from Kapolei to Pier 38.

Residential customers should have their piping checked once every five years and commercial customers should check their piping annually.