Montana Utility Marking Concerns Phone Numbers by County

If a utility line has been marked incorrectly, marks are missing, or paint and flags have been disturbed before you dig, contact the operator that owns the line. Each operator below lists a dedicated marking concerns number for Montana.

This listing covers 19 of Montana's 56 counties, including the major population centres: Yellowstone (Billings), Missoula, Gallatin (Bozeman), Cascade (Great Falls), Lewis and Clark (Helena), Flathead (Kalispell and Whitefish) and Silver Bow (Butte). Counties not listed here are still served by Montana One Call.

Call Montana One Call at 811 or 800-424-5555 before any excavation. Under MCA 69-4-503, a notification covers work intended to commence within 10 days and be completed within 30 days, and facility owners must locate and mark within two business days — five for an engineering locate request. If you have not dug within 30 days of the marks being completed, you must request a re-mark, and a third locate at the same site is at your cost.

Before you rely on this list

This is not a complete list of operators. Operators join, leave and change numbers, and some facilities are not registered with the one-call centre at all. Treat this as a reference for finding a number quickly, not as proof of who is present on your job site.

Your 811 ticket is the authority. The ticket lists every operator notified for your specific dig location, and you should use it to confirm that all of them have responded before you break ground. If an operator on your ticket has not responded, do not dig — contact them using the marking concerns number on the ticket itself.

Broadwater County

CTLQL-CENTURYLINK — 855-640-9400

VIGILANTE ELECTRIC COOP INC — 801-364-1063

Cascade County

CHARTER COMMUNICATIONS — 406-431-0859

CITY OF GREAT FALLS — 406-727-8045

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

CTLQL-CENTURYLINK — 855-640-9400

TDS METROCOM LLC — 855-640-9400

Chouteau County

CHARTER COMMUNICATIONS — 406-431-0859

TRIANGLE COMMUNICATIONS — 406-394-7807

CITY OF FORT BENTON — 406-622-5494

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

Custer County

CUSTER CO WATER & SEWER DIST — 406-852-3924

MONTANA DAKOTA UTILITIES — 866-214-6301

MID-RIVERS TEL CO-OP — 406-274-4149

Dawson County

CENEX PIPELINES — 800-421-4122

DAWSON COUNTY ROAD DEPARTMENT — 406-377-2564

CITY OF GLENDIVE — 406-377-3318

MONTANA DAKOTA UTILITIES — 866-214-6301

MID-RIVERS TEL CO-OP — 406-274-4149

BRIDGER PIPELINE LLC — 406-853-0721

Deer Lodge County

ADLC ROAD AND SEWER DEPT — 406-563-4072

ANACONDA DEERLODGE WTR — 406-563-7111

CITY/COUNTY OF BUTTE SILVERBOW — 406-497-6540

SUPERFUND IC PROGRAM — 406-563-7476

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

Flathead County

CITY OF KALISPELL — 406-758-7720

CITY OF WHITEFISH — 406-253-0858

FLATHEAD ELECTRIC CO-OP — 406-728-9343

HUNGRY HORSE COUNTY WTR SWR DS — 406-871-7355

NWE- GAS TRANSMISSION — 406-728-9343

MONTANASKY WEST LLC. — 800-778-9140

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

CHARTER COMMUNICATIONS — 406-728-9343

CTLQL-CENTURYLINK — 855-640-9400

Gallatin County

CITY OF THREE FORKS — 406-285-3431

CHARTER COMMUNICATIONS — 406-728-9343

BLACKFOOT TEL CO-OP — 801-364-1063

FALL RIVER RURAL ELEC CO-OP — 801-364-1063

HEBGEN LAKE ESTATES — 406-640-1664

INTERMOUNTAIN INFRASTRUCTURE — 800-444-9943

NWE- GAS TRANSMISSION — 406-728-9343

MT DOT-BOZEMAN DIVISION — 406-556-4700

MONTANA OPTICOM — 406-999-5000

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

CTLQL-CENTURYLINK — 855-640-9400

AT&T COMMUNICATIONS — 800-252-1133

Lake County

MISSION VALLEY POWER — 801-364-1063

Lewis and Clark County

CITY OF HELENA — 406-431-1566

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

CTLQL-CENTURYLINK — 855-640-9400

TDS METROCOM LLC — 855-640-9400

ZIPLY FIBER — 866-290-4156

Lincoln County

NORTHERN LIGHTS, INC — 800-778-9140

ZIPLY FIBER — 866-290-4156

Meagher County

TRIANGLE COMMUNICATIONS — 406-394-7807

CITY OF WHITE SULFER SPRINGS — 406-547-3788

MT DOT-BOZEMAN DIVISION — 406-556-4700

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

Missoula County

CHARTER COMMUNICATIONS — 406-542-3900

CHARTER COMMUNICATIONS — 406-370-7205

BLACKFOOT TEL CO-OP — 801-364-1063

MISSOULA ELECTRIC CO-OP — 406-728-9343

MISSOULA PW -SEWER — 406-552-6752

MISSOULA PW WATER SEWER — 406-552-6752

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

CTLQL-CENTURYLINK — 855-640-9400

TDS METROCOM LLC — 855-640-9400

MISSOULA COUNTY PUBLIC SCHOOLS — 406-728-2400

AT&T COMMUNICATIONS — 800-252-1133

PHILLIPS 66 PIPELINE LLC — 918-977-7816

Phillips County

BIG FLAT ELECTRIC CO-OP INC — 406-654-2040

TRIANGLE COMMUNICATIONS — 406-394-7807

Ravalli County

CHARTER COMMUNICATIONS — 406-542-3900

GRIZZLY BROADBAND LLC — 406-728-9343

NWE- GAS TRANSMISSION — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

RAVALLI CTY ELECTRIC CO-OP — 406-728-9343

Richland County

ONEOK ROCKIES MIDSTREAM, LLC — 918-588-7111

KINDER MORGAN / HILAND — 701-641-8766

MID-RIVERS TEL CO-OP — 406-687-3391

WHITE ROCK OIL & GAS LLC — 406-480-1058

Silver Bow County

CHARTER COMMUNICATIONS — 406-728-9343

CITY/COUNTY OF BUTTE SILVERBOW — 406-497-6540

FATBEAM LLC — 801-364-1063

NWE- GAS TRANSMISSION — 406-728-9343

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

CTLQL-CENTURYLINK — 855-640-9400

TDS METROCOM LLC — 855-640-9400

ZIPLY FIBER — 866-290-4156

Sweet Grass County

CITY OF BIG TIMBER — 406-930-0379

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

NORTHWESTERN ENERGY GAS DIST — 406-728-9343

TRIANGLE COMMUNICATIONS — 406-394-7807

Yellowstone County

CHARTER COMMUNICATIONS — 406-728-9343

CITY OF BILLINGS AIRPORT — 406-670-9540

CITY OF BILLINGS P.W. DEPT. — 406-208-6110

CENEX PIPELINES — 800-421-4122

CO WTR OF BILLINGS HEIGHTS — 406-252-0539

INTERMOUNTAIN INFRASTRUCTURE — 800-444-9943

MONTANA DAKOTA UTILITIES — 406-728-9343

MID-RIVERS TEL CO-OP — 406-274-4149

NORTHWESTERN ENERGY ELECT DIST — 406-728-9343

PAR ROCKY MOUNTAIN MIDSTREAM — 406-591-9148

CTLQL-CENTURYLINK — 855-640-9400

TCT WEST, INC — 307-272-4335

TDS METROCOM LLC — 855-640-9400

WBI ENERGY TRANSMISSION — 888-859-7291

AT&T COMMUNICATIONS — 800-252-1133

YELLOWSTONE VLY ELECTRIC CO — 406-348-3411

PHILLIPS 66 PIPELINE LLC — 918-977-7816

ZIPLY FIBER — 866-290-4156

What 811 will not mark

811 only marks public utilities up to the meter. Private lines past that point belong to the property owner: electrical to shops, barns, well pumps and outbuildings, irrigation, septic lines, private water lines, gas to a pool heater or fire pit, and anything a previous owner installed.

Montana law addresses this directly. A facility owner may attempt to identify a private facility connected to its own, but is not liable for the accuracy of that locate — MCA 69-4-503(7). If accuracy matters, have private lines located separately.

Advanced Underground Utility Locating Inc locates the private lines 811 will not mark, across Montana, Idaho, Washington and Oregon. Call 509-710-2621. Emergency service is available 24 hours.

Source: Montana One Call operator listings, compiled September 2026. Numbers change, so verify with Montana One Call before relying on any listing.