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State file — CO

Underground storage tanks in Colorado

11,328 registered facilities · 6,985 tanks in service · 8,481 leak records · 493 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).

11,328UST facilities
6,985tanks in service
24,228closed tanks
8,481leak records
493open cases
94%cases closed / NFA

Colorado runs 12.5 tanks in service per 10,000 residents (population 5,594,670). 7,970 of its 8,481 reported releases have reached No Further Action. The regulator of record is the Colorado OPS Petroleum Program, which holds the live registration and case files.

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By county

CountyFacilitiesTanks in serviceLeak recordsOpen cases
Adams County88062471950
Alamosa County6730506
Arapahoe County80362075359
Archuleta County4830301
Baca County281990
Bent County2610131
Boulder County41727336818
Broomfield County6863706
Chaffee County11049612
Cheyenne County245102
Clear Creek County5151484
Conejos County3810272
Costilla County2617173
Crowley County11630
Custer County151661
Delta County10150712
Denver County1,6937021,47263
Dolores County2010150
Douglas County2472451578
Eagle County164123974
El Paso County1,05774578022
Elbert County3928251
Fremont County12769685
Garfield County1731421285
Gilpin County168110
Grand County13374713
Gunnison County9043431
Hinsdale County141050
Huerfano County5119256
Jackson County24590
Jefferson County84762381765
Kiowa County171240
Kit Carson County8450300
La Plata County17385872
Lake County4128201
Larimer County52734444121
Las Animas County7429373
Lincoln County6139456
Logan County11943698
Mesa County38022428029
Mineral County8541
Moffat County7228443
Montezuma County12071605
Montrose County126626610
Morgan County137681015
Otero County10041474
Ouray County241670
Park County4423221
Phillips County3724140
Pitkin County9068633
Prowers County6839351
Pueblo County38724028214
Rio Blanco County6425340
Rio Grande County7534402
Routt County11366785
Saguache County3115151
San Juan County11370
San Miguel County3615131
Sedgwick County328272
Summit County91100947
Teller County4746353
Washington County5922110
Weld County59536535815
Yuma County7728330

Frequently asked questions

How many underground storage tanks are in Colorado?

The EPA UST Finder snapshot lists 11,328 registered UST facilities in Colorado, with 6,985 tanks in service and 24,228 closed or removed tanks across 64 countys.

How many tank leaks have been reported in Colorado?

8,481 releases are on record statewide. 7,970 (94%) were closed with No Further Action; 493 cleanup cases remained open in the snapshot.

Which Colorado county has the most underground storage tanks?

By facility count: Denver (1,693), El Paso (1,057), Adams (880), Jefferson (847), Arapahoe (803). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.