State file — MT

Underground storage tanks in Montana

6,136 registered facilities · 3,275 tanks in service · 4,844 leak records · 1,027 open cleanup cases (EPA UST Finder snapshot, 2018–2021 state data).

6,136UST facilities

3,275tanks in service

13,611closed tanks

4,844leak records

1,027open cases

76%cases closed / NFA

Montana runs 30.9 tanks in service per 10,000 residents (population 1,059,459). 3,667 of its 4,844 reported releases have reached No Further Action. The regulator of record is the Montana DEQ UST Program, which holds the live registration and case files.

Check any Montana address

Free screening of every registered tank and reported leak within a mile of any address.

Screen an address

By county

County	Facilities	Tanks in service	Leak records	Open cases
Beaverhead County	79	45	80	6
Big Horn County	137	78	112	30
Blaine County	66	32	48	16
Broadwater County	54	25	45	11
Carbon County	74	28	57	10
Carter County	19	9	13	7
Cascade County	360	229	323	83
Chouteau County	121	30	63	15
Custer County	78	47	72	27
Daniels County	38	8	35	3
Dawson County	85	37	87	33
Deer Lodge County	65	19	32	3
Fallon County	43	22	26	9
Fergus County	166	106	113	22
Flathead County	314	239	273	63
Gallatin County	302	221	222	18
Garfield County	17	6	12	4
Glacier County	155	75	122	26
Golden Valley County	9	0	8	1
Granite County	37	12	26	4
Hill County	153	42	130	47
Jefferson County	54	28	60	7
Judith Basin County	62	38	43	7
Lake County	224	152	200	36
Lewis and Clark County	283	140	236	52
Liberty County	36	9	22	6
Lincoln County	134	78	148	6
Madison County	78	35	73	14
McCone County	32	21	19	3
Meagher County	27	11	18	6
Mineral County	57	33	57	1
Missoula County	403	269	314	22
Musselshell County	46	15	26	5
Park County	148	64	99	6
Petroleum County	9	0	8	3
Phillips County	61	29	40	18
Pondera County	108	25	71	16
Powder River County	24	12	27	8
Powell County	58	19	34	2
Prairie County	21	6	22	6
Ravalli County	103	63	80	0
Richland County	112	46	66	16
Roosevelt County	184	77	129	37
Rosebud County	79	37	86	34
Sanders County	116	45	89	6
Sheridan County	89	24	48	4
Silver Bow County	176	115	97	25
Stillwater County	51	41	56	16
Sweet Grass County	39	15	33	2
Teton County	89	44	50	10
Toole County	99	26	68	14
Treasure County	17	5	10	4
Valley County	143	39	110	36
Wheatland County	54	31	26	9
Wibaux County	8	12	8	1
Yellowstone County	540	361	472	151

Frequently asked questions

How many underground storage tanks are in Montana?

The EPA UST Finder snapshot lists 6,136 registered UST facilities in Montana, with 3,275 tanks in service and 13,611 closed or removed tanks across 56 countys.

How many tank leaks have been reported in Montana?

4,844 releases are on record statewide. 3,667 (76%) were closed with No Further Action; 1,027 cleanup cases remained open in the snapshot.

Which Montana county has the most underground storage tanks?

By facility count: Yellowstone (540), Missoula (403), Cascade (360), Flathead (314), Gallatin (302). Use the county pages for tank and leak detail, or screen any specific address free at https://tankcheckusa.site/.