⟁ Montana Well Data field records · 2026 survey

Montana Well Data › Petroleum County

Petroleum County, Montana: well depth, water level & drilling cost

✓ 777 GWIC records · verified 2026-06-10

160 ftmedian well depth
36 ft–1,042 fttypical depth range
34 ftmedian static water level
10 gpmmedian yield (484 tests)

How deep are wells in Petroleum County, Montana?

The median drilled well depth in Petroleum County is 160 ft, based on 672 wells with recorded depths in the state GWIC database. Half of all wells fall between 36 ft and 1,042 ft; 90% are shallower than 1,525 ft. Wells drilled since 2016 have a median depth of 260 ft.

How much does it cost to drill a well in Petroleum County?

Applying published per-foot rates to the local median depth of 260 ft: drilling and casing alone typically runs $6,500–$16,900; a complete system including pump, pressure tank, and hookup typically runs $15,600–$28,600. Actual quotes depend on site access, geology, and casing requirements.

What is the static water level in Petroleum County?

The median static water level is 34 ft below ground surface (middle half of wells: 13 ft–90 ft), from 320 measurements.

How much water do wells in Petroleum County produce?

The median tested yield is 10 gpm (middle half: 5 gpm–20 gpm), from 484 pump tests. A typical household needs 5–10 gpm.

Drilled depth distribution

0–50 ft 186 50–100 ft 54 100–150 ft 74 150–200 ft 59 200–300 ft 56 300–400 ft 14 400–600 ft 9 600+ ft 220

Who drills wells in Petroleum County?

Companies by number of wells completed in this county since 2016, per filed well logs.

Drilling companyWells since 2016
CENTRAL DRILLING INC11
HOLE WORLD CONSULTING LLC5
GORDON DRILLING INC4
HAZ TECH DRILLING INC4
VIDIC DRILLING INC3
OLYMPUS TECHNICAL SERVICES3
SINGLEY DRILLING2
AQUASOURCE DRILLING LLC1

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Method: medians computed from GWIC records (site type WELL, non-abandoned; depths 0–5,000 ft). Cost estimate applies published per-foot ranges (checked 2026-06-10) to the local median depth — full methodology & sources.