How deep are wells in Oklahoma? Depth by county from 93,531 state well logs

Deepest and shallowest counties by median depth

Among the 77 counties with 30 or more logs that give a depth. The logs column is the count behind each median.

Every Oklahoma county with 30 or more logs

Depth is the total depth the driller reported. "Middle 80%" is the 10th to 90th percentile: one log in ten is shallower than the first number and one in ten deeper than the second. Water first found is the median depth where water was first found while drilling, from the logs that record one. Years: the span of the middle 90% of dated logs. Download the table (CSV).

Method

• Source: the Oklahoma Water Resources Board, Groundwater Wells layer (multipurpose well completion reports). We downloaded it on October 10, 2026 from the state's own server.
• Rows counted: domestic (household) water wells. Field filter as run: USE_CLASS = Domestic; depth = TOTAL_DPTH; level = FIRST_WTR (depth to first water while drilling).
• Each log is placed in the county the state file gives, matched to Census county names. 93,531 logs matched a Oklahoma county.
• A depth outside 1 to 5,000 feet is treated as a typing error and left out. A water level counts only when it is above zero and shallower than the well's depth. Medians and percentiles use the standard linear method.
• A county shows figures only with 30 or more logs that give a depth (water level: 30 or more levels). Nothing is estimated or filled in.

Limits

• Well logs cover drilled wells that a driller reported to the state. They are not a count of every well: older wells, hand-dug wells and wells from before reporting began are often missing.
• Depths and water levels are as each driller wrote them on the day the well was finished. Water levels move with season, drought and nearby pumping, so an old reading is not today's level.
• Dates vary by county. The years column shows when most of the logs were drilled; a county with mostly older logs describes older wells.
• A county figure says nothing certain about one lot. Depth can change a lot across a county, from hilltop to valley. A local driller's logs for nearby wells are the better guide for a single property.
• Oklahoma's public file records the depth where water was first found while drilling, not a static water level, so the two are not comparable with other states.

Data: Oklahoma Water Resources Board, Groundwater Wells layer (multipurpose well completion reports), read October 10, 2026. CSV of this table. Built by WellsNear from the state file; the code is the same for every state.

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