Texas Water Well Reports › Hays County › San Marcos (78666)
San Marcos, TX (78666): well depth, water level & drilling cost
✓ 494 TDLR SDR records · Hays County
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How deep are wells in San Marcos (78666), Texas?
The median drilled well depth in San Marcos (78666) is 570 ft, based on 493 wells with recorded depths in the state TDLR SDR database. Half fall between 340 ft and 810 ft; 90% are shallower than 960 ft.
How much does it cost to drill a well in San Marcos (78666)?
Applying published per-foot rates to the local median depth of 570 ft: drilling and casing alone typically runs $14,250–$37,050; a complete system including pump, pressure tank, and hookup typically runs $34,200–$57,000. Actual quotes depend on site access, geology, and casing requirements.
What is the static water level in San Marcos (78666)?
The median static water level is 260 ft below ground surface (middle half of wells: 180 ft–320 ft), from 453 measurements.
Drilled depth distribution
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Part of Hays County well records.
Method: medians computed from TDLR SDR records (water-supply wells only (domestic, irrigation, stock, public supply, industrial) — monitoring, environmental borings, test holes, injection and geothermal excluded; depths 0–5,000 ft), grouped by ZIP from the recorded address. Cost estimate applies published per-foot ranges to the local median depth — full methodology & sources.