⟁ Texas Water Well Reports field records · 2026 survey

Texas Water Well Reports › Hays County › San Marcos (78666)

San Marcos, TX (78666): well depth, water level & drilling cost

✓ 464 TDLR SDR records · Hays County

560 ftmedian well depth
340 ft–820 fttypical depth range
255 ftmedian static water level
10 gpmmedian yield (361 tests)

How deep are wells in San Marcos (78666), Texas?

The median drilled well depth in San Marcos (78666) is 560 ft, based on 463 wells with recorded depths in the state TDLR SDR database. Half fall between 340 ft and 820 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 580 ft: drilling and casing alone typically runs $14,500–$37,700; a complete system including pump, pressure tank, and hookup typically runs $34,800–$58,000. 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 255 ft below ground surface (middle half of wells: 180 ft–320 ft), from 427 measurements.

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Drilled depth distribution

0–50 ft 6 50–100 ft 3 100–150 ft 5 150–200 ft 7 200–300 ft 47 300–400 ft 84 400–600 ft 98 600+ ft 213
Looking at a specific property in San Marcos (78666)?

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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.