Dallardsville Quad
Texas Water Development Board
Located in Polk County, Texas, this groundwater monitoring location is associated with a water well in the Coastal lowlands aquifer system.
Well Construction
| Depth | Description | |
|---|---|---|
| 0.0-635.0 ft | steel casing | |
| 485.0-635.0 ft | steel casing | |
| 635.0-665.0 ft | stainless steel screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-10.0 ft | - | Surface |
| 10.0-40.0 ft | - | Clay (Brown) |
| 40.0-60.0 ft | - | Sand (Brown) |
| 60.0-165.0 ft | - | Shale (Brown) |
| 165.0-268.0 ft | - | Sand |
| 268.0-290.0 ft | - | Shale (Brown) |
| 290.0-306.0 ft | - | Sand |
| 306.0-315.0 ft | - | Shale |
| 315.0-334.0 ft | - | Sand |
| 334.0-390.0 ft | - | Shale (Blue) |
| 390.0-415.0 ft | - | Sand (Salt & Pepper) |
| 415.0-520.0 ft | - | Shale (Blue) |
| 520.0-562.0 ft | - | Sand (Salt & Pepper) |
| 562.0-635.0 ft | - | Shale (Blue) |
| 635.0-665.0 ft | - | Sand |
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Agency Texas Water Development Board Site Name Dallardsville Quad Site Number 6119417 Site Type WELL Lat/Long (NAD83) 30.6929, -94.7463 Well Depth 665 Feet Elevation (NAVD88) 369.0 ft Latitude 30.6929417 Longitude -94.7462667 Local Aquifer Name Gulf Coast (122BKVL) (None) National Aquifer Name Coastal lowlands aquifer system (S100CSLLWD) Aquifer Type CONFINED Water-Level Well Type Trend Water-Level Well Characteristics Suspected / Anticipated Changes Water Quality Network Additional info Link 1 -
Activity Start Date Activity Start Time Characteristic Name Measure Value Units Detection Limit Value Type Sample Fraction Method Name Analytical Method System Sample Method ID Sample Method ID Context Sample Method Name Activity Type Code Data Provided By -
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How do we calculate statistics?
Overall Water Level Statistics (Depth to water, feet below land surface) Lowest Water Level Median Water Level Highest Water Level First Measurement Date Last Measurement Date Number of Measurements Years of Record Latest Value Latest Percentile 192.00 189.80 187.77 2013-08-15 2025-12-31 1891 12.3 191.63 0.0 Statistics Calculated 2026-01-20 Monthly Water Level Statistics (Depth to water, feet below land surface) Month Lowest Median 10th Percentile 25th Percentile 50th Percentile 75th Percentile 90th Percentile Highest Median Number of Measurements Years of Record Jan 190.99 190.82 190.22 189.78 188.67 188.36 188.32 12 12 Feb 190.77 190.61 190.17 189.49 188.51 188.09 188.04 12 12 Mar 190.53 190.44 190.02 189.40 188.56 188.06 187.90 12 12 Apr 190.32 190.31 190.17 189.31 188.64 188.08 187.95 12 12 May 190.69 190.57 190.17 189.29 188.57 188.17 188.11 12 12 Jun 190.87 190.78 190.11 189.50 188.76 188.32 188.28 12 12 Jul 191.18 191.10 190.55 189.68 189.08 188.47 188.34 12 12 Aug 191.51 191.42 190.96 190.16 189.39 189.01 188.98 11 11 Sep 191.51 191.46 191.10 190.06 189.46 189.12 189.06 12 12 Oct 191.85 191.74 191.11 190.25 189.29 189.05 189.02 12 12 Nov 191.86 191.81 190.68 190.21 189.18 188.92 188.87 12 12 Dec 191.63 191.58 190.45 190.14 189.12 188.60 188.52 12 12 Statistics Calculated 2026-01-20 -
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