Water Well Services Across North Texas

Collin County sits over the Woodbine aquifer (confined). Residential well depth varies across the county. Woodbine outcrop in central and eastern Collin County; Trinity beneath at depth.

Cooke County sits over the Trinity (Antlers) aquifer (outcrop / subcrop). Residential well depth varies across the county. Reddish Antlers arkosic sand — Paluxy and Twin Mountains coalesce here because the Glen Rose Limestone is absent.

Dallas County sits over the Trinity (deep, confined) aquifer (deep, confined, downdip). Residential well depth varies across the county. Thick black Blackland clay and deep Austin Chalk; both Trinity and Woodbine are buried far below typical residential drilling depths.

Denton County sits over the Trinity (Paluxy / Glen Rose / Twin Mountains; Antlers in northern Denton County) aquifer (confined; outcrop in far western Denton County). Residential well depth varies across the county. East/west aquifer split — Woodbine in eastern Denton County, Trinity (Paluxy/Glen Rose/Twin Mountains) in western and central Denton County, with the Glen Rose pinching out northward into an Antlers coalescence.

Ellis County sits over the Woodbine aquifer (deep confined subcrop; ~100–1,400 ft beneath Ellis County). Residential well depth varies across the county. Ellis County is largely downdip from the Trinity outcrop. Austin Chalk and Eagle Ford form regional confining cover; the Woodbine subcrop is the primary residential target at ~100–1,400 ft (SSC-area literature 600–1,000 ft); the deeper Trinity (Hosston/Twin Mountains) sits at ~2,000–3,000 ft.

Erath County sits over the Trinity aquifer (outcrop / near-outcrop transition county). Residential well depth varies across the county. Trinity outcrop / near-outcrop county; the TWDB/MTGCD monitor well south of Stephenville (Well 3155504) is the only verified depth anchor at 332 ft (Twin Mountains, unconfined).

Fannin County sits over the Woodbine aquifer (outcrop band roughly parallel to the Red River; dips eastward to ~1,200 ft top near the eastern Fannin County line). Residential well depth varies across the county. Rust-tinted Woodbine sand signals elevated iron; outcrop band runs roughly parallel to the Red River across the county.

Grayson County sits over the Woodbine aquifer (outcrop in a NE-SW band through central and eastern Grayson County; dips eastward into Fannin/Lamar/Red River counties). Residential well depth varies across the county. Green-gray glauconitic Woodbine sandstone; Glen Rose Limestone is absent and the Paluxy/Twin Mountains coalesce into the Antlers Formation.

Hood County sits over the Trinity (Paluxy / Glen Rose / Twin Mountains) aquifer (outcrop / shallow confined). Residential well depth varies across the county. Glen Rose limestone ledges (stepped, fossil-bearing); the Paluxy/Glen Rose/Twin Mountains stack remains distinguishable in most of Hood County.

Hunt County sits over the Nacatoch Sand aquifer (minor outcrop aquifer — outcrops in a belt from north of Commerce SW through Cash, dips to the SE). Residential wells typically run 300–650 ft. Nacatoch Sand at ~300–650 ft is the principal aquifer; Blackland margin clays and Navarro Group marls overlie it.

Johnson County sits over the Trinity (Paluxy / Glen Rose / Hensell / Hosston) aquifer (outcrop/shallow subcrop in western Johnson County; deep confined beneath Eagle Ford/Austin Chalk in eastern Johnson County). Residential well depth varies across the county. East/west split — western Johnson County Trinity outcrop/shallow subcrop, eastern Johnson County Trinity beneath Eagle Ford/Austin Chalk confining cover.

Kaufman County sits over the Limited groundwater — three distinct scenarios aquifer (no single countywide aquifer; alluvium where present, deep Woodbine in western Kaufman County only, and deep brackish Trinity). Residential well depth varies across the county. Heavy black Blackland (Houston Black) clay at surface, thick Austin Chalk beneath, and aquifer targets that are either localized alluvium, deep western Woodbine, or unreachable Trinity.

Navarro County sits over the Nacatoch Sand aquifer (outcrop across central and eastern Navarro County; dips SE at roughly 40–100 ft/mile). Residential wells typically run 100–800 ft. Nacatoch Sand is the principal aquifer; depth varies sharply with location (~100 ft near outcrop to ~800 ft farther SE). Corsicana is the type locality for the Navarro Group itself.

Palo Pinto County sits over the Cross Timbers Aquifer (Pennsylvanian) aquifer (Pennsylvanian bedrock; water in fractures and localized sand and limestone lenses). Residential wells typically run 100–450 ft. Pennsylvanian Cross Timbers bedrock — older than the Cretaceous formations everywhere else in the service area; water is fracture- and lens-controlled, not a single continuous sand.

Parker County sits over the Trinity (Paluxy / Twin Mountains) aquifer (outcrop in central and western Parker County; confined beneath younger limestone in eastern Parker County). Residential wells typically run 250–550 ft. Aquifer band sits high in cube — visual signature of Trinity outcrop.

Rockwall County sits over the Woodbine (subsurface) aquifer (deep, downdip, brackish — not a practical residential target; TWDB modeled-available-groundwater value is zero acre-feet/yr for 2020–2080). Residential well depth varies across the county. Densest black vertisol topsoil in the service area, but no practical residential aquifer — both Woodbine and Trinity are deep, downdip, and brackish, with state planning values at zero.

Somervell County sits over the Trinity (Glen Rose / Paluxy / basal Trinity sands — Hensell/Hosston PGCD planning names) aquifer (outcrop — very shallow in places). Residential well depth varies across the county. Pale fossiliferous Glen Rose limestone at the very surface — Somervell County is the global type locality for the Glen Rose Formation.

Tarrant County sits over the Trinity (Paluxy / Twin Mountains, separated by Glen Rose confining unit) aquifer (deep confined across most of Tarrant County; limited Trinity outcrop in the far northwestern corner). Residential well depth varies across the county. Pink granite courthouse is the most architecturally distinctive; depth conveys urban-fringe drilling effort. Paluxy and Twin Mountains depths increase generally from west to east following the regional structural dip.

Wise County sits over the Trinity (Antlers — Paluxy/Twin Mountains coalescence in central/northern Wise County; Paluxy/Glen Rose/Twin Mountains stack in southern Wise County) aquifer (outcrop / shallow confined — Wise County sits on the geological boundary line where the Glen Rose Formation thins to extinction). Residential well depth varies across the county. Wise County is the literal geological boundary county — the Glen Rose Formation pinches out approximately mid-county. North and west of that line, the Paluxy and Twin Mountains formations coalesce into a single sandstone unit (the Antlers Formation). The cube shows this simplification: fewer intervening limestone layers than Hood or Parker counties, with a thicker continuous sandstone aquifer body.