Trumbull County’s 23 mapped town centers sit on four different bedrock units, but the well logs read fairly even: every town’s median yield falls between 12 and 20 gallons a minute, and most median wells are 85 to 109 feet deep.
Four rock units under 23 towns
The rock mapped at the town centers splits four ways. The Maxville Limestone with the Rushville, Logan and Cuyahoga Formations is under 9, Warren, Cortland, Niles and Girard among them. The Allegheny and Pottsville Groups are under 7, including Brookfield, Hubbard, Newton Falls and Vienna. Ohio Shale is mapped at 5: Kinsman, Mesopotamia, North Bloomfield, Southington and West Farmington. Bristolville and Farmdale sit on Berea Sandstone and Bedford Shale.
Depth to rock in the logs ranges more widely than yield. Near Orangeville the median is 16 feet; near Southington it is 60, and near West Farmington 46. Most towns fall between 18 and 37 feet. A residential well is planned from the logs nearest the site, and we drill geotechnical and environmental wells in the county as well.
Yields of 12 to 20 gallons a minute
The logs near Cortland, Farmdale and Kinsman give the best median yield on the county map, 20 gallons a minute. Several towns, Brookfield, Girard and Masury among them, sit at the low end, 12. Most of the rest are at 14 or 15.
Median depth runs from 109 feet at West Farmington and 108 at Hubbard and Southington down to 81 at Farmdale and 68 at North Bloomfield. Water stands a median 12 feet below ground near North Bloomfield and 31 near West Farmington, with most towns in between at 20 to 30. Depth and water level help decide where a submersible pump is set, and yield guides its size and the pressure tank that goes with it.
Where the mapped systems get water
EPA’s map places 11 of the 23 towns in a public system, and only three of those systems make their own water. Warren City draws from Mosquito Reservoir and serves 49,130 people. Newton Falls takes water from the East Branch of the Mahoning. Cortland pumps groundwater from 7 active wells.
The other eight buy it. Niles buys from the Mahoning Valley Sanitary District, as does McDonald’s village system. Vienna’s Southeast system buys from Niles, Mineral Ridge from Youngstown and Niles, and Girard from four suppliers. Hubbard buys from Aqua Ohio - Masury, Leavittsburg’s township system from Warren, and West Farmington from the Braceville Township system. Brookfield, Kinsman, Southington and the other towns show no system on the map, which doesn’t mean every home there is on a well. The USGS county record adds only pH, from 24 wells; the Trumbull County water treatment page picks that up.
Source: Water quality: USGS National Water Information System results for Trumbull County wells, served through the Water Quality Portal, sampled between 1997 and 2013, retrieved 2026-09-14. Each well counts once, as the median of its samples. The 0.3 mg/L iron and 0.05 mg/L manganese marks are EPA secondary standards, which are aesthetic limits, not health limits. Well depth: Ohio Department of Natural Resources well-log database, 8,197 domestic wells in Trumbull County with a recorded depth, logged between 1924 and 2026, retrieved 2026-09-14.