Nineteen of Mahoning County’s 21 mapped town centers sit on the same rock, the Allegheny and Pottsville Groups, and only six of the 21 towns fall inside a public water system on EPA’s map.
One rock unit, nineteen town centers
The Allegheny and Pottsville Groups are mapped at every town center on the county map but two: Lowellville and Youngstown, which sit on the Maxville Limestone with the Rushville, Logan and Cuyahoga Formations. Yields are just as even. Most towns have a median of 15 gallons a minute; Beloit, North Benton, Petersburg and Sebring are at 12, and New Middletown at 13.
Depth to rock varies more. The median is 21 feet near Austintown and 25 near North Jackson and Youngstown, against 57 near Damascus, 53 near Sebring and 52 near Beloit. Where rock sits deeper, more of the hole runs through soil and loose material before the drill reaches it, which affects how much casing a residential well needs.
Deepest wells at Sebring and Beloit
Wells near Sebring run deepest on the county map, a median 140 feet in the logs, then Beloit at 136 and North Benton at 130. The shallowest are Lowellville at 105 and Austintown and Youngstown at 102. Water stands a median 25 to 37 feet below ground across the towns, deepest near Sebring, and 30 feet or more near most of them.
At these depths a submersible pump is the standard choice, set well below the water level, and the cost of a new well rises with depth. Where an older well has lost flow or pressure, a well inspection comes before any decision to drill again.
Six towns on three mapped systems
Three public systems cover those six towns. The largest, Youngstown City at 130,530 people, is mapped at Youngstown, Austintown and Boardman, and its water is bought from the Mahoning Valley Sanitary District. Canfield’s city system buys from Youngstown. Sebring Village takes its own water from the Mahoning River and is mapped at Sebring and Beloit.
The rest of the towns, from Berlin Center and Campbell to Poland and Struthers, show no system on the map. That reflects the map, not a finding that every home there is on a well. The county’s USGS record for well chemistry is thin as well: hardness from 5 wells, pH from 7, and nothing on iron or manganese. The Mahoning County water treatment page sets out what that leaves to a test.
Source: Water quality: USGS National Water Information System results for Mahoning County wells, served through the Water Quality Portal, sampled between 1978 and 2001, 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, 10,739 domestic wells in Mahoning County with a recorded depth, logged between 1935 and 2026, retrieved 2026-09-14.