MERCER COUNTY, PENNSYLVANIA · 17 MIN FROM OUR GREENVILLE OFFICE
Most of a Clark-area well is drilled in rock. The median well runs 100 feet, but rock sits a median 20 feet down in the 400 logs that record it, and a quarter reached it by 12. That keeps casing short on many wells and puts most of the footage into open hole in rock.
Serving our communities since 1967
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WHAT WE DO IN CLARK
Whether you’re on a private well or city water, the same crew handles the water source, the pressure, and what comes out of the tap.
Hardness is common in Mercer County wells: the USGS record puts the median at 7.6 grains per gallon, with 59% of 102 sampled wells hard or very hard. A water test tells a household whether a LuxSoft softener, iron treatment or neither is needed.
Clark wells run deeper than most in Mercer County, tied for 5th of 15 towns by median depth, and a quarter of the 761 logs went to 132 feet or more. The rock mapped at the town center is Mississippian siltstone, shale and sandstone.
Yields are solid: a median of 20 gallons a minute across 641 logs, with a quarter at 30 or more. Most wells can run a full-size submersible, and many suit constant pressure. The bottom quarter, at 10 or less, gets sized with more care.
WELLS AROUND CLARK
The 761 domestic wells on file within 5 miles of Clark, from the state’s drilling logs: your neighbors’ wells, and the best guide to this ground.
middle half 80–132 ft
middle half 10–30 gpm
middle half 12–33 ft
PaGWIS records
Source: PaGWIS (PA DCNR), domestic wells within 5 miles, retrieved 2026-09-30; older paper-record locations are approximate.
Casing usually runs from the surface down to rock, and around Clark rock comes up fast: 12 feet or less in a quarter of the logs and 33 or more in only a quarter. With the median well at 100 feet, most of a typical hole is open rock below the casing. The rock mapped at the town center is the Cuyahoga Group's siltstone, shale and sandstone.
That shapes the job. A short run of steel is set and seated in rock, then the driller keeps going until the hole gives enough water. Three in four logged wells here went at least 80 feet. Residential well drilling covers the process with PA DEP permit assistance, and what a new well costs explains how footage adds up.
Half of the 641 logs that record a yield fall between 10 and 30 gallons a minute. A well in the upper half can usually run a standard submersible pump without drawing itself down, and a constant-pressure system, which holds pressure steady as taps open and close, becomes a practical upgrade. A quarter of logs reach 30 gallons a minute or more, where the house rather than the well sets the size of the pump.
A well in the bottom quarter can still serve a house; its pump is matched to the tested flow, with a pressure tank sized to limit pump starts. When pressure drops on a strong well, the pump, switch or tank is the usual suspect, and emergency pump repair sorts out which.
WATER IN MERCER COUNTY
In USGS samples from across Mercer County, taken 1928–2023, 59% of wells were hard or very hard, 58% carried iron above the staining line, 54% had manganese above 0.05 mg/L. The full record, and what it means for treatment, is on the Mercer County page; your own well gets its own test.
WHY CLARK CHOOSES CHATFIELD
Rated 4.7 on Google across 104 reviews. Here is what working with us looks like, in a customer’s words.
“We bought a new home November 1st, 2024 and low and behold it had a collapsed well. After several quotes, we chose Chatfield drilling, and we’re glad we did! Matt & his team arrived quickly to assess the situation, and formulate a plan to get the H2O flowing again. Even through the holidays, they did not waiver. Eric their driller worked hard in the brutal NE Ohio cold to pound a well for us. We are beyond pleased, and have fantastic water!”
NEARBY
We send the same crews to each of these towns. If you’re between towns, pick the closest one; the service doesn’t change.
A LITTLE CLARITY
Our Greenville office (854 Mercer Rd., Greenville, PA 16125) is about 17 minutes and 9 miles by road from Clark. Service calls for Clark are scheduled from there.
Clark and the municipalities around it: Pymatuning Township, South Pymatuning Township, Sharpsville, Hermitage, Sharon, Jefferson Township, Delaware Township, Farrell, Orangeville, Yankee Lake. Beyond those, the rest of the 15 Mercer County communities on our service map, from the same office.
Pennsylvania’s groundwater database (PaGWIS) lists 761 domestic wells within 5 miles of Clark: the median is 100 feet deep, and the middle half fall between 80 and 132 feet. The median well was logged at 20 gallons per minute. Drillers reached bedrock at a median of 20 feet. Your own well's depth depends on the ground under your lot.
Because the goal is enough water, and reaching rock doesn't guarantee that. Casing stops at rock, and the hole continues until it yields what the house needs. Around Clark rock is a median 20 feet down while the median finished well is 100 feet, so most of the drilling happens below the casing. The flow test at the end confirms the yield.
It's common in the county. Mercer County's USGS record found iron above the 0.3 mg/L staining line in 58% of 99 sampled wells, with a median of 0.45 mg/L, and manganese above 0.05 mg/L in 54% of 93. A water test, on site or through a certified lab, shows your well's levels, and a FerronX Iron System handles both metals.
Talk with the Chatfield team.
(724) 588-2652A LITTLE KNOWLEDGE GOES A LONG WAY
WATER TESTINGWhat a test measures, what the results mean, and what happens next.
WELL DRILLINGWhat drives the price of drilling a well in our region, and what to ask before you sign.
WATER PROBLEMSIron and manganese in well water: what causes it and how a test confirms it.
YOUR NEXT STEP
Tell us what you’re noticing. We’ll come out from Greenville, test your water, and walk you through the next step.