If you’re a homeowner in Mercer County, PA considering a new well or wondering how your existing well works, you’re not alone. Well drilling can feel like a complicated process — but it doesn’t have to be. Below, we’ve answered the most common questions we hear from homeowners across Mercer County and the surrounding Western Pennsylvania region, including Mercer, Grove City, Sharon, Hermitage, and Greenville.
How deep is a typical well in Mercer County, PA?
Most residential wells drilled in Mercer County range from 100 to 400 feet deep, though depths can vary significantly depending on local geology. Mercer County sits on a mix of glacial deposits and sedimentary bedrock, which affects where water-bearing rock formations (aquifers) are found. In some areas, reliable water is found at 150 feet; in others, drillers may need to go 300 feet or deeper to reach a sufficient yield. During a site assessment, Chatfield Drilling evaluates your land’s geology and neighboring well records to help estimate the likely depth before drilling begins.
How long does well drilling take from start to finish?
For a typical residential well in Mercer County, the actual drilling process takes one to three days depending on depth, rock conditions, and required equipment. However, the full timeline from first contact to a finished, operational well — including site assessment, permitting, drilling, casing installation, pump installation, and water testing — generally runs two to four weeks. Permit processing through the Pennsylvania Department of Environmental Protection (PA DEP) typically adds several business days. Chatfield Drilling manages the entire process, so you won’t have to coordinate multiple contractors or navigate permitting on your own.
What permits are required to drill a well in Pennsylvania?
In Pennsylvania, a water well must be permitted under the Pennsylvania Water Well Drillers License Act and comply with regulations administered by the PA DEP. A licensed well driller — like Chatfield Drilling — must pull the permit before any drilling begins. The permit application requires site information including property location, intended use, and setback distances from septic systems, property lines, and other potential contamination sources. PA DEP mandates minimum setbacks: 50 feet from a septic tank, 100 feet from a drain field, and 100 feet from any fuel storage. Chatfield handles all permitting as part of every new well project.
How much does a new residential well cost in Mercer County?
The cost of drilling a new residential well in Mercer County typically ranges from $5,000 to $15,000 or more, depending on well depth, local rock conditions, casing materials, and the pump system you choose. Deeper wells in hard bedrock cost more to drill than shallower wells in softer formations. Pump installation, pressure tank, electrical connections, and the wellhead are additional line items. After drilling, a water quality test — which Chatfield Drilling offers free of charge — is strongly recommended before you connect to your home’s plumbing. Contact us for a site-specific estimate.
How long does a residential well last?
A properly drilled and maintained residential well can last 30 to 50 years or longer. The well casing itself — typically steel or PVC — has a long lifespan when correctly installed and grouted to prevent surface water infiltration. The well pump, however, has a shorter life: submersible pumps generally last 10 to 15 years depending on usage, water quality, and maintenance. In Mercer County’s iron-rich groundwater environment, sediment and mineral buildup can shorten pump life if a water treatment system is not installed. Annual well inspections and periodic water testing help catch problems early and extend the life of your entire system.
Do I need a water test after drilling a new well?
Yes — water testing after drilling a new well is not just recommended, it’s essential. Newly drilled wells can contain drilling debris, sediment, and surface bacteria that need to clear before the water is safe to use. PA DEP strongly recommends testing for coliform bacteria, nitrates, and pH at minimum after a new well is completed. Depending on your location and local land use, testing for iron, manganese, arsenic, hardness, and other parameters may also be advisable. Chatfield Drilling offers a free water test with every new well installation and can recommend an appropriate water treatment system if any contaminants are detected.
What’s the difference between a drilled well and a dug well?
A drilled well is bored deep into bedrock or sand-and-gravel aquifers using rotary drilling equipment, then lined with a steel or PVC casing to keep the borehole open and exclude surface contaminants. Drilled wells in Mercer County typically go 100 to 400+ feet deep and are the modern standard for new residential construction. A dug well, by contrast, is excavated by hand or with a backhoe to a shallow depth — usually less than 30 feet — and relies on groundwater seeping in from surrounding soil. Dug wells are far more vulnerable to surface contamination (bacteria, pesticides, runoff) and can go dry during droughts. Most dug wells in Western PA are old construction and are being replaced by drilled wells for safety and reliability.
Can I drill a well anywhere on my property?
Not necessarily. Pennsylvania law requires minimum setback distances between a well and potential sources of contamination. A new well must be at least 50 feet from a septic tank, 100 feet from a drain field or leach bed, and a safe distance from fuel storage tanks, animal pens, and property boundaries. Your property must also have enough accessible land area for the drill rig to operate safely. In some cases, rock formations, underground utilities, or terrain features can limit drilling locations. Chatfield Drilling performs a thorough site assessment before committing to a drilling location, reviewing local geology, neighboring well records, and all applicable PA DEP setback requirements to find the best and safest spot on your property.
Need Help? Contact Chatfield Drilling
Chatfield Drilling has been serving Mercer County and Western Pennsylvania for decades. Whether you need a new residential well drilled, a pump replaced, or a free water quality test, our licensed team is ready to help. We serve homeowners throughout Mercer, Lawrence, Crawford, Erie, Venango, and Butler counties in Pennsylvania, as well as Mahoning, Trumbull, Columbiana, and Ashtabula counties in Ohio. Call us at (724) 588-2652 or contact us online to schedule a free consultation.
