Water may appear completely clear and still contain contaminants that cannot be seen, smelled, or tasted. For buyers purchasing a home with a private well, this is not a theoretical concern—it is a practical one that deserves attention before closing.

Unlike a public water system, where water quality is routinely monitored by the water supplier, a private well serves an individual property. Understanding the quality of that water can therefore be an important part of a buyer's due diligence.

Testing Is Often Recommended When:

  • A home uses a private well as its water source
  • Financing or lender requirements include water quality testing
  • The water quality history of the property is unknown
  • The well has not been tested recently
  • The property is located near agricultural activity or other potential sources of contamination
  • The buyer wants additional information about the home's drinking water before purchase

Common Testing May Include:

  • Total coliform and E. coli bacteria — commonly used as indicators of possible bacterial contamination
  • Nitrates and nitrites — particularly relevant in areas with agricultural activity, fertilizers, or certain onsite sewage conditions
  • Additional parameters — testing can be expanded based on the property's location, local conditions, lender requirements, or the buyer's concerns

The specific tests appropriate for a property can vary. A basic water quality test does not necessarily evaluate every possible contaminant that could be present in well water.

Why Private Well Water Deserves Attention

For many rural properties in Central Pennsylvania, water testing is an important component of the home-buying process. Agricultural activity, older well construction, nearby septic systems, and surrounding land uses can influence groundwater quality in ways that are impossible to determine simply by looking at the water.

Even water that looks clear, smells normal, and tastes fine can contain contaminants. That's why visual observation alone cannot determine whether well water meets appropriate water quality standards.

What Happens If a Water Test Identifies a Problem?

An unfavorable water test does not automatically mean a buyer should walk away from the property.

Depending on what is identified, water quality concerns can often be addressed through treatment, filtration, disinfection, well maintenance, or other corrective measures. The appropriate response depends on the contaminant and the circumstances surrounding the well.

The important part is discovering the condition before closing, when the buyer still has an opportunity to understand the issue, obtain additional information, discuss possible corrective measures, and make an informed decision.

Knowledge Before Closing

A home inspection can tell you a great deal about a property, but you cannot determine water quality by inspecting a faucet or looking into a glass of water.

For homes served by a private well, laboratory testing provides information that a visual inspection simply cannot.

Test before you assume. Know before you close.