Baseline Water Quality Data Program


Over 10,000 households in Clinton County rely on groundwater from private wells for drinking, cleaning, and other everyday activities. Despite this, there are no well-construction standards in Pennsylvania and relatively little is known about the chemical quality of the groundwater that we use for domestic purposes. While surface waters across the county have been studied and monitored by the Pennsylvania Department of Environmental Protection (DEP), most publicly available groundwater quality samples were collected more than 30 years ago and do not include analyses of many chemicals of concern today.

In 2016, the County received a $247,912 grant from the Commonwealth of Pennsylvania, Commonwealth Financing Authority (CFA) to collect and analyze water samples from private wells across the county in an effort to better understand current water-quality conditions and assess the impact of agricultural, mining, and other land-use practices on our resources.

The study, which was conducted by the U.S. Geological Survey, sampled 54 privately owned domestic-supply wells from across the county for a wide variety of substances including minerals, gases, and bacteria. These sites were randomly selected and included voluntary participation by residents.

Results from the study can be found on the U.S. Geological Survey’s (USGS) website at:


  • Partners for this project include the U.S. Geological Survey (USGS), the Pennsylvania Department of Environmental Protection, the Penn State Cooperative Extension, the Clinton County Conservation District, and the Clinton County Planning Department.

    Well Water Testing

    If you have any concerns about the quality of your well water, please contact the Pennsylvania Department of Environmental Protection (PADEP) North-central Regional Office in Williamsport for consultation at:

    DEP North-central Regional Office
    208 West Third St., Suite 101
    Williamsport, PA 17701
    Office Hours: 8 a.m. to 4 p.m.
    Phone: 570-327-3636 (24 hours)

    Addition Resources:

    Groundwater Facts

  • Groundwater: A Primer for Pennsylvanians
  • Drinking Water Regulations and Well Construction

  • U.S. EPA Drinking Water Regulations & Drinking Water Information
  • Drinking and Residential Water
  • PA DEP Private Water Wells Information
  • A Guide to Private Water Systems in Pennsylvania
  • Protecting Wells with Sanitary Well Caps and Grouting
  • Private Wells: What to Do After the Flood
  • Penn State Cooperative Extension: Master Well Owners Network
  • Interpreting Your Well Water Sampling Results

  • How to Interpret a Water Analysis Report
  • Penn State Drinking Water Interpretative Tool
  • Water Tests: What Do the Numbers Mean?
  • Well Water Contamination

  • Removal of Arsenic from Wells in Pennsylvania
  • Coliform Bacteria
  • Lead in Drinking Water
  • Methane Gas and its Removal from Wells in Pennsylvania
  • Nitrates in Drinking Water
  • Reducing Radon in Drinking Water