Pennsylvania well water testing should be at the top of your list if you're among the state's 870,000 private well owners. Unlike public water systems, private wells aren't monitored by any government agency. No one tests your water unless you do.
That might be fine in some states. In Pennsylvania, it's a genuine concern. PA has an unusually complex mix of natural and industrial contaminants — from radon and arsenic in the bedrock to PFAS from military bases to methane from natural gas drilling. Knowing what to test for, how often, and what the results mean is the difference between drinking clean water and unknowingly exposing your family to something harmful.
Not every well faces the same risks. What you should test depends heavily on where in Pennsylvania you live and what's happening around your property. But some tests apply to everyone.
These are the non-negotiables — the tests every private well in Pennsylvania should get annually:
Beyond the basics, PA has several region-specific risks that warrant additional testing:
| Contaminant | Where in PA | Risk Level | Test Cost |
|---|---|---|---|
| Radon | Statewide, worst in Reading Prong (Lehigh Valley) | High — 67% of wells affected in some counties | $25–$50 |
| Arsenic | Central and eastern PA | Moderate — 12% of tested wells exceed EPA limits | $20–$40 |
| PFAS (PFOA, PFOS) | Warminster, Warrington, military base areas | High in affected zones | $200–$400 |
| Methane | Central and northwestern PA (Marcellus Shale) | Moderate — near active/former drilling sites | $50–$100 |
| Lead | Statewide (older homes with lead plumbing) | Moderate | $20–$35 |
| Volatile organic compounds (VOCs) | Near industrial sites statewide | Site-dependent | $100–$200 |
| Agricultural chemicals | Southeast and south-central PA | Moderate in farming areas | $75–$200 |
Pennsylvania was among the first states to set its own maximum contaminant levels for PFAS — doing so 15 months before the federal EPA finalized its national rule in April 2024. That's not because PA was being cautious for no reason. The state has a serious PFAS problem.
The most concentrated contamination zones are around the former Naval Air Warfare Center in Warminster and the former Naval Air Station Joint Reserve Base in Warrington, both in Bucks County. Military use of PFAS-containing firefighting foam (AFFF) contaminated groundwater that feeds private wells throughout the surrounding area.
Beyond the military sites, PA has identified 125+ water systems with PFAS detections. If your well is within 5 miles of a military base, airport, fire training facility, or industrial site that used PFAS, testing is strongly recommended.
PFAS testing costs more than basic water panels — typically $200 to $400 for a comprehensive PFAS screen. But given the health implications (PFAS exposure is linked to cancer, thyroid disease, immune system effects, and developmental issues), it's worth the investment if you're in or near a contaminated area.
If your well tests positive for PFAS above EPA limits (4 parts per trillion for PFOA and PFOS):
In some contamination zones near military bases, the federal government has provided bottled water or connected affected homes to public water supplies. Check with your local municipality about any available assistance programs.
Most people think of radon as an air quality issue — the gas that seeps into basements from underlying rock. But radon also dissolves into groundwater, and when that water comes through your shower or faucet, the radon is released into your indoor air.
Pennsylvania has some of the highest radon levels in the United States. The Reading Prong geological formation, stretching across the Lehigh Valley and into Berks and Northampton counties, produces particularly high radon concentrations. In some PA counties, 67% of private wells show elevated radon levels.
The EPA hasn't set a formal maximum contaminant level for radon in drinking water, but the proposed standard is 300 pCi/L for water systems that don't have indoor radon mitigation, and 4,000 pCi/L for those that do. Many PA wells exceed both thresholds.
Radon in water is treatable. Aeration systems (which bubble air through the water to release radon gas, then vent it outside) are the most common solution, costing $1,500 to $4,000 installed. GAC filters also reduce radon but require careful handling when replacing spent filters, since the carbon absorbs the radioactive material.
Central and northwestern Pennsylvania sit on the Marcellus Shale formation — one of the largest natural gas deposits in the world. Natural gas drilling (fracking) in this region has raised concerns about methane migration into private water wells.
Methane in well water isn't necessarily caused by drilling — it occurs naturally in some formations. But concentrations have increased in some areas near active drilling operations. At low levels, methane isn't toxic to drink, but it can create explosion and fire risks when it accumulates in enclosed spaces like well houses or basements.
If your property is in the Marcellus Shale region (much of Tioga, Bradford, Susquehanna, and surrounding counties), consider baseline methane testing before any nearby drilling begins and periodic testing afterward. The cost is modest — $50 to $100 per test.
Here's a practical testing schedule for Pennsylvania well owners:
| Test | Frequency | Cost | Why |
|---|---|---|---|
| Coliform bacteria | Annually | $15–$30 | Most common contamination issue |
| Nitrates | Annually | $15–$25 | Agricultural and septic contamination |
| pH and minerals | Every 2–3 years | $25–$50 | Corrosion and plumbing protection |
| Radon | Once (then after changes) | $25–$50 | Stable unless well construction changes |
| Arsenic | Once (then every 5 years) | $20–$40 | Geological source — doesn't change fast |
| PFAS | Once if in risk zone | $200–$400 | Contamination plumes shift slowly |
| Comprehensive panel | Every 5 years or when buying | $150–$400 | Full baseline check |
You should also test immediately after any of these events:
PA has several options for certified water testing, ranging from $15 for a single-parameter test to $400+ for comprehensive panels:
When collecting samples, follow the lab's instructions exactly. Improper collection is the most common reason for false results — especially for bacteria tests, where touching the inside of the sample container or letting it sit too long before delivery can skew results.
PA's well construction standards are managed by the Department of Conservation and Natural Resources (DCNR), which licenses well drillers. There are 600+ licensed drillers in the state — a centralized, searchable database, unlike PA's fragmented septic data.
Key protection steps for PA well owners:
Pennsylvania doesn't mandate regular testing for existing private wells. However, some municipalities require testing when a property is sold. Regardless of legal requirements, annual bacteria and nitrate testing is strongly recommended by PA DEP, Penn State Extension, and public health professionals.
A comprehensive panel testing for bacteria, nitrates, pH, hardness, metals, and other parameters typically runs $150 to $400 through a PA DEP-certified lab. Basic bacteria-only tests cost $15 to $30. PFAS testing adds $200 to $400 on top of a standard panel.
Military bases aren't the only source. Airports, fire training facilities, landfills, and some manufacturing plants also used PFAS-containing products. If you're within 5 miles of any of these facilities, testing is a reasonable precaution. PA has identified 125+ contaminated water systems beyond the major military sites.
Don't drink the water until the issue is resolved. Common fixes include shock chlorination of the well (flooding the well with a concentrated bleach solution), repairing the well cap or casing to prevent surface water entry, and addressing nearby contamination sources. Retest 1–2 weeks after treatment to confirm the bacteria are gone.
Home test kits are fine for quick screening, but they're not accurate enough for health decisions. If you suspect contamination, use a PA DEP-certified lab. The extra cost ($15–$30 for bacteria vs. $5 for a home kit) buys you reliable, legally defensible results.
Pennsylvania's groundwater is generally good, but the state's mix of geological, agricultural, and industrial factors means private well owners can't assume it's safe without testing. An annual bacteria test costs less than a case of bottled water per month — and gives you actual data instead of guesswork.
Need a well inspection, pump repair, or water treatment system? Our directory includes well water service providers across Pennsylvania — from licensed drillers to water treatment specialists. Search by county to find companies serving your area.
Connect with licensed professionals in Pennsylvania for your septic or well water needs.
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