Well water in Tredyffrin township, Pennsylvania
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Testing recommended
tested well samples in Tredyffrin township exceeded the EPA limit for nitrate (10 mg/L), based on public data from USGS Water Quality Portal.
The strongest signal is radium (226 + 228): 45% of 11 local samples were above the limit, too few samples to carry the headline but first on the test list below.
345 test results across 12 contaminants from at least 28 wells, 1961 to 2006; nitrate has the most at 81. Data refreshed September 3, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
What individual samples found
Each row summarizes every public sample for that contaminant inside Tredyffrin township. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.
| Contaminant | Above limit | Samples | Detected | Median | Highest | Limit |
|---|---|---|---|---|---|---|
| Radium (226 + 228) 1986 to 1988 | 11 | 73% | 4.5 | 44 | 5 pCi/L EPA limit | |
| Nitrate 1961 to 2006 | 81 | 100% | 2.8 | 23.5 | 10 mg/L EPA limit | |
| Lead 1975 to 2006 | 20 | 65% | 0 | 20 | 15 ug/L EPA limit | |
| Fluoride 1961 to 2006 | 25 | 80% | 0.1 | 0.4 | 4 mg/L EPA limit | |
| Arsenic 1975 to 2006 | 16 | 75% | 1 | 8 | 10 ug/L EPA limit | |
| Copper 1982 to 2006 | 16 | 75% | 0.001 | 0.43 | 1.3 mg/L EPA limit | |
| Uranium 1986 to 2006 | 10 | 50% | 0.08 | 2 | 30 ug/L EPA limit | |
| Chloride 1961 to 2006 | no limit | 52 | 100% | 12 | 350 | 250 mg/L nuisance level |
| Manganese 1961 to 2006 | no limit | 33 | 70% | 0 | 880 | 300 ug/L health guideline |
| Iron 1961 to 2006 | no limit | 33 | 58% | 10 | 35,000 | 300 ug/L nuisance level |
| Sodium 1961 to 2006 | no limit | 30 | 97% | 7.7 | 160 | 20 mg/L health guideline |
| Radon 1986 to 2003 | no limit | 18 | 100% | 625 | 4,200 | 2,000 pCi/L health guideline |
Closer than the town
See the sampled wells near your address
The same records, drawn around one point: which wells within a few miles were sampled and what they found, how deep the wells next to you were drilled, and any leaking tank or cleanup site within a mile.
Check my addressWhat this means
The contaminants most often above their limit here are radium (226 + 228) (45% of 11 samples), nitrate (14% of 81 samples), and lead (5% of 20 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.
Chloride, Manganese, and Iron are widespread in local groundwater. They are mainly a staining and taste problem, but high manganese also carries a health advisory for infants.
What to test for in Tredyffrin township
- 1Radium (226 + 228)45% of 11 local samples were above the limit.
- 2Nitrate14% of 81 local samples were above the limit.
- 3Lead5% of 20 local samples were above the limit.
- 4Coliform bacteriaRecommended for every private well, every year.
- 5RadonMedian local reading is 625 pCi/L.
- 6ChlorideDetected in 100% of local samples.
- 7FluorideDetected in 80% of local samples.
Test your Tredyffrin township well for radium (226 + 228), nitrate and lead
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
Just want bacteria checked first? Tap Score coliform and E. coli test, $99. Coliform and E. coli are the tests every well needs every year.
Want a quick look before paying for a lab? Home well water test strips on Amazon check hardness, iron, pH and nitrate in minutes. They are a screen, not a result: arsenic, bacteria, uranium and PFAS need a certified lab.
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Where to get a well tested in Pennsylvania: certified labs, state programs and prices.
Already have results back? Get your lab report read against the Tredyffrin township numbers, $29. Every line explained, ranked by what matters, with the fix for each.
Wells in Tredyffrin township
149 domestic wells in Tredyffrin township are on record with the state. 100% are drilled into bedrock, and the typical well is 202 feet deep (one in ten goes past 405 feet).
In a typical Tredyffrin township well, bedrock starts about 31 feet down, the median yield is 15 gallons per minute, 8% of wells yield under 3 gallons per minute and usually need a storage tank.
Bedrock wells are where arsenic, uranium and radon come from: the water sits in fractures in granite and metamorphic rock and picks up whatever the rock carries. That is why testing for those three matters more here than in a dug or gravel well.
Find your own well's report
The state keeps the driller's report for most wells drilled since 1984. It tells you how deep your well is, where bedrock starts, and how much water it makes, which decides what treatment can work.
- Open PaGWIS (Pennsylvania Geological Survey) and choose Water Well.
- The record lists depth, depth to bedrock, yield and use; drillers have reported new wells to the state since 1966.
Pennsylvania has no private well construction standard and does not require testing, so many older wells have no record at all.
The rock under Tredyffrin township
Piedmont and Blue Ridge carbonate-rock aquifers
Carbonate-rock. Limestone and dolomite move water through cracks and solution channels, sometimes very fast. Bacteria and nitrate can travel from the surface to a well in days, so annual bacteria testing matters more here than most places; hardness is a given.
Classification from the USGS Principal Aquifers of the United States (national map, 2003 edition, GIS release 2015), read at the town centroid. A single well can sit in a different unit, especially near a boundary.
Official help in Pennsylvania
Two places to start that are not selling anything: the state program that answers private well questions, and its list of labs certified to run drinking water tests. A certified lab is the difference between a result you can act on and a number.
- Private Wells, PA DEP
- Laboratory Accreditation Program, PA DEP
Treatment that fits the local profile
Radium (226 + 228)
Water softener (cation exchange); Point-of-use reverse osmosis
Nitrate
Point-of-use reverse osmosis; Anion exchange; Distillation
Lead
Point-of-use reverse osmosis; Certified lead-removal carbon filter; Neutralizing filter to raise pH and stop leaching
Manganese
Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
Iron
Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Systems we would look at first
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For radium (226 + 228)
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For nitrate
Aquasana SmartFlow reverse osmosis
under-sink or countertop, about $225
Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.
For lead
Aquasana Claryum 3-Stage under-sink filter
under-sink or countertop, about $175
Certified to NSF/ANSI 53 to reduce 99% of lead and 99.7% of PFOA and PFOS at the tap. Not a fix for arsenic, nitrate or bacteria.
For lead
Acid neutralizing filter
whole-house, at the point of entry, about $1,200
Raises pH so plumbing stops leaching lead and copper.
For manganese
Iron and manganese oxidizing filter
whole-house, at the point of entry, about $1,800
Air-injection or greensand media; fixes staining at the source.
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Common questions
How deep are wells in Tredyffrin township?
The typical domestic well in Tredyffrin township is 202 feet deep, based on 149 wells reported to the state. One in ten is deeper than 405 feet. 100% are drilled into bedrock.
Is there arsenic in well water in Tredyffrin township?
Arsenic was detected in 75% of 16 public well samples in Tredyffrin township, and 0% were above the EPA limit of 10 ug/L. Arsenic has no taste or smell; a lab test is the only way to know your level.
How high is radon in well water in Tredyffrin township?
The median radon level across 18 public samples in Tredyffrin township was 625 pCi/L, with a high of 4,200 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Tredyffrin township?
Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.
Towns near Tredyffrin township
Closest first. Groundwater does not stop at a line on a map, so the next town over is a fair second opinion.
Want the numbers themselves? Download the Pennsylvania dataset as CSV, every county and town, with the sources named.
Sources
- USGS Water Quality Portal: 345 samples in Tredyffrin township. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
- Pennsylvania Groundwater Information System (PaGWIS) wells: 455 well records in Tredyffrin township, 149 domestic. Water well records from the Pennsylvania Groundwater Information System, Pennsylvania Geological Survey (DCNR). Only aggregates are shown; owner names and addresses are never stored. Retrieved September 16, 2026.
Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.