Well water in Lehigh County, Pennsylvania

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Testing strongly recommended

private wells tested between 2007 and 2025 in Lehigh County had total coliform above the EPA limit (0 MPN/100mL), according to the Penn State water testing lab.

353 private wells tested 2007 to 2025 in state summaries; 836 test results across 15 contaminants from at least 163 wells, 1925 to 2026; nitrate has the most at 196. Data refreshed September 16, 2026.

Compiled by Nick at Well Water Nerd from public records. How these pages are built

These are samples homeowners paid to send to the Penn State lab, often because of a suspected problem, so shares above the limit run higher than a random survey would find.

An estimated 61,285 people in Lehigh County get their drinking water from a private well, per USGS 2015 county water use. That is about 17% of residents.

Separately, the USGS national arsenic model estimates that <1% of the 61,285 people on private wells in Lehigh County draw water above 10 ug/L, from geology and well depth rather than local tests.

What homeowner tests found

Penn State Agricultural Analytical Services Lab drinking water summaries: private wells tested and reported to the state, 2007 to 2025. Shares are against the level the state applies to each contaminant, named in the last column; several are stricter than EPA.

Contaminant	Above state level	Wells tested	Median	Highest	State level
Total coliform	34%	353		201	0 MPN/100mL
Manganese	20%	131	10	1,180	50 ug/L
Lead (first draw)	4%	145		2,039	15 ug/L
E. coli	4%	353		12.4	0 MPN/100mL
Iron	4%	131	100	700	300 ug/L
Nitrate + nitrite as N	3%	180	2.9	27.7	10 mg/L
Arsenic	2%	99		20	10 ug/L
Copper	2%	186	0.02	4.65	1.3 mg/L
Chloride	0%	22	33	188	250 mg/L
Sodium		11	19.5	187

What individual samples found

Each row summarizes every public sample for that contaminant inside Lehigh County. 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
Nitrate 1925 to 2026	22%	196	98%	3.87	50	10 mg/L EPA limit
Fluoride 1965 to 2026	0%	95	95%	0	1	4 mg/L EPA limit
Arsenic 1975 to 2026	0%	13	69%	0.2	5	10 ug/L EPA limit
Lead 1973 to 2026	0%	12	58%	0	0.316	15 ug/L EPA limit
Copper 1973 to 2026	0%	11	73%	0	0.046	1.3 mg/L EPA limit
Chloride 1925 to 2026	no limit	156	100%	7	115	250 mg/L nuisance level
Iron 1925 to 2026	no limit	128	98%	85	22,000	300 ug/L nuisance level
Sodium 1925 to 2026	no limit	98	100%	5.35	153	20 mg/L health guideline
Manganese 1965 to 2026	no limit	97	95%	0	700	300 ug/L health guideline

Sampled fewer than 10 times, too few to summarize: PFOA (1), PFOS (1), Radium (226 + 228) (7), E. coli (7), Uranium (6), Radon (8).

Over time

Share of samples above the limit by period. A cell needs ten samples to show; a comparison needs twenty in each period. Later periods sample fewer wells, and often the ones already known to have a problem.

Contaminant	before 2000	2000s	2010s	2020s
Nitrate	24%169 samples	17%12 samples	10%10 samples	n/a

Closer than the county

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 address

What this means

Among homeowners in Lehigh County who sent a sample to the state lab, the health-based limits most often exceeded were total coliform (34% of 353 wells), lead (4% of 145 wells), and E. coli (4% of 353 wells). These are ordinary wells tested by their owners, so the shares are the best available picture of a typical well here, with one caveat: people test more often when they suspect a problem.

Manganese exceeds the state's advisory level in a sizable share of wells; this is mostly a taste, staining or diet issue rather than a toxicity one.

What to test for in Lehigh County

1
Total coliform
34% of 353 local wells tested were above the EPA limit.
2
Nitrate
22% of 196 local samples were above the limit.
3
Lead
4% of 145 local wells tested were above the EPA limit.
4
E. coli
4% of 353 local wells tested were above the EPA limit.
5
Arsenic
2% of 99 local wells tested were above the EPA limit.
6
Copper
2% of 186 local wells tested were above the EPA limit.
7
Radon
Median local reading is 292 pCi/L.
8
Manganese
20% of 131 local wells tested were above the EPA secondary standard.

Test your Lehigh County well for total coliform, 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 $209 Already 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.

Affiliate links: the merchant pays us a commission and the price is the same for you. It does not change what the data above says. As an Amazon Associate we earn from qualifying purchases.

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 Lehigh County numbers, $29. Every line explained, ranked by what matters, with the fix for each.

Wells in Lehigh County

6,470 domestic wells in Lehigh County are on record with the state. 100% are drilled into bedrock, and the typical well is 200 feet deep (one in ten goes past 420 feet).

In a typical Lehigh County well, bedrock starts about 40 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 Lehigh County

Valley and Ridge carbonate-rock aquifers

Sandstone and carbonate-rock. Layered sandstone and limestone means a well may draw from either. Hardness and iron are routine, and the limestone layers can carry bacteria and nitrate from the surface quickly, so test for both yearly.

Classification from the USGS Principal Aquifers of the United States (national map, 2003 edition, GIS release 2015), read at the county 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

Total coliform

Inspect and repair the well cap and casing, then shock chlorinate and retest; UV disinfection whole-house; Chlorination system

Manganese

Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis

Nitrate

Point-of-use reverse osmosis; Anion exchange; Distillation

Iron

Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration

Systems we would look at first

Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.

For total coliform

Aquasana Rhino Well Water with UV

whole-house, at the point of entry, about $2,871

Whole-house system built for wells: sediment pre-filter, KDF and carbon, and a UV lamp rated to kill 99.99% of bacteria and viruses. It does not remove arsenic, nitrate, uranium or radon.

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.

For nitrate

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.

Free, no obligation

Get on the list for a free in-home water test in Lehigh County

No water treatment company serves Lehigh County through Well Water Nerd yet. We are signing licensed companies on county by county: they test at your tap for free, walk you through the numbers, and quote treatment only if something needs fixing. Leave your details and you are first in line. Nothing is shared until a company joins for Lehigh County, and you get an email naming it first.

Common questions

How deep are wells in Lehigh County?

The typical domestic well in Lehigh County is 200 feet deep, based on 6,470 wells reported to the state. One in ten is deeper than 420 feet. 100% are drilled into bedrock.

Is there arsenic in well water in Lehigh County?

Arsenic was detected in 69% of 13 public well samples in Lehigh County, 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 often should I test a private well in Lehigh County?

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 in Lehigh County

25 towns have fewer than 30 public samples and are included in the Lehigh County totals above rather than shown separately: Alburtis borough, Allentown, Bethlehem, Catasauqua borough, Coopersburg borough, Coplay borough, Emmaus borough, Fountain Hill borough, Hanover township, Heidelberg township, Lower Macungie township, Lower Milford township, Lowhill township, Lynn township, Macungie borough, North Whitehall township, Salisbury township, Slatington borough, South Whitehall township, Upper Macungie township, Upper Milford township, Upper Saucon township, Washington township, Weisenberg township, Whitehall township.

Counties near Lehigh County

Closest first. Groundwater does not stop at a line on a map, so the next county 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: 836 samples in Lehigh County. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
Penn State Agricultural Analytical Services Lab drinking water summaries: summaries for 10 contaminants in Lehigh County, up to 353 wells each. County summaries of private water samples tested by the Penn State Agricultural Analytical Services Laboratory since 2007, published by the College of Agricultural Sciences. Counts are samples, not distinct wells. Shares are against the standard the lab prints: the EPA maximum contaminant level, or the secondary standard for iron, manganese and chloride. Lead is the first-draw result. Medians printed as 0.00 are stored as null because the lab rounds to two decimals. Retrieved September 16, 2026.
USGS national arsenic model (Ayotte 2017): estimated share of 61,285 people on private wells in Lehigh County above 10 ug/L of arsenic, from geology, well depth and land use. County estimates of domestic well users with arsenic above 10 ug/L from the USGS national logistic regression model (Ayotte, Medalie and Qi, 2017), with private well population from the USGS 2015 county water-use compilation (Dieter and others, 2018). Retrieved September 15, 2026.
Pennsylvania Groundwater Information System (PaGWIS) wells: 9,855 well records in Lehigh County, 6,470 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.