Uranium Water Test: The Well Test Most Owners Skip

Uranium has no color, taste, or smell, and the routine tests many well owners order focus on bacteria, nitrate, pH, and total dissolved solids rather than metals. That gap helps explain why a uranium water test often gets overlooked, even in areas where the bedrock contains uranium. 

The EPA sets a uranium limit of 30 micrograms per liter for public water systems. Private wells fall outside that federal rule, so well owners are responsible for arranging their own testing. At ETR Laboratories, uranium is currently listed in our Basic, Premium, and Ultimate well water panels, and we also offer a stand-alone uranium test.

Here is what to know about where uranium comes from, who should test, how to read the result, and which type of test actually answers the question.

Key Takeaways

• Uranium occurs naturally in bedrock and is not part of the routine annual testing list most private well owners follow.
• The EPA limit is 30 micrograms per liter, but that standard applies to public water systems rather than private wells.
• The main health concern from natural uranium in drinking water is its chemical effect on the kidneys, not radiation.
• A uranium-specific test measures uranium directly, while gross alpha is a broader radiation screen.
• Test when buying a home with a well or drilling a new one, then follow the retesting guidance that applies to your result and location.

Why Uranium Isn’t on the Routine Test List

Routine private well guidance usually emphasizes coliform bacteria, nitrate, pH, and total dissolved solids. Uranium is different because its presence depends heavily on local geology, so it tends to appear in regional guidance or broader metals and radionuclide testing rather than the basic annual list. 

Private wells are also not regulated by the federal government under the Safe Drinking Water Act. State agencies and local boards of health may publish recommendations, but the well owner generally has to arrange the test.

Where Uranium in Well Water Comes From

Uranium occurs naturally in rock and can dissolve into groundwater as water moves through uranium-bearing formations. The Connecticut Department of Public Health notes that deeper bedrock wells can be particularly susceptible.

Arsenic is another naturally occurring element associated with some bedrock wells and has its own 10 parts per billion limit.

Granite and Bedrock Wells

Granite is one well-known source. Uranium occurs naturally in granitic and metasedimentary rock, and studies have found high concentrations in some wells drilled into these formations.

USGS sampling in northeastern Washington found two private wells with uranium concentrations of 1,130 and 1,180 micrograms per liter, nearly 40 times the federal limit. A USGS study in central Maine found its highest uranium values within 5 to 10 kilometers of granitic intrusions.

Those findings show where elevated uranium can occur. They do not tell you what is in a particular well.

It Is Not Only a Granite Problem

Uranium can also occur in other geological formations.

A North Dakota survey from 1991 and 1992 found that 26 percent of 158 private wells sampled in the southwest exceeded 20 micrograms per liter, the proposed federal limit used at the time. The area was associated with uraniferous lignite rather than granite.

Minnesota also reports some of its highest radionuclide levels in source water in the Mount Simon-Hinckley and Jordan aquifers.

How Common Is Uranium in Well Water?

Studies from several states show that elevated uranium is real but highly dependent on geology.

State	Wells sampled	What the study found
Connecticut	2,191 samples, 2013–2018	4.7% above 30 µg/L
Maine	1,093 bedrock wells in greater Augusta	53 wells, or 4.8%, above 30 µg/L
New Hampshire	232 bedrock wells	28% exceeded at least one of four limits for arsenic, lead, manganese, or uranium

The New Hampshire percentage covers four metals, not uranium alone. A USGS fact sheet separately estimated that about 7,500 New Hampshire residents were exposed to well water above the uranium limit.

What Does the EPA Uranium Limit Mean for a Private Well?

The EPA maximum contaminant level for uranium in drinking water is 30 micrograms per liter, while the health goal is zero. The 30 µg/L requirement applies to public water systems, not privately owned wells. Private well owners can still use it as a benchmark when reading their own laboratory results.

Public systems have been required to meet the uranium standard since December 2003.

Why Is Uranium More of a Kidney Concern Than a Radiation Concern?

The primary concern from natural uranium in drinking water is chemical toxicity.

The ATSDR states that the health effects associated with natural uranium are primarily due to its chemical effects rather than radiation. The kidneys are the main organ of concern, and the EPA also lists kidney toxicity as a potential effect from exposure above its drinking water standard.

EPA materials also discuss possible cancer risk, although ATSDR notes that natural uranium has not been classified for carcinogenicity.

Connecticut DPH says bathing and showering in water containing uranium are generally not a concern unless levels are extremely high. Drinking and cooking water are the main focus.

How Does a Uranium Water Test Work?

A uranium-specific test and a gross alpha screen answer different questions.

Uranium-Specific Test vs Gross Alpha Screening

Test	What it measures	Compares directly with 30 µg/L?	Best used for
Uranium-specific test	Uranium mass	Yes	Checking uranium against the EPA benchmark
Gross alpha screening	Alpha radiation from all sources combined	No	Broader radionuclide screening

A uranium-specific test reports uranium by mass, so the result can be compared directly with the 30 µg/L standard. Laboratories commonly use methods such as ICP-MS, and EPA Method 200.8 is an approved drinking water method that includes uranium.

Gross alpha measures alpha radiation from multiple sources and cannot substitute for a uranium-specific result.

Sampling and What to Ask the Lab

Uranium testing requires laboratory analysis rather than a home strip or general water-quality meter. Metals samples are generally preserved with acid, and EPA Method 200.8 allows properly preserved samples to be held for months.

Before ordering, ask:

• Which analytical method does the lab use?
• What is its reporting limit for uranium?
• Is uranium included within the laboratory’s accredited scope?

ETR Laboratories holds ISO/IEC 17025 accreditation through ANAB for the testing listed in our scope of accreditation. The specific scope should always be checked for the analyte you need. 

Can You Test Well Water for Uranium at Home?

You can usually collect the sample yourself if the laboratory allows it, but the uranium measurement itself happens in a laboratory.

A mail-in uranium water test is still a laboratory test. “Mail-in” only describes how the sample gets there.

Use the bottles and collection instructions supplied by the lab. ETR kits generally include instructions, pre-labeled bottles, a sample information form, and a prepaid return label, as explained in our guide to what comes in an ETR water test kit.

A home reading for pH, hardness, or total dissolved solids cannot tell you whether uranium is present.

How Often Should You Test for Uranium?

Testing schedules differ by agency, so follow the guidance that applies where you live.

• Connecticut DPH recommends testing when buying a home with a private well or drilling a new well, then retesting every five years and testing treated water annually.
• EPA advises private well owners to test for radionuclides every three years.

General bacteria and nitrate testing follows a different well water testing schedule.

If you are buying or refinancing a home, check whether the lender, loan program, state, or local authority requires particular parameters before ordering.

How Are Uranium, Radium, and Radon Connected?

Uranium naturally decays into radium and eventually radon, so an elevated uranium result can be a reason to consider radon testing as well.

Our guide to testing well water and indoor air for radon explains that relationship in more detail.

How Should You Read a Uranium Result?

Your result generally falls into one of three situations:

• Not detected or well below 30 µg/L: Follow the retesting schedule appropriate for your location and circumstances. Remember that “not detected” means below the laboratory’s reporting limit, not necessarily absolute zero.
• Near 30 µg/L: A repeat sample can help confirm the finding because uranium levels in well water can fluctuate.
• Above 30 µg/L: Confirming the result with another sample is reasonable before making long-term decisions. Connecticut DPH recommends treatment for elevated uranium and advises using bottled or appropriately treated water for drinking and cooking in the meantime.

Reverse osmosis is one treatment Connecticut DPH discusses for drinking water, while ion exchange is another option. After treatment is installed, follow-up testing can confirm whether the uranium concentration has dropped.

For help interpreting the reporting limit, units, and comparison values, see our guide to reading a water test report.

Check What Your Current Panel Includes

Before ordering a stand-alone uranium test, check the metals section of any panel you already have.

Uranium is currently listed in ETR’s Basic, Premium, and Ultimate well water panels. If your existing panel already includes it, you do not need to order a separate uranium test.

Our guide to choosing a water testing panel can help if you are comparing options, while heavy metals testing covers other metals that may occur in drinking water.

Frequently Asked Questions

Can I shower in water that has uranium in it?

Generally, yes. Connecticut DPH says bathing and showering in water containing uranium are usually not a health concern unless concentrations are extremely high. The main concern is ingesting the water through drinking and cooking.

How much does a uranium water test cost?

ETR’s stand-alone Uranium Water Test is currently $45, with results listed at 1 to 3 business days after the sample reaches the lab. Uranium is also included in the Basic, Premium, and Ultimate well water panels, with the Basic panel currently starting at $179.

How do you remove uranium from well water?

Reverse osmosis at the drinking-water tap is one commonly recommended approach, while ion exchange is another option. ETR does not sell treatment systems, and follow-up testing after installation can confirm whether uranium levels have dropped.

Which states have uranium in well water?

Studies have documented elevated uranium in Connecticut, Maine, New Hampshire, North Dakota, and Washington, as well as in particular aquifers in Minnesota. Uranium follows geology rather than state borders, so these examples show where it has been studied, not every place it may occur. 

Does tap water have uranium?

It can. Uranium occurs naturally in groundwater, so both private wells and public systems supplied by groundwater can encounter it. Public water systems subject to federal drinking water rules must meet the EPA uranium standard, while private well owners arrange their own testing.

Is uranium included in a standard well water test?

There is no universal standard private-well panel. Routine annual guidance commonly focuses on bacteria and basic water-quality indicators, while uranium may appear in broader metals or radionuclide testing.

At ETR, uranium is currently listed in the Basic, Premium, and Ultimate well water panels, so check an existing report before ordering a stand-alone test.

Find Out What Is in Your Well Before It Becomes a Question

If uranium is your only concern, ETR’s Uranium Water Test is currently $45, with results listed at 1 to 3 business days after the sample reaches our lab.

If your well has never been tested more broadly, the Basic Well Water Test starts at $179 and includes uranium, bacteria and other metals. You can also add a Radon in Water Test for $40.

Every ETR test includes a free consultation with one of our in-house water quality experts. Talk to us today.