Deuterium and O-18 Water Test
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Deuterium and O-18 Water Test

2 Analytes Tested
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Deuterium analysis is a reliable method for fingerprinting a water sample, or identifying what the source of a water quality sample might be. This is commonly performed to see where a leak is coming from, or where a particular pollutant may be flowing from. Oxygen-18 (O-18) is a stable isotope of oxygen included with deuterium analysis. Comparing O-18 and deuterium concentrations allows you to evaluate your water sample's source AND evaporative history. Such analysis not only provides a way to trace your water source through soil and groundwater but also its movement in the atmosphere. This is test is for natural abundance testing. 

NOTE: Any sample materials that may have been altered with enriched, depleted, or otherwise modified natural abundances of any isotopes are NOT ACCEPTABLE for analysis. Furthermore, if samples containing altered (enriched, depleted, etc) isotopes are submitted and their activities in any way damage equipment, interrupt operations, or cause the loss or reanalysis of any samples to occur, the submitter may be financially responsible for damages. 

Customers of this test almost always need to order multiple kits to properly identify a source–as the sample of unknown source, as well as suspected source(s) must be tested.

This Tap Score water test package provides all required materials to properly collect and submit a sample for certified laboratory testing. Reported results will include detailed, quantified analysis of deuterium and oxygen-18 isotopes in drinking water. 

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Deuterium and O-18 Water Test

Is this the right test for you?

What our scientists say:

“ Comparing O-18 and deuterium concentrations allows you to evaluate your water sample's source AND evaporative history. It can be a useful way to pinpoint the source of an unknown sample. "

This is the right test if you:

  • Seeking to identify the source of an unknown water sample.

How it works

  • Collect Sample

    1. Collect Sample

    We ship you everything you need to test your drinking water, including a guide on how to collect your sample.

  • Ship to Lab

    2. Ship to Lab

    Send your sample back to us for rigorous, certified, independent testing. The shipping’s on us!

  • Get Report

    3. Get Report

    After our labs analyze your sample, we’ll send you a full report on what's in your water and what to do next.

What’s inside your testing kit?

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Sampling Instructions

Every test comes with step by step instructions on how to prepare your water source, collect your water sample, and prepare your sample for return shipment to our labs.

Collection Bottles

Your kit includes all the bottles, tubes or vials necessary to collect your water sample. For most kits, however, there is only one collection bottle needed.

Sample Information Card

Your kit includes a postcard that asks for a few details about how and where you collected your sample (i.e. kitchen faucet). Just fill it out, drop it in the return box, and we'll do the rest.

Prepaid Shipping Label

Shipping is always on us. This package includes a prepaid return shipping label to the lab. Just stick the provided label on the outside of the box and drop it in the mail.

Return Container (If Applicable)

Some of our tests require your water sample to be cold when it reaches our labs. If this applies to your test, the proper refrigeration items will be included.

Your custom
Tap Score

After our certified labs receive and test your water sample, we will email your custom Tap Score Report, a simple digital tool that helps you understand exactly what’s in your water and what you can do about it.


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Go ahead. Ask us anything

We know this stuff feels complicated, but we are dedicated to keeping it simple. Answers to all your questions are always a chat or FAQ away.


Which test is right for me?

When in doubt, start with a Core Kit to analyze multiple contaminants with a single test. If you have more specific motivations for testing, try our Customize My Kit feature to match your needs to the right test(s).

What's the turnaround time?

Most people receive results within 3-5 business days after the lab receives their sample. However, some tests may require additional analytical time so be sure to check each kit’s product page for the most accurate estimate.

What will my report include?

Your report will rank your water against local and federal safety benchmarks, provide a thorough breakdown of any contaminants detected and how they may be affecting your health or plumbing, and provide non-biased treatment recommendations.

Are Tap Score labs certified?

Every lab facility in our network is certified with accreditations ranging from ISO to NELAC/ELAP, Direct State, DoD, DoE, DoH and beyond. Need a specific certification? Let us know so that we can meet your needs accordingly.