You can test pH, acidity, and several other wine parameters at home—but eventually many serious home winemakers and small wineries encounter a question their home equipment can't confidently answer.

Is my wine actually stable and ready to bottle?

A professional wine laboratory can provide considerably more precise chemical analysis, investigate potential microbial contamination, verify fermentation and stability, and perform specialized testing that isn't practical in a home winery.

But which laboratory should you use?

This CellarCraft guide provides a starting point for finding professional wine-testing services in the United States.

When Should You Send Wine to a Laboratory?

Laboratory analysis can be particularly valuable when:

• You're preparing a wine for bottling.

• Fermentation appears to have stopped unexpectedly.

• You're unsure whether malolactic fermentation is complete.

• You suspect Brettanomyces or another microbial problem.

• A wine develops unusual aromas, flavors, haze, or carbonation.

• You need an accurate residual-sugar measurement.

• You need alcohol verification.

• You're troubleshooting elevated volatile acidity.

• You want to evaluate protein or tartrate stability.

• You're moving from hobby production toward commercial winemaking.

• You need analysis associated with regulatory or export requirements.

The laboratory you choose should depend on the question you're trying to answer.

Small-Batch & Home Winemaker Testing

For home winemakers and very small producers, start with laboratories that offer individual analytical tests and accept shipped samples.

Typical testing needs include:

pH • Titratable Acidity • Free/Total SO₂ • Residual Sugar • Alcohol • Volatile Acidity • Malic Acid • Stability

Cornell Craft Beverage Analytical Laboratory — Geneva, New York

Cornell University's Craft Beverage Analytical Laboratory is an excellent starting point for small-batch producers seeking university-based analytical services.

Its available wine analyses include pH, titratable acidity, malic and lactic acid, acetic acid, alcohol, free and total SO₂, residual sugar, carbon dioxide, cold stability, heat stability, bottle sterility, trace elements, sensory appraisal, and other analyses.

The laboratory also offers consultation when a winemaker isn't certain which analysis is appropriate.

Best suited for: Home winemakers, small producers, troubleshooting, routine analysis and educational support.

Website: Cornell Craft Beverage Analytical Laboratory

Midwest Grape and Wine Industry Institute — Iowa State University

Iowa State University's Midwest Grape and Wine Industry Institute provides analytical laboratory services for wine and other fermented beverages.

Samples can be submitted through its online portal or shipped with a paper sample-intake form.

The institute's testing capabilities include common wine-quality measurements such as acidity, sugar, alcohol, sulfur dioxide and acetic acid, with additional analyses available by contacting the laboratory.

One particularly useful feature for developing winemakers is access to technical support and laboratory-result interpretation.

Best suited for: Home winemakers, Midwest wineries, small commercial producers and winemakers who want help interpreting their results.

Website: Midwest Grape and Wine Industry Institute, Iowa State University

Small & Growing Commercial Winery Testing

Once production becomes commercial, laboratory needs often expand beyond individual measurements.

A growing winery may need routine chemistry, filtration and stability testing, fermentation monitoring, troubleshooting and more sophisticated quality-control support.

Enartis USA Laboratory — Windsor, California

Enartis provides analytical laboratory services designed to support winemaking decisions throughout production.

Its published laboratory capabilities include core chemistry such as:

pH

Titratable acidity

Free SO₂

Total SO₂

Alcohol

Enartis also provides specialized filtration and stability-related analyses, including turbidity, filterability, pectin and glucan evaluation.

Those services can be particularly valuable when preparing wines for filtration and bottling.

Best suited for: Small and medium commercial wineries, wineries troubleshooting filtration or stability issues, and producers developing more formal quality-control programs.

Location: Windsor, California

Website: Enartis USA

Advanced Microbial & Commercial Wine Analysis

Some problems require considerably more sophisticated testing.

If you're investigating Brettanomyces, microbial populations, fermentation problems, unusual volatile compounds, or advanced production questions, a specialized wine laboratory may be the better choice.

ETS Laboratories — St. Helena, California

ETS Laboratories is one of the best-known independent analytical laboratories serving the wine industry.

Founded in 1978, ETS now offers hundreds of analytical options across numerous sample types.

Its capabilities extend well beyond routine wine chemistry into advanced analytical and microbiological testing.

For example, ETS provides specialized Brettanomyces monitoring using measurements such as 4-ethylphenol and 4-ethylguaiacol and offers additional microbiological analyses.

ETS also provides analytical dashboards and tools designed for professional winery quality-control programs.

Best suited for: Commercial wineries, advanced troubleshooting, microbial analysis, Brettanomyces investigation and producers requiring sophisticated analytical capabilities.

Primary laboratory: St. Helena, California

Website: ETS Laboratories

Regulatory & Export Wine Testing

Commercial winemakers should understand an important distinction:

A laboratory that can test wine isn't automatically the appropriate laboratory for every regulatory purpose.

The Alcohol and Tobacco Tax and Trade Bureau (TTB) maintains a certification program for chemists and qualified laboratories performing certain analyses associated with wine export requirements.

The official TTB Certified Wine Chemists list includes laboratories and chemists throughout the United States.

Because certification status can change, always verify a laboratory's current status before submitting samples for a regulatory purpose.

Best resource: TTB Certified Wine Chemists & Qualified Laboratories

Which Wine Laboratory Should You Choose?

Think about the problem before choosing the laboratory.

Routine Small-Batch Testing

Start with:

Cornell Craft Beverage Analytical Laboratory

or

Iowa State Midwest Grape and Wine Industry Institute

These are particularly attractive when you're looking for routine wine analysis, educational support, or help understanding your results.

Small Commercial Winery Quality Control

Consider:

Enartis USA

when you need broader production, filtration and stability support.

Advanced Microbial or Analytical Investigation

Consider:

ETS Laboratories

when you need advanced microbial testing, Brettanomyces investigation, sophisticated analytical techniques, or commercial winery-level analysis.

Regulatory or Export Testing

Start with the:

TTB Certified Wine Chemists & Qualified Laboratories Directory

and verify that the laboratory and specific analysis meet the regulatory requirement you're trying to satisfy.

What Should You Ask the Laboratory?

Before shipping your wine, contact the laboratory or review its current sample-submission instructions.

Ask:

1. Which test should I order?

Describe the problem you're trying to solve rather than simply requesting every available analysis.

2. How much wine do you need?

Sample-volume requirements vary by test.

3. How should the sample be collected?

Proper sampling matters—especially for microbial analysis.

Microorganisms may not be evenly distributed throughout a barrel or tank, which means an improperly collected sample can produce misleading results.

4. How should the sample be shipped?

Follow the laboratory's current packaging and shipping instructions.

5. What is the expected turnaround time?

Some analyses take substantially longer than routine chemistry.

6. Will someone help interpret the results?

A number by itself isn't always useful. Ask whether consultation or interpretation is available.

Don't Wait Until Something Tastes Wrong

Professional laboratory analysis isn't only for wine that has already developed a problem.

Testing can be part of a preventative quality-control program.

A simple approach is:

TEST → RECORD → EVALUATE → CORRECT → RETEST → BOTTLE

Home testing remains extremely useful for routine monitoring.

Professional laboratories become valuable when you need greater precision, microbial identification, specialized stability testing, troubleshooting, or regulatory analysis.

The two approaches should complement each other.

Before You Send Your Wine to the Lab

Use the CellarCraft Pre-Bottling W