Novonesis Lifts West Allis Fermentation 66%: The Mozzarella Culture Behind America's Italian Cheese Growth

If this were my cheese plant, I would check one supply line before signing the build. It would be the culture, ahead of the milk. Novonesis has just finished a build in Wisconsin that lifts fermentation capacity by about 66%.

What Novonesis finished at West Allis

The company cut the ribbon on 25 September 2026 and confirmed the work on 28 September. Fermentation capacity at the site rises by about 66% and packaging capacity by 17%. Novonesis calls West Allis one of the largest lactobacillus production sites in the world. The plant employs 360 people. It opened in 1929.

A starter culture is the bacteria that turns milk into cheese. It sets the acid, the flavour and the texture. Get the strain wrong and the vat fails. Most plants run the same one for years.

Why the site matters to mozzarella

West Allis makes Italian cheese cultures, and mozzarella is its main job. One batch of culture pellets carries enough bacteria to make 10,000 pounds of cheese, on the plant's own account. Six fermentation tanks sit on the site. It can make more than 140 cultures and runs about 60 of them regularly.

Cheese makers buy these cultures as frozen pellets. They go straight into the vat. The site holds them at minus 67 degrees Fahrenheit before they ship. A 27,000 square foot freezer went in with the latest build.

The money behind the build

BizTimes put the spend at $165 million across three phases from 2021 to 2026. The first phase cost $25 million and the second cost $35 million. Novonesis has committed about $100 million more to the site by 2028 or early 2029. It also pledged another ten years of spending at West Allis.

Where the cheese growth actually is

USDA figures show the split clearly. Italian-type cheese output rose 4.1% in July 2026 to 551 million pounds. Cheddar fell 1.7% to 328.6 million pounds in the same month. Mozzarella alone reached 433.3 million pounds, up 2.9%. Across January to July, Italian-type output was up 4.2% while cheddar was down 0.1%.

The gap between the two blocks is wide. On those USDA totals, Italian-type output ran about 150 million pounds ahead of last year. Cheddar gave back a little ground. One block is pulling the whole US cheese number along.

Why culture supply is thin

Very few firms can make cheese cultures at this scale. Novonesis was formed in 2024 by joining Chr. Hansen and Novozymes, a deal worth $12.3 billion. It holds a library of more than 40,000 bacterial strains. A new culture takes one to two years to bring out. An enzyme can take ten.

Scale is the barrier here. Fermentation halls, strain libraries and cold rooms all take years and money. A new supplier cannot buy its way in quickly.

It takes close to ten kilos of milk to make one kilo of cheese. Novonesis also sells coagulants that lift the yield from that milk. A small gain there changes the milk bill on every vat a plant runs.

What this means for the market

Cheese plans model milk, vats and buyers. Few of them model whether the culture supply can follow the tonnage. An entrant should ask who supplies the strain, where it is fermented and how long a swap takes. Phage resistance ties a plant to one culture house for years. The harder a market leans on mozzarella, the tighter that tie becomes.

Sizing the mozzarella tonnage behind a build like this, market by market, is the harder job. Our Global Cheese Database 2026 counts 39 cheese types across 48 countries in tonnes, with forecasts to 2030. Mozzarella and cheddar sit apart, which is what shows where a culture plant should go.