ReferenceA map, a dataset, or a directory. It makes no recommendation.
Choosing a Malt or Grain Supplier
This page exists because a directory of suppliers with no method for reading it is a phone book. The method is the useful part, and unlike a ranking it does not rot when a supplier changes what they do.
It generalises the approach already on Malthouses That Run Gluten-Free, which says the same thing about one category: not a list of malthouses you can trust, but a method for verifying one yourself.
Start here, because it changes every other answer
What does your gluten-free claim have to survive?
This is first, and it is about you rather than about any supplier. Two breweries can look at the same malthouse and reach opposite, correct conclusions.
- You serve people with celiac disease and carry a gluten-free label claim. Contamination control is not a preference. The finished-beer test cannot rescue a bad decision upstream, because the assays under-read on fermented product — see gluten testing methods. Your claim rests on pre-fermentation evidence, so the supplier's controls are your evidence.
- You brew gluten-free for the beer, the market, or preference, without a label claim. You have more latitude on facility questions and should spend your attention on malt quality and identity instead.
Everything below reads differently depending on which of those you are. A dedicated gluten-free malthouse is a strong answer to the first situation. A barley malthouse running a documented gluten-free process can be a perfectly good answer to either, and for some beers a better one. Neither statement is a recommendation; both are the shape of the question.
The five axes
1. Contamination control
What is actually in place, in descending order of what it proves:
| What the supplier runs | What it establishes | What you still verify |
|---|---|---|
| Dedicated gluten-free facility | No gluten grain on site | That "dedicated" means the facility and not one line; ask directly |
| Dedicated line, shared facility | Separation by equipment | The cross-contact control plan. As of September 2026 we have found no published plan for a shared-facility gluten-free brewery or malthouse, so this is a document you request rather than look up |
| Shared equipment, cleaning validation | A procedure exists | How it was validated, and on what matrix. Swabs and rinses before fermentation carry real information; a finished-product test does not settle it |
| Not stated | Nothing yet | Everything. This is a question, not a disqualification |
2. What arrives with the lot
Evidence is what separates a supplier you can plan around from one you discover.
- A per-lot report against the Lot Reporting Standard, or the seller's own equivalent, covering cultivar, harvest year, storage and handling.
- A certificate of analysis per lot, which is normal in barley and rare here. Read it knowing that barley-calibrated methods misreport these grains: a sorghum malt diastatic power reported as "below limit" is a non-answer rather than a failing grade. Reading a malt certificate covers the three common misreadings.
- A certificate on request, which is worth asking for before the first order rather than after a problem.
- Nothing stated. As of September 2026 we have found no widely used per-lot reporting practice among gluten-free malt sellers, so this is the common case rather than a red flag. It does mean your own incoming checks carry the weight.
3. Grain identity
Identity is what lets you repeat a beer.
- A named cultivar with lot traceability is the strongest position, and rare. Our own Blue Milo #4 record is a worked example of what that chain looks like when it holds.
- A named variety without lot trace still tells you something, because cultivar drives malt behaviour more than most buyers expect.
- Commodity grain means each delivery is a new experiment. That is workable if you measure, and expensive if you assume.
One question sorts sorghum before anything else: is it a tannin type? A supplier who cannot answer has told you about their lot identity rather than about their tannins. See tannin and non-tannin sorghum.
4. Fit for the beer you are making
- Base or character? Sorghum malt carries a diastatic power near 4 °ASBC against barley's ~116, so it is a flavour and extract contributor and not a conversion engine. Plan the enzymes separately rather than hoping the malt covers it.
- Gelatinisation temperature is a lot property, because amylose varies by variety. Your mash temperature may need to move between deliveries, and almost nobody publishes amylose per lot.
- Does the supplier sell what you will need at volume? A malt available in sacks and not in tonnes is a pilot ingredient.
5. What happens when something goes wrong
Rarely asked before the first order and always relevant after it. Who do you call, what will they tell you about the lot, and do they hold a retain sample? A supplier who keeps retains can answer questions about a batch you have already brewed. One who does not, cannot, however willing.
What our own directory records against these axes
We applied the five axes to the malt and grain sellers in the supplier and maltster directories — twenty entries, taking the pages' own groupings rather than inventing a classification. As of September 2026:
| Axis | Entries stating something | Of |
|---|---|---|
| Contamination control | 4 | 20 |
| Lot evidence | 0 | 20 |
| Grain identity | 0 | 20 |
The four that state a contamination position are Grouse Malt House (gluten-free malts exclusively), Eckert Malting & Brewing (a dedicated gluten-free facility), Jennifer Soles's Grouse entry, and Root Shoot Malting (a shared floor, stated plainly). Every other entry says nothing on the axis, and nothing at all is on record anywhere in these directories about per-lot evidence or grain identity.
That is the argument for this page being questions rather than filters. You cannot filter on facts nobody has published. Sixteen blank rows are not a defect in the directory, which reports what sellers state; they are the shape of a supply chain that has not been asked. Treat the blanks as your call list, and tell us what you learn — a stated answer becomes a directory entry, and the next brewer does not have to ask again.
How to check, rather than take on trust
The verification method is the same one on the malthouse page, applied to whichever axis you are testing:
- Read what the supplier states in their own words, and treat it as a claim rather than a fact. "Gluten-free facility" and "gluten-free line" are different sentences.
- Ask the question the claim does not answer. Dedicated facility or dedicated line. Tested at what threshold, by which method, on what material.
- Ask for the document, not the assurance. A certificate, a control plan, a lot report.
- Test your own incoming material where the claim matters to you. Third-party testing resources covers doing this without a lab.
- Write down what you were told and when. The supplier who was dedicated two years ago may not be today, and nothing will announce the change.
Why this site does not rank suppliers
Three reasons, and the third is the honest one.
The answer depends on you. A ranking would have to assume a single reader, and the first axis on this page is precisely that readers differ.
A ranking rots. Facilities change, lines get added, ownership changes. The community directory describes what a supplier states and dates it; a judgment would carry an implied currency it cannot keep.
Assurance is a service, and we would rather sell it than give a version of it away badly. Telling you the axes costs us nothing and helps you. Verifying that a named supplier actually satisfies them, and continues to, is work that takes someone's time. We would rather say that plainly than pretend the distinction is purely editorial.
Once a supplier passes these axes, Ordering Sorghum Malt covers what goes in the order, what to check on arrival, and what to do with a lot that is off.
Something here wrong, or a question this framework misses? Tell us.