How to Store Milled Rice Without Moisture and Pest Damage

By Bajrang Khaitan · Published 26 October 2026

The problem as you see it

You dispatch a lot that looked perfect in the packing hall. A few weeks later the dealer calls. Some bags smell musty, there is caking near the seams, a few have weevils, and the grain has lost its shine. The rice left your mill in good condition. Something went wrong in the godown or on the way to the customer.

This complaint comes up more in the monsoon months, and in godowns that were built for paddy or general goods rather than packed rice. The usual reaction is to blame the paddy or the polish. Very often the real cause is storage.

Why it happens

Milled rice takes moisture from the air around it. Once the husk and bran are removed, the grain has nothing left to protect it. Three things work together against you:

• Moisture pick-up. If rice is packed warm, straight from the whitener or silky polisher, the heat inside the bag condenses on the cooler bag surface and on nearby walls. Bags stacked directly on a damp floor or touching a damp wall draw moisture by contact. Humid air during the rains does the rest.
• Heat build-up. Large, tight stacks with no air gaps trap heat. Warm, moist rice is exactly what moulds and insects need.
• Pests. Rice weevil, lesser grain borer and moths come in through old stock, dirty bags, spilled grain in corners and doors left open. Bran dust on the floor feeds them. Once one stack is infested, it spreads to the rest.

Poor stock rotation makes all of this worse. When new lots are stacked in front of old ones, the oldest rice sits at the back for months and becomes the source of smell and infestation for the whole godown.

What to check, step by step

1. Packing temperature. Feel the rice at the packing point. If it is noticeably warm, let it cool in the bin or hopper before bagging. Packing hot rice is one of the most common causes of condensation inside bags.
2. Moisture at packing. Check the moisture of finished rice with a calibrated meter every shift, not only when a complaint comes in. Milled rice is generally considered safe for storage at around 14% moisture or below. If your readings are creeping up, find out why before the rice reaches the godown.
3. Pallets, not floors. Every stack should sit on wooden or plastic pallets. Keep a clear gap between stacks and walls, and between stacks, so air can move and you can walk around for inspection.
4. Stack size and pattern. Avoid very large solid stacks. Smaller stacks with alleys between them stay cooler and are easier to inspect and to fumigate.
5. Roof and ventilation. Check the roof for leaks before the monsoon. Open ventilators on dry days and keep them closed when the air outside is humid. A godown that smells damp is already a risk.
6. Daily cleaning. Sweep spilled rice and bran dust every day, especially in corners and under pallets. Do not keep used empty bags, husk or bran in the same godown as finished rice.
7. Weekly inspection. Walk the godown once a week. Look for webbing, insects on the top layer, warm spots inside a stack and caking. Push your hand into a few bags in the middle of the stack, not only the outer ones.
8. First in, first out. Mark every stack with its packing date and lot number. Dispatch the oldest stock first. Plan the godown layout so that old stock is never blocked behind new stock.
9. Licensed pest control. Fumigation and spraying must be done by a trained, licensed agency, with the correct exposure time and safety precautions. Never let untrained staff handle fumigants.
10. Bag quality. Check that bags are clean, properly stitched and suitable for the storage period and the transport route. Torn or weak bags let in moisture and insects, and a long truck journey in the rains is a test for any bag.

Transport is part of storage

Quality can also be lost after the rice leaves your gate. A truck that has carried fertiliser or cement, a tarpaulin with holes, or bags loaded in the rain can undo all the care taken in the godown. Ask your dispatch staff to check the truck body is clean and dry, that the tarpaulin covers the load fully, and that wet bags are never loaded. If the same dealer complains repeatedly, look at his storage conditions as well. Sometimes the rice is fine at your end and the damage happens in his shop.

When to call a consultant

If you have tightened all of this and complaints still come, the problem may start earlier in the line. Rice that leaves the mill with high moisture, too many brokens or bran still on the surface keeps badly in storage, however good the godown is. In those cases I look at the whole chain, from paddy drying and parboiling to the whitener and polisher settings, and then the godown and dispatch.

You can start with an online consultation, where I go through your photos, moisture readings and godown layout with you. If the issue needs someone to walk the mill floor and the godown, I can plan a mill visit.