How to Store Sterile Water Safely: Temperature, Opened Containers, and Expiry

Keep unopened sterile water sealed and store it at controlled room temperature (68–77°F/ 20–25°C), away from excessive heat and freezing. Once you open a single-dose container, discard whatever is left. Before each use, check the label, seal, liquid clarity, and expiry date. This guide covers sterile water for injection and sterile water for irrigation, which are different products with different labels.

Sterile Water for Injection vs. Sterile Water for Irrigation

Sterile Water for Injection, USP is a sterile, nonpyrogenic diluent with no bacteriostat, antimicrobial agent, or added buffer. Hospira's label describes it as supplied only in single-dose containers to dilute or dissolve drugs for injection, and marks it prescription-only. The label also says it must be made approximately isotonic before use.

Sterile Water for Irrigation, USP is made for irrigating, washing, and rinsing. Its label states that it is for irrigation only and not for injection.

Never swap one for the other. Use the product whose label matches the task.

How to Store Unopened Containers

Hospira's labels for both products call for storage at 20–25°C (68–77°F), which USP calls controlled room temperature. Several labels also say to protect the product from freezing, and manufacturers advise avoiding excessive heat.

Some practical habits help:

• Keep containers in their original tray or carton until you need them.
• Use a clean, dry shelf or cabinet, away from sinks and waste areas.
• Store injection and irrigation products separately so they are not mixed up.
• Label shelves clearly and use older stock first.

What to Do With Opened Containers

Sterile water has no preservative, so it has no built-in protection against microbial growth once a container is opened. The injection label says single-dose containers must not be reused and any unused portion must be discarded.

CDC guidance says the same about single-dose vials in general: do not combine leftover contents or store them for later use. It also suggests choosing the smallest vial that meets your needs, which reduces waste and the urge to save the rest.

Good aseptic habits start before the container is opened:

• Clean your hands first.
• Wipe the vial's rubber stopper with alcohol and let it dry. See our alcohol prep pads.
• Use a new sterile needle and syringe for every entry. See our needles and syringes.

Preserved solutions follow different rules from plain sterile water. Our guide to BAC water vs sterile water vs saline explains the difference.

Check the Expiry Date and the Container

Every container has a printed expiry date. Do not use it after that date, even if the water looks normal, because clear liquid does not prove sterility.

Before use, the injection label says to use the product only if the solution is clear and the seal is intact. Throw away any container that is cracked, leaking, cloudy, or has a broken seal. Check stock on a regular schedule so expired containers are removed.

Quick Storage Reference

Check	What to do
Temperature	68–77°F (20–25°C)
Freezing	Protect from freezing
Opened single-dose container	Discard the unused portion
Seal and clarity	Use only if the seal is intact and the liquid is clear
Expiry date	Do not use after the printed date

Common Storage Mistakes

• Keeping an opened vial "for later."
• Storing containers near sinks, drains, or waste bins.
• Leaving stock in a hot vehicle or letting it freeze.
• Mixing up injection and irrigation containers.
• Ignoring expiry dates, damaged seals, or cloudy liquid.

Frequently Asked Questions

How should sterile water for injection be stored? 

Keep it sealed in its original packaging at 68–77°F (20–25°C), away from excessive heat, and follow the instructions on your product's label.

Can I keep sterile water after opening it? 

No. Sterile water contains no preservative and comes in single-dose containers. Discard the unused portion after use.

Does sterile water expire? 

Yes. Each container has a printed expiry date, and it should not be used after that date.

Can I use sterile water for irrigation for injection? 

No. Its label states that it is for irrigation only and not for injection. Use only the product labeled for your task.

Should sterile water be refrigerated? 

Not according to the Hospira labels, which call for room temperature (68–77°F). Some also say to protect the product from freezing. Always check the label on your own product.

This article is for general educational purposes and isn't a substitute for the manufacturer's labeling or guidance from your employer, pharmacist, or healthcare provider. Follow the storage and handling instructions on your product's label.