Bacteriostatic Water Price: What It Costs in 2026, Per Vial and Per mL

1. What Bacteriostatic Water Costs Right Now

As of September 2026, bacteriostatic water price listings ran from about $0.39 to $2.66 per mL, depending on vial size, channel and quantity. A single 30 mL vial cost roughly $19 to $25 from online medical suppliers, and 10 mL vials were listed from about $7 each in bulk to $15. Big vials are cheapest per mL; small vials are often cheapest per mL you actually use.

Every figure below comes from a named source seen in September 2026, and each is converted to a price per mL so the numbers can be compared. Prices move, especially during shortages, so treat them as a snapshot and check the seller before you order.

2. Bacteriostatic Water Price per mL: 13 Prices Compared, September 2026

Most price pages quote a price per vial, which hides the real comparison because vials run from 3 mL to 30 mL. We converted 12 seller listings and the pharmacy cost benchmark into dollars per mL. Chart first, then the full table.

Prices as listed on each seller's site or in search results in September 2026, before shipping and tax. Per-mL figures are our arithmetic. Rx and license-required items can only be bought by qualifying buyers.

A pharmacy price service adds a retail view. GoodRx showed an average retail price of $27.65 for the most common version of bacteriostatic water, with coupon prices as low as $14.10, and its default search was one 30 mL vial. Those prices apply to prescriptions filled at a pharmacy counter.

PureBac is not the cheapest per mL on this list, and the table shows it. The next two sections explain why per-mL price is the wrong number for most buyers, and what a low price usually leaves out.

3. What Pharmacies Pay, and Why It Matters

NADAC, the National Average Drug Acquisition Cost, is a benchmark published by the Centers for Medicare & Medicaid Services. It is built from a monthly survey of invoice prices that retail community pharmacies pay for drugs, and state Medicaid programs use it to set reimbursement.¹ NDCList, which republishes the NADAC files, showed $0.17097 per mL for the Hospira 30 mL vial effective August 19, 2026, up from $0.05717 in January 2025, and a range of $0.02578 to $0.17097 per mL since 2013. At the low end that is 77 cents a vial; now it is about $5.13, roughly three times the January 2025 figure.

That rise tracks supply. ASHP's shortage database has listed Bacteriostatic Water for Injection with Pfizer's 30 mL vials in limited supply because of manufacturing delays.² When the dominant manufacturer is constrained, acquisition costs climb and online resellers price accordingly. The gap between a $5.13 acquisition cost and a $27.65 average retail price is the pharmacy's dispensing cost, labor and margin on a low-volume item.

Pharmacists see the rise on their invoices before shoppers see it on shelves. In July 2026 a Florida pharmacy owner asked her peers on X about it:

“Acq” is acquisition cost, what the pharmacy paid its supplier. She did not say which case size, so we do not convert it to a per-mL price, but it lines up with the NADAC trend above.

4. Why a 30 mL Vial Costs Less per mL Than a 3 mL Vial

The water and benzyl alcohol are the cheapest part of the product. The cost sits in everything around them, and most of it is charged per vial, not per milliliter:

• The container, stopper and crimp seal, which cost about the same at 3 mL as at 30 mL.
• Filling and sealing under sterile conditions, then sterilizing.
• Lot release testing for sterility, endotoxins, pH and preservative content, spread across however many vials are in the lot.
• Labeling, inspection, packaging and shipping each unit.

Scale matters too. The Hospira 30 mL vial is a plastic fliptop vial supplied in trays of 25 and sold mainly to hospitals.³ Smaller research-grade vials are produced in smaller lots, often in glass, so fixed costs are spread over fewer milliliters. And 30 mL is the ceiling: the USP monograph limits bacteriostatic water for injection to containers of 30 mL or less, so there is no larger, cheaper size to buy.⁴

5. The Hidden Cost: Waste After 28 Days

Price per mL assumes you use every milliliter. Most people do not. Once a multiple-dose vial is punctured, USP <797> sets a beyond-use date of 28 days unless the manufacturer specifies otherwise,⁵ and CDC's multi-dose vial guidance tells users to write the date on the vial at first puncture so that discard date can be tracked.⁶ Whatever is left on day 28 is discarded, and you paid for it.

The chart and table below show the cost per mL actually used in one 28-day window, using single-vial prices: $19.95 for a generic 30 mL vial, $14.99 for a 10 mL vial and $7.99 for a 3 mL vial. Each figure is the total spent on vials divided by the mL drawn; everything left over is waste.

The pattern is simple: buy the smallest vial that covers what you will use in 28 days. A 30 mL vial is the best deal only if you really will draw 20 mL or more from it within four weeks. The 10 mL vs 3 mL guide works through this for common reconstitution volumes, and the 28-day rule guide explains why the clock exists.

6. What “Cheap Bacteriostatic Water” Usually Cuts

A low price is not a problem in itself. The Hospira vial at a licensed wholesaler is cheap per mL and fully documented. The concern is when a low price comes from skipping the parts a buyer cannot see. Before choosing on price, check for these:

1. A lot-specific certificate of analysis. Benzyl alcohol content, pH, sterility and endotoxin results against named limits, for the lot on your vial. A generic PDF with no lot number documents nothing.
2. A named testing lab and method. “Lab tested” with no lab and no method is a claim, not a result.
3. A traceable lot number and expiry printed on the vial. Without these, a recall or a bad batch cannot be traced.
4. Label basics. Preservative strength stated, volume of 30 mL or less, and the newborn warning. These are monograph requirements and cost nothing to print, so their absence says something.⁴
5. An identifiable seller. A business name and address and someone who can answer a question about a specific lot.

The COA guide shows what a complete certificate looks like.

7. Prescription Price vs Research-Grade Price

The phrase “bacteriostatic water for injection price” covers two different products, and their prices are not directly comparable.

FDA-approved Bacteriostatic Water for Injection, USP is labeled Rx only.³ Its sticker price can be low per mL, but reaching it takes a prescription and a pharmacy, or a license and a wholesale account. For an individual, the real cost can include a prescriber visit. For a patient whose plan covers it, the out-of-pocket cost may be a copay rather than the list price.

Research-grade bacteriostatic water is sold without a prescription as a laboratory reagent. It has no NDC and no FDA drug approval, so its price reflects the seller's own manufacturing and testing, and the only evidence of quality is the documentation that comes with each lot. That is why two research vials with the same label can differ in price by a factor of two: one may come with lot-level test results from a named lab and the other with a product photo.

When comparing within either group, compare like with like: same channel, same vial size, and the same level of documentation.

8. How to Pay Less Without Cutting Corners

• Match vial size to your 28-day use. This saves more than any coupon for most buyers.
• Buy multi-packs only for vials you will open in time. Unopened vials keep until their expiry date; the 28-day clock starts only at first puncture.
• If you have a prescription, compare discount card prices. GoodRx coupon prices were about half its average retail price in September 2026.
• For a practice or lab: Licensed buyers can use wholesale channels; see the bulk and wholesale guide.

For reference, PureBac prices are $14.99 for a 10 mL vial, $7.99 for a 3 mL vial and $134.90 for a 10-pack of 10 mL vials, each lot with its own COA. The full list is on the products page.