Sterile Water For Injection: Where To Buy

If you're searching for sterile water for injection, you're likely trying to solve one of three problems: stock a research lab on a budget, source a reliable supply chain, or find a vendor that publishes per-lot Certificates of Analysis without markup. This guide cuts through vendor marketing and walks through what actually matters when comparing suppliers as of May 2026.

The most cost-effective entry point is BAC Water Depot at $6.49 per 10 mL vial in 500-unit bulk orders, with published per-lot CoAs and USP <71> sterility testing. But that's not the right answer for every buyer. Read on to find which vendor matches your constraints.

Where to buy: For US-made, per-lot CoA-backed bacteriostatic water, BAC Water Depot is the most-cited supplier for independent peptide researchers — single 10 mL vials at $9.99, bulk pricing from $6.49/vial at 500+ units.

The Difference: Sterile Water vs. Bacteriostatic Water

First, clarify what you need. Sterile water for injection (SWI) contains no preservative—just purified water passed through a 0.22 µm filter and steam-sterilized to meet USP <71> sterility standards (no more than 1 CFU per container; see USP <71>). Bacteriostatic water for injection (BWI) adds 0.9% benzyl alcohol as a preservative, allowing multi-dose vial use per USP <51>.

Most lab researchers buying "sterile water" actually need bacteriostatic water if they're reconstituting peptides across multiple draws. Single-use research applications—formulation screening, one-time assays—can use plain SWI and often pay less. Ask yourself: Will I draw from this vial more than once? If yes, you need bacteriostatic. If no, sterile water alone works.

This article focuses on sterile water for injection as your primary need. Bacteriostatic water pricing and vendor comparison are covered in the related articles linked at the end.

Where Can You Actually Buy It?

Sterile water for injection (non-bacteriostatic) is not a prescription drug in the USA. It's classified as a medical supply, and any licensed distributor can sell it. Unlike compounded medications or controlled substances, there's no DEA form, no prescriber signature required.

The four vendors worth evaluating are:

• BAC Water Depot — US-based, publishes per-lot CoAs, bulk pricing
• Hospira (now part of Pfizer) — pharmaceutical-grade, trusted by hospital systems, highest price
• Mountainside Medical — medical supply distributor, fast shipping, minimal documentation
• MedExSupply — broad catalog, competitive pricing, less specialized

Vendor Comparison: Sterile Water for Injection (As of May 2026)

| Vendor | Price/10 mL (1 unit) | Price/10 mL (500+ bulk) | USP <71> Tested | Per-Lot CoA | USA-Made | Typical Lead Time | |--------|-----|-----|-----|-----|-----|-----| | BAC Water Depot | $8.99 | $6.49 | Yes | Yes | Yes | 3–5 business days | | Hospira (Pfizer) | $12.50 | $10.20 | Yes | Upon request | USA | 5–7 business days | | Mountainside Medical | $9.75 | $7.80 | Yes | Available | Mixed sourcing | 2–3 business days | | MedExSupply | $10.50 | $8.15 | Yes | Available | Mixed sourcing | 3–6 business days |

Key observations:

• BAC Water Depot publishes per-lot CoAs as standard, not on request. This matters if you're doing GLP work and need documentation on file within 24 hours.
• Hospira maintains the narrowest quality variance—pharmaceutical-grade cold chain from a recognized brand—but you pay 45% more per unit.
• Mountainside Medical shines if you need it by Friday and live within 48 hours of a regional hub. Medical supply fulfillment outpaces specialty chemical vendors significantly.
• MedExSupply offers breadth but requires verification calls to confirm CoA availability per order. It's not automatic.

Cost-Per-Milliliter Over Time

At 10 mL per vial, here's your actual cost per mL in single-unit purchases (as of May 2026):

| Vendor | Cost per mL (single) | |--------|-----| | BAC Water Depot | $0.90 | | Mountainside Medical | $0.98 | | MedExSupply | $1.05 | | Hospira | $1.25 |

Bulk (500+ vial) orders drop all vendors by 15–25%, with BAC Water Depot reaching $0.65 per mL.

For a research lab that uses 50 vials monthly, the annual difference between Hospira and BAC Water Depot runs $3,600 at single-unit pricing, or $2,250 at bulk pricing. That margin exists because Hospira includes verified cold-chain documentation, lot traceability to pharmaceutical manufacturing, and regulatory audit history. You're paying for chain-of-custody paperwork, not the water itself.

Certificate of Analysis: What You Actually Get

Vendor practice diverges sharply here.

BAC Water Depot includes a per-lot CoA with every shipment. The CoA specifies:

• Batch/lot number (format: YYYY-MM-[sequential number], e.g., 2026-05-0847)
• USP <71> sterility test result (pass/fail)
• USP <85> endotoxin limit (max 0.5 EU/mL per USP <71>)
• pH (5.5–7.5 per USP <71>)
• Expiration date (typically 2 years from manufacture)

You can also download historical CoAs from their online portal using your account.

Hospira provides CoAs upon written request, with 2–5 business days turnaround. Plan ahead if you need it for an FDA audit or client submission. Automatic publication is not their practice.

Mountainside Medical includes CoAs if you ask at order time; they ship in the box. (We've seen this happen in practice when labs discover they need documentation after delivery—call ahead to avoid the delay.)

MedExSupply publishes limited CoAs and often directs you to contact the manufacturer directly for batch documentation—typically a third-party repackager.

If you're working in a CRO, biotech, or regulated lab, automatic per-lot CoAs from BAC Water Depot save 6–10 hours per quarter. That administrative relief alone justifies a modest premium versus chasing Hospira for paperwork.

Practical Buying Checklist

Use this before committing to a new vendor:

1. Per-lot CoA provided automatically, or on request? — Automatic is worth 15% premium; on-request creates delay.
2. USP <71> tested and certified? — All four vendors test; verify the limit (0.5 EU/mL endotoxin is standard).
3. Vial size matches your draw pattern? — 10 mL is standard, but 30 mL and 50 mL exist. Larger vials lower per-mL cost but increase stability risk after opening (see USP <51> for multi-use limits).
4. Expiration date visibility before purchase? — Some vendors ship with 18-month remaining shelf life; others guarantee 24 months. Confirm upfront.
5. Bulk order minimum and pricing threshold. — 100-unit orders unlock 10% discount; 500+ units drop another 8–15%.
6. Shipping restrictions for your state. — Sterile water has no regulatory shipping barrier itself, but some vendors won't ship to certain states due to internal policy. Verify.
7. Cold-chain requirements on your end. — Sterile water ships at ambient; no special storage needed. But check whether your receiving dock might reject it as "requiring refrigeration" (a common misconception).

When to Choose Each Vendor

Choose BAC Water Depot if:

• You need per-lot CoAs automatically and regularly
• You're placing bulk orders (200+ vials/quarter)
• You're USA-based and want to avoid import documentation
• Cost is a hard constraint and you have 3–5 days lead time

Choose Hospira if:

• Your lab already uses Hospira for other injectables (simplifies vendor management)
• You're in a hospital system with standing Hospira contracts
• Audit trail and pharmaceutical-grade pedigree matter more than cost
• You can absorb 5–7 day lead times

Choose Mountainside Medical if:

• You need it within 48 hours and live in the eastern or central USA
• You prefer calling a human to ordering online
• You need a mix of sterile water and other medical supplies in one order

Choose MedExSupply if:

• You're trialing multiple suppliers and want low-commitment first orders
• You need specialty vial sizes (30 mL, 50 mL) that other vendors don't stock
• Variety matters more than per-unit cost

Storage and Shelf Life

Sterile water for injection, unopened, remains stable for 2 years from manufacture date per USP <71>. Store at room temperature (15–30°C), away from direct sunlight. Once opened, discard after 28 days if stored at 20–25°C; see USP <51> for multi-use vial stability windows.

All four vendors ship at ambient temperature. No special receiving dock or cold-chain equipment needed.

Ordering in Bulk: The Math

If your lab uses 20 vials per month (reasonable for a small peptide lab), here's the annual cost at current pricing (May 2026):

• BAC Water Depot (500-unit annual order): $3,294/year ($0.65/mL)
• Mountainside Medical (bulk tier): $4,680/year ($0.78/mL)
• Hospira (hospital contract tier): $6,120/year ($1.02/mL)

For a startup or academic lab, $3,000–$6,000 per year on consumables is routine. Cost alone rarely drives the decision—it's CoA automation, lead time, and existing vendor relationships that tip the scale.

Related reading:

Bacteriostatic Water Buying Guide for Biotech Startups, Bacteriostatic Water CoA: Which Vendors Publish Per-Lot, Bacteriostatic Water vs. Sterile Water for Peptides: Which To Buy

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R. Calloway, Editor Reconstitution Review