Sustainability Report.

Answer first: in the lifetime of IBC Denver, we’ve diverted more than 14,300 IBC totes from landfill, avoided an estimated 457,600 kilograms of CO₂-equivalent, and kept 3.9 million pounds of HDPE out of the waste stream. The math behind those numbers is below.

The math behind the numbers

Every reborn tote is benchmarked against the avoided alternative — manufacturing a new equivalent IBC and landfilling the old one. We use the following per-tote estimates:

• 32 kg CO₂-equivalent avoided per tote (manufacturing emissions for a new caged composite IBC)
• 45 gallons of crude oil equivalent avoided per tote (HDPE feedstock + manufacturing energy)
• 5.6 kg of HDPE diverted from landfill per tote (the bottle itself)
• 14 kg of steel kept in service per tote (the cage)

These are conservative industry figures. Our internal life-cycle analysis pegs the actual savings about 8% higher — we use the conservative estimates publicly so we can over-deliver in writing.

Closed-loop, end-to-end

Sustainability only counts if you measure the whole loop. Here’s how we close ours:

• Inbound: empty totes arrive via buy-back pickup, route-share with delivery trucks, or direct shipment from customers.
• Reconditioning: 9-stage hot-wash, leak-test, certify. Wash water flows to municipal treatment under permit.
• Re-sale: reborn tote ships back out as a used or reconditioned product.
• End-of-life: bottle granulated to HDPE pellet, cage stripped to scrap steel, pallet refurbished or mulched. Zero landfill.
• Documentation: Certificate of Recycling issued quarterly to every customer who routes totes through us.

What we don’t measure (yet)

We’re not perfect, and we’re not going to pretend to be. Here’s what isn’t in our numbers above:

• The carbon cost of our own freight fleet (we use industry-average diesel emissions for offsetting estimates, but it’s not in the headline numbers)
• The carbon cost of wash water heating (the hot-wash cycle uses natural gas; we’re evaluating an electric alternative)
• Cage galvanization durability — we’re still working on a clean way to model how many cages survive each cycle

We’ll add these in the next annual report. Promised.

Eco impact, year by year

The wash water audit, separately

Our hot-wash skid uses approximately 18 gallons of city water per tote across the wash, rinse, and sanitization stages. Across roughly 2,500 totes per year that works out to about 45,000 gallons of water annually. By the standards of industrial cleaning operations this is genuinely modest — a small commercial laundromat consumes about ten times that volume in a year. The wash water is treated under our municipal industrial pretreatment permit and discharged through the city sewer.

We are evaluating two ways to reduce the water consumption further. The first is a closed-loop recirculation system that would let us reuse rinse water from one tote as wash water for the next, with a small bleed-off and makeup volume per cycle. The second is a greywater capture system that would route the final rinse water to landscape irrigation rather than to the sewer. Both projects are on a slow track because we want to get the chemistry right, but we expect to roll out at least one of them within the next 18 months.

Energy use breakdown

The hot-wash heater is the single largest energy user in our facility. It runs on natural gas at about 18 therms per day during normal operation, with a peak of about 26 therms when the bay is running at full capacity. Across a year that is roughly 4,200 therms, equivalent to about 22,000 kWh of energy. The electric load of the bay (lights, pumps, compressed air, the office, the small refrigerator that holds Pellet's wet food) is about 38,000 kWh per year. Total annual energy footprint of the operation is approximately 60,000 kWh-equivalent.

For comparison: a typical American household uses about 10,500 kWh per year. So the entire IBC Denver operation, processing 2,500 reborn totes annually, consumes about six times the energy of a single household. We believe this is one of the lower energy footprints in industrial reuse and recycling, but we are working to bring it lower.

Independent verification

We do not currently hold any third-party sustainability certifications (B Corp, ISO 14001, etc.). The honest reason is cost — these certifications run $4,000 to $20,000 per year in audit fees and our annual margin would not absorb that without raising tote prices, which we are unwilling to do. We have considered B Corp certification several times and we are still considering it.

What we offer instead is full document transparency. Any customer who wants to verify any number on this page can request the underlying records — wash logs, photographs, energy bills, water bills, disposal partner SDS sheets, end-of-life recycling certificates — and we will provide them in writing. Several customers have done this, and we have welcomed them to walk our yard in person to see the operation. The standing offer applies to anyone reading this page.

Sustainability frequently asked

The water side of the math

Water consumption rarely shows up in IBC tote sustainability claims because it is hard to measure and easy to ignore. We have measured ours, and we will share the numbers.

Water in our reconditioning bay

A single 9-stage hot-wash cycle uses approximately 18 gallons of city water across the cold pressure wash, the hot caustic wash, the triple potable rinse, and the optional sanitization stages. Across roughly 2,500 totes per year that works out to about 45,000 gallons of water consumed annually for reconditioning.

For perspective: 45,000 gallons is about half of what a single American household uses per year. It is roughly 0.2% of what a small commercial laundromat uses. By the standards of industrial cleaning operations, our water consumption is genuinely modest.

Water saved versus the alternative

The alternative to reconditioning a used tote is manufacturing a new tote and landfilling the old one. Manufacturing a new HDPE bottle consumes water at the polymer plant — roughly 30-50 gallons per kilogram of HDPE produced, depending on the manufacturing route. A new bottle weighs about 12 lbs, so the embedded water in a new bottle is roughly 165-270 gallons.

By reconditioning a used tote with 18 gallons of wash water, we are avoiding the embedded water of a new bottle (165-270 gallons), netting a savings of roughly 147-252 gallons per reborn tote. Multiplied by 2,500 totes per year, that is a net annual water savings of approximately 370,000 to 630,000 gallons. By the standards of small businesses, this is a meaningful contribution to regional water stewardship in a Front Range city where water is increasingly precious.

Where the wash water goes

Our wash water flows to municipal treatment under a permitted industrial pretreatment agreement with the City of Denver. The pretreatment permit requires us to neutralize the caustic wash water before discharge. We do this with a small in-line neutralization tank that adjusts pH to between 6.5 and 8.5 before release to the sewer line. We do not dump anything behind the building, into the storm drain, or into the South Platte. We are audited annually by the city to confirm compliance.

What we are working on for water

The next reduction we are evaluating is a closed-loop recirculation system for the rinse stages. The current process uses fresh potable water for each rinse cycle and discharges all of it. A recirculation system would let us reuse rinse water from one tote as wash water for the next, with a small bleed-off and makeup volume to maintain chemistry. Conservatively, the system could reduce our annual water consumption by 30-40%.

The other project on the horizon is a greywater capture system that would route the final rinse water (the cleanest of our wash streams) to landscape irrigation rather than to the sewer. The math is more complicated because of regulatory considerations, but the engineering is straightforward.

The materials side of the math

Beyond CO₂ and water, the third major sustainability metric for an IBC reconditioner is materials — what comes in, what goes out, and what gets diverted from waste streams.

Inbound materials

• Used IBC totes: approximately 2,750 per year arriving from buy-back partners and direct customer drop-offs.
• Replacement valves and parts: approximately 800 valve assemblies, 1,200 fill caps, 3,500 dust caps, and 600 EPDM gaskets per year.
• Replacement bottles for re-bottling: approximately 240 fresh HDPE bottles per year for tired totes that get a new heart instead of being recycled.
• Replacement pallets: approximately 480 hardwood, 220 plastic, and 60 steel-shod pallets per year.
• Wash chemistry: approximately 165 gallons of food-spec caustic concentrate, 22 gallons of food-spec sanitizer, and 8 gallons of pH adjuster per year.

Outbound materials

• Reborn IBC totes shipped: approximately 2,500 per year (the difference is the rejected 9% routed to recycling).
• HDPE pellet from granulated bottles: approximately 3,000 lbs per year of clean HDPE flake going to a regional pellet producer.
• Scrap steel from stripped cages: approximately 3,400 lbs per year going to a regional scrap mill.
• Hardwood mulch from rotted pallets: approximately 1,200 lbs per year going to a local landscape supply business.
• Wash water (treated): approximately 45,000 gallons per year discharged through the municipal sewer.
• Solid waste to landfill: approximately 0 lbs per year. Actually zero. This is the number we are most proud of.

The forgotten metrics

Most sustainability reports stop at CO₂ and maybe water. There are a handful of other metrics we have looked at over the years that paint a fuller picture.

Fleet diesel consumption

Our two trucks consume approximately 4,200 gallons of diesel per year. At industry-average emissions of 22.4 lbs of CO₂ per gallon of diesel, that is approximately 94,000 lbs (43,000 kg) of CO₂ from our own fleet. Roughly half of that is offset because the same trucks are running two-way routes — picking up empties on the same trip as delivering reborn totes — so the diesel cost per tote moved is much lower than the gross number suggests. We do not include this number in our headline tote-level CO₂ math because it is highly variable per shipment, but we do track it internally and we are looking at electric truck options for the local route loop as battery technology improves.

Worker commute

Our six employees commute an average of about 14 miles round-trip per day. Across 240 working days per year and average vehicle emissions, the team's commute footprint is approximately 8,000 lbs (3,600 kg) of CO₂ per year. Three of the six live close enough to bike or take light rail at least part of the year. We have considered offering a commute subsidy for non-driving alternatives but have not yet implemented one.

Office energy

The office and warehouse together use approximately 38,000 kWh of electricity per year. Our local utility's grid mix is roughly 40% renewable as of 2024 (mostly wind, with some solar and hydro), which means our electricity-related emissions are about 60% of what they would be on a fully fossil grid. The grid is getting cleaner each year and we benefit from that without doing anything ourselves.

Packaging of inbound supplies

The cardboard, plastic film, and pallet wrap that arrives with our valve and parts shipments adds up. We recycle all of it through our city's commercial recycling stream. Annual volume is approximately 220 lbs of cardboard, 38 lbs of plastic film, and 14 wood pallets per year. None of this goes to landfill.