Running a Waste Audit for a Singapore Business: Measuring Before Reducing

A waste audit in Singapore is not a generic sustainability exercise. It is the only way to know whether your business falls under the food waste segregation mandate in the Resource Sustainability Act, or whether your recyclables end up incinerated because of contamination. This method produces a usable baseline, not a feel-good exercise.

The audit answers one question: what is in your bin, by weight, and where does each fraction legally need to go? Without that answer, you cannot negotiate with your general waste collector, meet NEA reporting obligations, or avoid penalties under the Resource Sustainability Act. The method below works for any trade premises, F&B outlet, retail store, or office tower, and produces a tonnage baseline that aligns with the categories the National Environment Agency uses in its waste statistics yearbook.

A commercial waste audit follows a standard bin-sort methodology. You sort waste at the point of disposal into the streams that matter under the NEA's framework: general waste, commingled recycling, food waste, and e-waste. Each stream has a different regulatory path and a different cost structure.

Define the Audit Period

Audit for seven consecutive days. A single day catches only the delivery schedule. Seven days catches the weekend spike, the Monday clearance, and the variation in stock-in dates. The NEA's own waste composition studies use a seven-day sampling window. If your premise generates more than 10 tonnes of food waste per year, the food waste segregation mandate threshold applies, and the audit confirms whether you exceed it.

Sort at the Point of Disposal

Collect every bag from every bin inside the premise for the same 24-hour period each day. Do not mix streams. Lay each bag on a tarp and sort into four bins: general waste, commingled recyclables (the stream that goes into the blue bin under the National Recycling Programme), food waste, and regulated e-waste (items covered under the Producer Responsibility Scheme for e-waste operated by ALBA E-waste Smart Recycling). Non-regulated waste such as industrial equipment or construction debris is out of scope for this audit.

Weigh Each Fraction

Use a floor scale accurate to 0.5 kg. Record the gross weight of each sorted stream per day. Subtract the bin or bag tare. The output is a daily tonnage per stream. Sum the seven days and divide by seven for the daily average. Multiply by the number of trading days per year. The result is your annual waste tonnage baseline, split by stream.

Measure the Contamination Rate

After weighing the commingled recycling fraction, sort it again to remove contaminants: food residue, liquids, soft plastics, textiles, e-waste, and non-recyclable packaging. Weigh the contaminants. The contamination rate is the contaminant weight divided by the total commingled weight, expressed as a percentage. A rate above 40% matches the NEA's published blue bin contamination rate for 2023. That means roughly half of your recycling effort is paying for incineration.

The NEA does not require every business to run a waste audit. But the Resource Sustainability Act imposes obligations that make an audit the practical first step for any premise that may fall under the food waste segregation mandate, the Mandatory Packaging Reporting rule, or the e-waste EPR framework.

Food Waste Segregation Mandate

Since 2024, commercial premises generating more than 10 tonnes of food waste per year must segregate that waste for treatment. The threshold applies to food waste from kitchens, canteens, and cafeterias. An audit that measures your food waste fraction by weight tells you whether you are above the line. If you are, you must arrange separate collection by a licensed food waste collector and send the material to a treatment facility such as the anaerobic digestion plant at Tuas Nexus, designed for 400 tonnes per day and expected operational from 2026. There is no grace period for non-compliance.

Mandatory Packaging Reporting

Producers with annual turnover above SGD 10 million must report packaging volumes and plans annually under Mandatory Packaging Reporting. The audit does not directly measure packaging, that requires a separate packaging-usage study, but the waste composition analysis from the audit gives you the baseline weight of packaging material (paper, cardboard, plastics, glass, metals) in your waste stream. That baseline is what you compare against when you report reduction targets.

E-Waste Obligations

Regulated e-waste, ICT equipment, large appliances, electric mobility devices, portable batteries, consumer lamps, and solar panels, must be collected through ALBA E-waste Smart Recycling, the appointed Producer Responsibility Scheme operator. The audit reveals whether your premise is generating regulated e-waste that is currently going into the general waste bin. That is illegal disposal. The fine under the RSA can reach SGD 10,000 per offence.

The audit output is a waste tonnage baseline structured by stream. That baseline has three direct uses.

First, it tells you whether you exceed the segregation mandate threshold. A daily average of 28 kg of food waste across a full trading year puts you at roughly 10 tonnes per year. Above that, you must segregate. Below it, you may choose to segregate voluntarily, but the mandate does not apply.

Second, it reveals your waste generation per employee. Divide the daily general waste tonnage by the number of full-time staff. Compare against the 2023 national average of roughly 0.9 kg per person per day for domestic waste (including trade premises). A higher number points to overpackaging, single-use disposables, or food waste that could be diverted.

Third, it gives you a negotiating position with your general waste collector. Your collector charges based on bin size, collection frequency, and disposal weight. The gate fee at the waste-to-energy incineration plant, set administratively and revised periodically, is part of that cost. A segregated food waste stream reduces the general waste tonnage and can lower the collection frequency. A low contamination rate in the commingled recycling stream means the MRF residual rate drops, and the collector may offer a lower rate because fewer tonnes are incinerated. Do not ask for a price list; the market changes weekly. Ask your collector for a proposal based on your audit data.

Metric	Your Audit Result	What It Tells You
Daily general waste tonnage	Sum of general waste fraction	Baseline for collection frequency negotiation
Daily food waste tonnage	Sum of food waste fraction	Compare against 10 t/yr mandate threshold
Daily commingled recycling tonnage	Sum of recyclables fraction	Recycling participation volume, before contamination
Contamination rate	Contaminant weight / total commingled weight	Share of recycling effort wasted to incineration
Daily e-waste tonnage	Sum of regulated e-waste fraction	Legal disposal obligation under RSA
Annual waste tonnage baseline	Daily average x trading days	Benchmark for reduction targets and MPR reporting

Once you have your baseline, the next step is to act on it. The audit is not a report you file once; it is a measurement you repeat annually to track change against the 2030 targets in the Zero Waste Masterplan: 70% national recycling rate, 30% domestic recycling rate, and a 30% reduction in waste-to-landfill. Your business contributes to the domestic recycling rate, which was 12% in 2023, not the national rate of 52%, which is dominated by industrial scrap.

Set a Waste Diversion Rate Target

Your waste diversion rate is the share of your total waste that is recycled or treated rather than incinerated. Start with the current diversion rate from the audit, divide the sum of food waste, recycling, and e-waste tonnages by total waste. Aim to increase it by five percentage points in year one. The biggest lever is contamination reduction, not volume increase. A 40% contamination rate means you can raise your diversion rate by sorting better without collecting more.

Check the MRF Residual Rate

The materials recovery facility (MRF) that sorts your commingled recycling has a residual rate, the share of incoming material sent to incineration. The residual rate is the real recycling loss point. If your contamination rate is 40%, the MRF residual rate on your material is likely close to that. Ask your collector for the MRF residual rate on your account. If they do not provide it, ask why. A collector that cannot measure it may be mixing your segregated recycling with general waste for operational convenience, a known failure mode in the Public Waste Collector sector.

Negotiate Collection Costs

The audit reveals your collection cost structure. General waste disposal attracts the incineration gate fee. Recycling collection is cheaper per tonne if the material is clean and the MRF can recover it. Food waste collection is a separate service with its own cost, but it reduces the general waste tonnage. E-waste collection under ALBA's PRS is free for regulated items. The audit lets you rebalance the mix: more clean recycling and segregated food waste, less general waste. The savings offset the cost of the audit within one contract cycle.

Report Under the Resource Sustainability Act

If you are subject to Mandatory Packaging Reporting, use the audit baseline as the starting point for your packaging reduction plan. The RSA requires you to report packaging volumes and a plan to reduce them. The audit gives you the weight of packaging in your waste stream. Compare that against your procurement data to find overpackaged items. The reduction target is not a fixed percentage; it is a commitment you set and report annually. The NEA publishes the waste statistics yearbook each year, your data goes into that pool, and the yearbook is the single authoritative dataset for Singapore's waste system.