Supermarkets combine refrigeration condensate recovery opportunities, produce misting systems, food preparation water use, and HVAC cooling systems in a single complex water-cost profile. WST audits, recovers overcharges, and monitors across all systems for grocery retailers and supermarket chains.
The Challenge
The most significant water cost opportunities in supermarkets are not visible in a standard utility bill review — they require understanding of refrigeration condensate volumes, produce misting specifications, and HVAC make-up water classification.
Refrigerated display cases in a typical supermarket generate 3–8 gallons of condensate per case per day — water that is essentially distilled quality and is typically sent straight to the floor drain. In a 50-case supermarket, that's 150–400 gallons per day of potable-quality water disposed as waste. Where local plumbing codes permit, condensate recovery for use in produce misters, ice machine fill, or landscape irrigation reduces both water consumption and the drain charges associated with disposal.
Produce misting systems set to fixed timers continue to run when produce density is low, refrigeration cases are empty overnight, or ambient conditions don't require moisture replenishment. Misting systems optimised to run based on produce temperature and weight rather than fixed schedules typically reduce misting water consumption by 20–35% without any change in produce quality or shelf life.
Supermarkets with multiple rooftop HVAC units have a collective cooling make-up water consumption that often exceeds the produce misting and food preparation water combined. Sewer charges on rooftop HVAC make-up water are a common overcharge category — and with supermarkets operating in leased spaces, the billing structure is often the landlord's responsibility without the tenant ever reviewing it.
WST Approach
Typical Outcomes
| Metric | Outcome |
|---|---|
| Refrigeration condensate recovery (typical) | $5–15K/yr per store |
| Produce misting optimisation | 20–35% reduction |
| HVAC sewer exemption recovery | $8–20K/yr per location |
| Billing error rate (multi-site chain) | 8–12% of total bill |
| Chain-level annual saving | $15–40K per location |
| Upfront cost | Zero — shared savings |