Restaurants are among the most water-intensive commercial uses per square foot — kitchen equipment, dishwashing, ice machines, and grease trap compliance all driving significant water cost. WST audits, recovers overcharges, and monitors consumption for restaurant groups and QSR operators.
The Challenge
Restaurant water management is almost never systematically audited. The result is a collection of small, persistent overcharges and waste events that compound across every location in a multi-site portfolio.
Commercial kitchen equipment — particularly pre-rinse spray valves, dishwashers, and ice machines — vary enormously in water consumption based on age, calibration, and maintenance condition. A pre-rinse spray valve running at 1.6 GPM instead of the WaterSense standard of 0.5 GPM wastes over 1,000 gallons per shift. Across a 50-location restaurant group, that's a six-figure annual waste before any other system is examined.
Many municipalities apply elevated sewer surcharge rates to food service establishments based on estimated FOG (fats, oils, and grease) load. The surcharge rate applied is often based on a generic category classification rather than the actual monitored discharge of the specific location. Restaurants that have invested in grease trap management and can document lower-than-average FOG loads may be entitled to reclassification — but almost never apply for it.
Multi-site restaurant operators typically have utility bills processed through accounts payable without any forensic review. Rate misclassifications, estimation errors, and tier calculation issues at individual locations are never visible in aggregate expense reporting. WST's portfolio-level billing review identifies the specific locations with anomalous consumption patterns and targets the audit effort accordingly.
WST Approach
Typical Outcomes
| Metric | Outcome |
|---|---|
| Kitchen equipment water reduction | 15–30% |
| Sewer reclassification saving | $5–20K/yr per location |
| Billing error recovery (multi-site) | 8–12% of total bill |
| Pre-rinse valve upgrade payback | 3–6 months |
| Portfolio-level audit timeline | 30–45 days |
| Upfront cost | Zero — shared savings |
Multi-site operators benefit most from WST's portfolio billing review — the aggregate error rate across 20+ locations typically yields more value than any single-site audit.