Water & Sewer Cost Reduction for Multifamily Properties: What Owners Often Miss

For multifamily owners and property managers, water and sewer typically sits among the top operating expenses on a property’s P&L — right behind payroll and insurance in many portfolios. It’s also one of the least scrutinized. Unlike a leasing shortfall or a maintenance backlog, a rising water bill rarely has an obvious cause, so it tends to get absorbed into the budget rather than investigated.

Why apartment communities see this issue often

Multifamily properties generate constant, overlapping water demand: unit-level fixture use across dozens or hundreds of units, common-area irrigation cycles, pool and amenity demand, and building-wide booster pump starts. Every pump start and demand surge introduces turbulence — and often entrained air — into the supply line, right before it passes through the property’s meter.

Water meters register volume, not composition. They can’t tell the difference between a gallon of water and a bubble of air moving through the measurement chamber, so the meter counts both as billable usage.

Signs worth checking in your portfolio

• Bills rising without a corresponding increase in occupancy — if your units are filled at a stable rate but utility cost keeps climbing, that’s a pattern worth investigating rather than assuming it’s simply a rate increase.
• Sewer charges tracking water charges closely — since sewer fees in most municipalities are calculated from metered water intake, an over-reading meter inflates both bills by the same margin, effectively billing the error twice.
• Cost per unit above comparable properties in your portfolio — if you own or manage multiple communities, a persistent gap in water cost per unit between otherwise similar properties is a useful diagnostic.
• Water audits that confirmed usage but found no leaks or fixture issues — this is a common dead end for property teams, since a standard leak audit doesn’t typically test for meter accuracy.

A correction that doesn’t touch your units

Unlike a fixture retrofit program, which requires coordinating access to individual units, a Flow Conditioning Device (FCD) installs once, at the property’s meter, upstream of all internal distribution. It corrects the turbulence and air entrainment causing the over-count without any need to enter a single unit or disrupt residents. Installation takes approximately one hour with water off, performed by a licensed plumber or mechanical contractor.

Documented FCD installations show an average 5–30% reduction in combined water and sewer costs (highest documented: 46%), and roughly 90% of installations reach full payback in under 12 months — backed by a 6-month money-back guarantee, so the downside of investigating is limited.

For an instant, facility-specific estimate, try the free savings calculator — 30 seconds, no contact information required. More detail on how the FCD applies to multifamily properties specifically is available on our multifamily industry page.