The case for water

Is Water Worth an Engineer's Time?

A plain look at the dollar magnitude of a water ECM: what it's actually worth relative to the rest of a comprehensive ESPC, and why the industry's own numbers suggest it's been under-scoped for years.

1. The honest starting point: water is usually the smaller line item

No credible case for adding water starts by claiming it rivals a lighting or mechanical retrofit in absolute dollars on a typical comprehensive project. It usually doesn't, and pretending otherwise would undercut the rest of this argument. The real question for an engineer deciding whether it's worth the scoping time isn't "is it the biggest ECM," it's "is it big enough, with a short enough payback, to be worth the hour it takes to find out." The industry's own data says yes, consistently, by a wide margin.

2. The industry has been pricing water at a fraction of what it's worth

LBNL's ESCO industry surveys have found that consulting, operations and maintenance, and water conservation work combined accounted for roughly 5% of ESCO industry revenue historically, a category so small it's grouped with several others rather than broken out on its own. That's a revenue share, not a savings-potential share, and the gap between the two is the opportunity. EPA's own WaterSense program estimates that of the roughly 27 million flushometer-valve toilets installed in the U.S., about 7 million (26%) are running at 3.0 to 7.0 gpf instead of the 1.6-gpf federal standard they were installed to meet. That's not a marginal, hard-to-find population; it's more than a quarter of the entire national installed base, sitting in exactly the public and institutional buildings ESCOs already have under contract for lighting and HVAC work.

3. What a real water scope has actually delivered

Rather than project a national average project size (water ECM scope varies too much by building type and fixture count for a single number to mean much), it's more useful to look at what one documented recommissioning project actually returned. A 126-fixture flushometer recommissioning project cost $32,000, cut total building water use 15%, and saved $22,800 a year: a 1.4-year payback. That works out to roughly $254 of project cost per fixture corrected, for a measure that paid for itself in under a year and a half. For comparison, LBNL's project-level database puts typical ESCO investment across all measure types at roughly $2.30 per square foot of facility area. That benchmark gives a sense of scale, though a water scope should be sized fixture-by-fixture from an actual audit, not backed into using a square-footage rule of thumb the way a lighting retrofit often is.

Scaled with that per-fixture cost as a rough planning reference, a mid-size elementary or middle school with 40–60 water closets, urinals, and lavatories in scope lands in the $10,000–$15,000 range for a recommissioning-focused water package. That's real money, delivered at a payback most other measures on the ECM list can't match, but appropriately sized as a supporting measure rather than a project centerpiece. A high school or a multi-building campus scope scales up from there in direct proportion to fixture count, which is exactly why a fixture-count audit, not a square-footage estimate, is the right way to price it before it's dismissed as too small to bother with.

4. Why the payback matters more than the size

A measure's value to a comprehensive ESPC isn't just its dollar size; it's what that size does to the rest of the contract. As covered in our companion research on the ESCO water market, DOE's Federal Energy Management Program explicitly recommends bundling short-payback water measures into a performance contract specifically because they help carry longer-payback measures that couldn't qualify on their own. Federal ESPC rules formalize this by requiring the contract as a whole, not each individual measure, to meet the applicable payback threshold. A $10,000–$15,000 water package with a sub-two-year payback is disproportionately useful to that blended calculation: cheap insurance for the parts of the project with a much longer runway to pay for themselves.

5. The one-hour question

None of this requires an engineer to treat water as a major scope item on every project. It requires treating it as worth the same field-audit hour already spent walking a mechanical room or a lighting count, because the industry's own revenue data suggests that hour has been skipped far more often than the underlying opportunity justifies, and the national installed-base numbers say the fixtures worth finding are sitting in the building already under contract.

← Back to all water insights