A portfolio water plan should connect accounts, meters, end uses, seasonal patterns, leaks, cooling, irrigation, cost, resilience, projects, and verified results.

Set the portfolio boundary and operating objective

Identify the properties, buildings, campuses, ownership entities, management teams, utility territories, water and sewer sources, wells or alternative sources, tenant-paid accounts, reporting requirements, drought or resilience concerns, capital horizon, and decisions the program must support. A compliance dataset, a leak-response program, a capital plan, and a portfolio reduction target may share information but do not require the same scope.

Define which uses and costs the owner can see and influence. Potable, reclaimed, well, harvested, condensate, process, irrigation, cooling, domestic, tenant, and master-metered water should not be blended without a clear boundary. Sewer, stormwater, demand, and other charges can materially affect the financial case even when consumption is unchanged.

Build the account, meter, and end-use map

For each source and account, record utility, commodity or water type, service address, account and meter identifiers, responsible payer, buildings and areas served, read method, units, billing cycle, start and stop dates, estimated reads, sewer treatment, and data-access path. Tie physical meters to the property map and confirm which meters feed others so portfolio totals do not double-count master and submeters.

Inventory significant end uses: restrooms and units, cooling towers, boilers and steam, irrigation, kitchens, laundry, pools, vehicle wash, laboratories, medical equipment, humidification, process loads, water treatment, single-pass cooling, fire-system activity, leaks, and construction. DOE FEMP recommends connecting building and occupancy information with water-consuming equipment when prioritizing metering; the meter plan should follow the decisions the data needs to support.

Establish a usable baseline without flattening the buildings

Review at least the period appropriate to the decision and preserve bill dates, actual versus estimated reads, units, multipliers, adjustments, rate changes, ownership transitions, vacancy, occupancy, weather, irrigated area, cooling degree conditions, construction, major leaks, equipment changes, and known data gaps. Monthly totals can reveal seasonality; interval or submeter data can reveal overnight flow, cycling, short-duration events, or operating schedules.

Portfolio intensity metrics are useful screening signals only when their denominators and boundaries are controlled. A hotel, school, office, hospital, multifamily property, laboratory, and warehouse do not use water the same way. Compare each property with its own history and relevant operating context before using cross-property rankings to direct capital.

Investigate variance by water path and end use

Start with billing and meter reconciliation, then trace unexplained use through overnight or unoccupied flow, toilets and fixtures, distribution leaks, irrigation schedules and weather response, cooling-tower make-up and blowdown, boiler make-up, condensate, pools, kitchens, laundry, process equipment, tenant activity, and other property-specific loads. Check whether the increase is continuous, seasonal, episodic, tied to one meter, or created by a change in data rather than operation.

EPA WaterSense recommends meters and submeters to identify targeted reductions, leaks, and equipment failures. A meter alert should lead to a defined response: who reviews it, how quickly, what operating check follows, when a vendor is engaged, how estimated loss is recorded, and what closes the event. Detection without an accountable response path does not produce durable savings.

Develop measures with operating and water-quality constraints visible

Separate no- and low-cost operating actions, maintenance, fixture or control retrofits, submetering, cooling-tower optimization, irrigation changes, distribution repair, equipment replacement, alternate-water use, and larger capital redesign. Show the affected end use, expected mechanism, quantity, current condition, water and sewer rates, energy interaction, chemical or treatment impact, maintenance, useful life, permitting, health or process constraints, and required design or specialist work.

Cooling-tower water illustrates the need for connected analysis: make-up, evaporation, drift, blowdown, leaks, water chemistry, cycles of concentration, heat-rejection performance, controls, treatment, and equipment condition interact. Increasing cycles without appropriate water-quality and treatment review can create scale, corrosion, or biological risk. The water plan should not select a number in isolation from the system.

Sequence water work with capital, resilience, and operations

Coordinate measures with roof and site work, fixture and unit renovations, HVAC replacement, controls upgrades, irrigation seasons, tenant fit-outs, utility work, cooling-plant projects, boiler work, envelope improvements, and planned shutdowns. Avoid installing submeters that will be abandoned by a near-term project or replacing fixtures without addressing recurring pressure, valve, or distribution conditions.

Include contingency planning for outages, drought, supply interruption, critical process needs, cooling, sanitation, resident or patient needs, and alternate sources where relevant. Resilience priorities should follow the property’s consequence of water loss and recovery path—not a universal portfolio label.

Verify projects and maintain the portfolio record

For each measure, define the baseline boundary, meter or calculation, expected operating conditions, implementation date, commissioning or inspection, normalization needs, acceptance criterion, reporting interval, and responsible person. Compare post-project performance with the appropriate baseline while documenting leaks, occupancy, weather, rate, equipment, or operational changes that affect interpretation.

Maintain one record linking property data, meter inventory, anomalies, corrective work, project assumptions, costs, verified results, and persistence actions. Update the meter map when accounts, tenants, utilities, buildings, equipment, or ownership change. Portfolio reporting should distinguish data completeness, identified opportunity, approved project, implemented work, verified result, and ongoing performance rather than treating them as one “water saved” status.

Primary sources

Sources and technical references.

Source review current as of September 1, 2026.