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To fix excessive water use in a data center cooling tower, first measure makeup water, blowdown and conductivity; then find out whether the tower is bleeding too much, losing water through leaks or drift, or operating at a chemistry-limited cycle of concentration. Evaporation is how an evaporative tower rejects heat, so trying to eliminate it without changing the cooling design is the wrong first move. The U.S. Department of Energy’s Federal Energy Management Program (DOE FEMP) identifies carefully controlling blowdown as the most significant cooling-tower water-conservation opportunity. Its Best Management Practice #10 says increasing cycles of concentration from three to six reduces makeup water by 20% and blowdown by 50%.
Start with meters and a water balance—not a new reverse-osmosis plant or a dry-cooling redesign. The steps below explain how to diagnose the losses, raise cycles safely, and decide when larger upgrades make sense. U.S. federal guidance is the primary operating reference; discharge permits, sewer credits and Legionella requirements depend on local rules.
Where does a data center cooling tower’s water go?
In a typical evaporative data center plant, heat moves from IT equipment through room cooling equipment and chilled water to a chiller, then into a condenser-water loop and the cooling tower. At the tower, water evaporates into the air and carries heat away. Because data centers often run continuously, their cooling towers can have a year-round evaporative load rather than the seasonal pattern of many office HVAC systems.
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Water leaves the tower through evaporation, blowdown, drift, and leaks or overflows. The water balance is:
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Makeup = evaporation + blowdown + drift + leaks and overflows.
If drift and leaks are negligible, makeup is approximately evaporation plus blowdown. Evaporation is the cooling process; blowdown is the principal controllable discharge. Blowdown—also called bleed—is water drained from the circulating system to limit the concentration of dissolved minerals and other contaminants. Without it, scale, corrosion and fouling can threaten the tower and condenser tubes.
The U.S. EPA’s Water Efficiency Management Guide: Mechanical Systems (2017) gives an approximate evaporation rate of 1.8 gallons for every ton-hour of cooling, regardless of cooling-tower operating efficiency. EPA’s WaterSense at Work (2012) also gives a rule of thumb: evaporation is typically about 1% of recirculating-water flow for every 10°F of temperature drop. These are estimation aids, not a plant-specific water-use target. Higher heat load generally means more evaporation.
Drift is liquid water droplets carried out of the tower by airflow. EPA reports drift losses can range from 0.05% to 0.2% of cooling-tower flow; modern drift eliminators can reduce them to less than 0.005%. A healthy tower should not have unexplained drift or leakage. Drift also matters for public health because it is an aerosol pathway, so reducing it is not merely a water-accounting exercise.
Cooling towers can be a substantial share of a facility’s water demand: EPA’s 2012 WaterSense at Work says they often account for 20% to 50% or more of water use in institutional and commercial applications. That figure is not a data-center-specific benchmark. Likewise, a facility’s total makeup should not be judged against a single universal gallons-per-megawatt figure: heat load, climate, tower design, water chemistry and operating practice all affect it.
What does cycles of concentration mean?
Cycles of concentration (CoC) describe how concentrated dissolved material becomes in the circulating tower water compared with the makeup water. A common approximation is:
- Conductivity CoC = conductivity of blowdown or basin water ÷ conductivity of makeup water.
- Volume CoC = makeup-water volume ÷ blowdown-water volume when drift and other losses are negligible and the water balance is understood.
Conductivity is a practical proxy for dissolved ions, not a complete analysis of every constituent. The two CoC calculations should broadly agree when the meters work and the assumptions hold. EPA advises investigating possible malfunctions if the volume-based result is more than 10% higher than the conductivity-based result. Leaks, overflow, excessive drift or an unaccounted water draw can explain that gap.
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In simplified terms, higher CoC means the water can circulate longer before a portion must be discharged. It can reduce blowdown substantially, but it does not make evaporation disappear. A common mass-balance approximation is blowdown ≈ evaporation ÷ (CoC − 1) − drift; actual operating calculations should account for measured losses and the tower’s design.
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Why is my cooling tower using so much makeup water?
Check the causes in this order: too much blowdown, unaccounted losses, faulty conductivity control, unsuitable makeup-water chemistry, higher-than-expected heat load, and any remaining single-pass cooling. The first few causes account for many high-makeup complaints and are usually more practical to address than replacing the heat-rejection system.
- Cycles are too low. A timer-based bleed or an overly conservative manual setting may discharge water before it needs to be removed. DOE says systems commonly run at two to four cycles, even though higher cycles may be possible. A timer can also behave poorly as conditions change: a fixed schedule may waste water during some operating conditions and allow excessive concentration between discharge pulses in others.
- There is a leak, overflow or unauthorized draw-off. A basin leak, a stuck level-control valve or a poorly controlled overflow can make makeup exceed the heat-load balance. Check the basin, fill valve, overflow and connected drains; also confirm that no other process is drawing from the loop.
- Drift is above design. Inspect for drift eliminators that are damaged, fouled, displaced, missing or unsuitable for the tower. Airflow and water loading outside the manufacturer’s operating envelope can also undermine performance. Do not treat high drift as a harmless small loss.
- The conductivity probe or controller is unreliable. A fouled or uncalibrated probe can produce misleading readings. Depending on the failure, the controller may under-bleed and let concentration rise, or over-bleed and waste water. A displayed reading is not proof that the probe is accurate.
- Water chemistry limits safe cycles. Hardness, alkalinity, silica, chlorides, sulfate and total dissolved solids (TDS), among other constituents, can limit how far cycles can rise. Reclaimed makeup can have higher TDS, silica or nutrients than the plant’s previous supply, so a program designed for municipal water may no longer be suitable.
- The tower is rejecting more heat than expected. Rising IT load, dirty air-handler coils, poor air management or a failed economizer can increase the heat the plant must reject. DOE data-center guidance identifies air management, space temperature and humidity, and air- or water-side economizing as potential ways to reduce cooling demand and its associated water use.
- Single-pass cooling remains in the system. EPA’s 2017 mechanical-systems guide says single-pass cooling uses about 40 times more water to remove the same heat load than a cooling tower operating at five cycles of concentration. Identify and eliminate such use where feasible rather than trying to compensate elsewhere.
How should I measure the water balance?
Make measurement the first job, before changing the blowdown setpoint. The most useful initial readings are makeup flow, blowdown flow, makeup conductivity and basin or blowdown conductivity. DOE FEMP and EPA guidance support monitoring these quantities to understand and manage tower operation.
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- Read or install flow meters. Measure makeup and blowdown separately. If either stream is unmetered, the site cannot reliably distinguish expected evaporation from blowdown or unexplained loss.
- Measure both conductivities. Use permanent probes if present and functioning. If the tower has no permanent conductivity meter, EPA’s WaterSense at Work recommends using a handheld conductivity meter. Take readings under stable operating conditions and record which stream each reading represents.
- Log the readings together. Record makeup quantity, blowdown quantity, conductivity of makeup and basin/blowdown water, and the resulting CoC calculations. Trend the data rather than relying on one isolated reading; operating load and water conditions vary.
- Check the fill valve and overflow. Confirm the basin fill valve shuts off cleanly at the intended level, and inspect for continuous overflow, leakage or unintended withdrawals.
- Compare the two CoC estimates. Calculate a conductivity ratio and a volume ratio. If volume CoC is more than about 10% above conductivity CoC, treat it as a loss investigation—look for leaks, overflow, excessive drift or other unmetered discharge—rather than assuming a chemistry problem.
- Ask the water utility about sewer billing. DOE FEMP notes that a site may qualify for sewer credits for evaporative losses, using metered makeup minus metered blowdown as a basis. Eligibility and calculation vary by utility. A sewer credit can reduce charges; it does not reduce the volume of water consumed.
A water balance is also a reality check. If measured makeup is far above evaporation plus measured blowdown, drift and leaks deserve attention. Do not assume every unexplained gallon can be saved by raising CoC; first establish where it is going.
How do I reduce cooling-tower blowdown safely?
Set the highest cycle of concentration that the tower’s makeup chemistry, equipment and treatment program can safely support, then use automatic conductivity control to hold it. A timer is not a substitute for measuring concentration. Have a qualified water-treatment specialist assess current makeup chemistry before raising the operating limit.
Ask for a current analysis of hardness, alkalinity, silica, chlorides, sulfate, TDS or conductivity, pH, iron and, where relevant, phosphate or other constituents from reclaimed water. The treatment specialist should consider tower materials and condenser requirements, not conductivity alone. Translate the selected CoC into an appropriate conductivity setpoint in microsiemens per centimeter (µS/cm) for the actual makeup water.
A conductivity controller continuously measures circulating-water conductivity and opens the blowdown valve when the setpoint is exceeded. DOE FEMP describes this approach as discharging water only when conductivity passes the setpoint. The controller and probe still need maintenance: clean and calibrate the probe on a planned schedule, verify readings with a handheld meter, and check that the valve responds properly. A controller cannot compensate for a probe that has quietly drifted out of calibration.
Do not adopt a universal setpoint from another facility or a generic table. Industry guidance describes roughly four to six cycles as common practice on standard municipal makeup, and four to eight or more at some data-center towers with an appropriate treatment program. Those ranges are not official limits and do not establish what a particular site can safely run. Hardness, silica, corrosion risk, discharge restrictions and reclaimed-water quality can all change the answer.
Vendor guidance describes silica around 150–180 mg/L in basin water as a commonly treated ceiling, and notes that softening or RO may allow higher cycles than untreated hard makeup. These are engineering reference points, not universal regulatory limits. Silica chemistry and treatment practice vary; use a site-specific analysis and treatment vendor recommendation rather than aiming for a number in isolation.
A vendor comparison shows makeup savings versus once-through cooling increasing from 67% at three cycles to 83% at six and 88% at eight, while the blowdown share of evaporation falls from 50% at three cycles to 20% at six and 14% at eight. This illustrates why each additional cycle generally saves less than the earlier increase, while scale, corrosion and discharge risks can continue to grow. It is not a substitute for an actual plant calculation.
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One vendor’s 2026 industrial estimates put timer-based bleed hardware at about USD 200–600, with 15–35% extra water, and conductivity control at USD 1,200–4,500, with 3–8% extra water and a 6–18 month payback where water costs exceed about USD 1.00/m³. These are vendor estimates, not DOE figures or guaranteed savings; installed cost, tariffs, site conditions and baseline controls determine actual economics. The practical point is to compare the cost of control with the measured cost of excess blowdown, not to assume a payback.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsWhat treatment is needed to run higher cycles?
Higher cycles are safe only when the treatment program is matched to the makeup water and the tower’s materials. A typical program addresses scale, corrosion and biological growth; changing the bleed rate without rechecking those controls can trade a water saving for equipment damage or a health risk.
- Antiscalant or dispersant: helps keep scale-forming minerals and suspended material from depositing as concentration rises. pH and alkalinity control may also be needed.
- Corrosion inhibitor: protects the tower and connected equipment, including systems with mixed metallurgy such as steel, copper alloys and galvanized components.
- Biocide: controls biofilm and microbial growth in warm, aerated water. Programs may use an oxidizing residual plus periodic non-oxidizing treatment, as appropriate to the system and applicable rules.
Do not combine conflicting vendor targets into one universal chemistry specification. For example, one vendor engineering guide gives a target of roughly −0.5 to +0.5 for the Langelier Saturation Index (LSI), while another vendor source describes a different target band. LSI is one indicator of scaling or corrosive tendency, not a stand-alone operating rule. The right target depends on chemistry and metallurgy and should be set with the treatment specialist.
New galvanized towers need particular care: the cited water-treatment guidance recommends an initial passivation period at controlled pH, around 6.5–7.0 with adequate hardness, to help form a protective zinc carbonate film. Immediately applying a high-pH, high-cycle program can contribute to white rust. Follow the tower and treatment suppliers’ commissioning instructions.
Water conservation does not override Legionella prevention. In the United States, ASHRAE Standard 188 provides a framework for a building water-management program; the facility should apply its requirements and applicable local rules. Maintain appropriate biological control, limit stagnant zones, control drift, and observe required monitoring and response procedures. Blowdown changes must also respect discharge limits, including any permit requirements for treatment residuals. Never reduce biocide feed or delay necessary treatment merely to save water.
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DOE FEMP advises evaluating treatment vendors on the cost to treat 1,000 gallons of makeup and the highest recommended system CoC, rather than chemical volume sold. Ask for the basis of any proposed maximum cycle, the monitoring plan, expected residuals, probe calibration schedule and how the program will change if the makeup source changes.
What should I inspect when makeup exceeds the water balance?
If the two CoC ratios disagree materially or makeup is still higher than the measured heat-load balance predicts, inspect and correct physical losses before buying treatment equipment. The goal is to find the stream that is leaving the system without being counted as expected evaporation or controlled blowdown.
- Drift eliminators: confirm they are the correct type, correctly installed, intact, clean and not displaced. Check for bypass paths and compare airflow and water loading with the tower manufacturer’s operating envelope.
- Basin and distribution piping: inspect for visible leaks, wet areas and abnormal drainage. Check joints and connected lines for unintended draw-off.
- Level controls and fill valve: verify that the float or other level-control device shuts off at the right level and does not stick open. Confirm overflow alarms and shutoffs function.
- Unmetered uses: trace any branch, drain or auxiliary process connection that could be taking water from the tower loop or makeup supply.
- Probe and control loop: compare the installed reading with a handheld conductivity measurement, then check calibration, wiring, controller logic and blowdown-valve operation.
Fixing leaks and overflows should reduce makeup toward the water-balance expectation. If the gap persists, continue tracing the flow paths and validate the meters. Replacing a probe without checking a stuck valve, or raising cycles to mask a leak, can leave the underlying problem—and its cost—untouched.
Which upgrades can increase the safe cycle limit?
If the site is already metered, leaks are controlled and blowdown follows a sound conductivity setpoint, water chemistry may be the next constraint. Choose pretreatment based on what the analysis identifies as limiting; filtration, softening and reverse osmosis address different problems.
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- Sidestream filtration removes suspended solids from circulating water and can help on dusty sites or where basin solids contribute to fouling. DOE identifies filtration as a potential retrofit. A vendor guide gives 5–15% of recirculating flow as a typical sidestream filtration range; it is not a universal design specification. Filters require maintenance and do not remove dissolved hardness or silica in the way softening or membranes can.
- Softening can help when calcium and magnesium hardness limits cycles. Makeup or sidestream softening may be considered, depending on the system and treatment plan. It does not remove every dissolved constituent, so check what actually constrains the tower before selecting it.
- Reverse osmosis (RO) of makeup can reduce dissolved solids and silica and may allow higher cycles. It adds capital and operating costs and produces reject water that needs a suitable disposal or reuse path. DOE includes RO among federal data-center cooling-water options; the value depends on makeup chemistry, water and wastewater tariffs, and the achievable cycle increase.
- Alternative makeup can include air-handler condensate, compatible process effluent or suitable recycled municipal water. Condensate is often low in minerals and may be available when cooling demand is high, but quantity and quality vary. Retiring a once-through use can also create a potential reuse source. Test any alternative supply and redesign the treatment program for it.
- Automated chemical feed can pace treatment to makeup flow or real-time measurements. DOE recommends automated feed for larger towers, including systems above 100 tons. Automation is useful only when the sensors, calibration and treatment logic are maintained.
For reclaimed makeup, do not assume an existing municipal-water treatment program remains suitable. Higher TDS, silica or nutrients can reduce achievable cycles and affect scale and biological control. Analyze the source and revise pretreatment and treatment before increasing the setpoint.
When does blowdown recovery make sense?
Consider recovering blowdown after the site has reduced avoidable bleed and already operates at a chemistry-safe CoC. Blowdown is concentrated and chemically treated, so recovery typically needs treatment such as filtration followed by membranes or other separation processes, plus a plan for the concentrated reject.
Recovery is more plausible where blowdown volumes, water and wastewater costs, discharge constraints, WUE targets, available space and operating capacity justify the complexity. A small or poorly metered plant should not make it the first project. Measure the remaining discharge, identify a safe reuse destination and confirm permit requirements before choosing a recovery process. Treating blowdown without a disposal plan for the reject does not solve the whole water problem.
What if the site needs to reduce evaporation itself?
Once leaks, drift and over-blowdown are under control, reducing evaporation means reducing the heat the tower must reject or changing the heat-rejection design. EPA’s approximate 1.8 gallons per ton-hour explains why ordinary tower tuning cannot eliminate this water demand.
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- Use water-side economizing when climate allows: suitable conditions may allow the plant to reduce chiller use and alter tower operation. The opportunity depends on local wet-bulb conditions and plant design.
- Consider hybrid or adiabatic equipment: wet-dry approaches may reduce seasonal evaporation, but results depend on climate, operating hours and design. Verify site-specific water and energy impacts rather than relying on a generic savings claim.
- Consider dry heat rejection: air-cooled or dry-cooler designs can approach zero on-site cooling-water use, but generally shift the trade-off toward energy, equipment size, cost and climate suitability. This is usually a plant-design or new-build decision, not a bolt-on tower repair.
- Evaluate liquid cooling with dry heat rejection for major redesigns: direct liquid or immersion approaches can change how heat is carried away, but converting a facility is a capital and infrastructure program. Microsoft announced a next-generation chip-level liquid-cooling design in December 2024; a secondary account reports Microsoft’s claim that it avoids more than 125 million liters of water per year per data center. That is a company-reported new-design claim, not a measured retrofit result or a promise for an existing tower.
Any comparison should weigh water, energy, capital expense, reliability, climate and project timing together. A near-zero-water design is not automatically the best operating choice at every site.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should a data center track the result?
Track tower makeup and blowdown separately, alongside conductivity, calculated CoC, heat load and any relevant treatment readings. This makes it possible to tell whether a water reduction came from less avoidable blowdown, repaired losses, lower cooling demand or a change in heat-rejection design.
DOE FEMP defines data-center water usage effectiveness (WUE) as:
WUE = annual site water usage (liters) ÷ IT equipment annual energy use (kWh).
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallSubmeter tower makeup if the aim is to evaluate tower performance. A whole-campus water total can obscure the effect of a cooling-tower project, especially when other building uses change. Define the site-water boundary consistently when comparing WUE over time.
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Published estimates can illustrate scale, but they are not universal targets. A secondary 2026 account citing the Lawrence Berkeley National Laboratory’s 2024 U.S. Data Center Energy Usage Report says U.S. data centers directly consumed about 66 billion liters (roughly 17 billion gallons) in 2023, with hyperscale and colocation facilities accounting for 84% of the total. The LBNL figure is cited secondarily here, so treat it as context rather than a site benchmark. A secondary citation also attributes an estimate of about 6.75 million gallons per year to a 1-megawatt data center using traditional chiller and cooling-tower systems. That figure is not a universal per-megawatt allowance.
As an arithmetic illustration rather than a surveyed average, applying EPA’s 1.8 gallons per ton-hour factor to a one-megawatt example yields roughly 4.5 million gallons per year of evaporation. At four cycles, the cited illustration estimates about 1.5 million gallons of blowdown and 6 million gallons of total makeup, with roughly three-quarters of makeup evaporating. Actual results depend on load profile, weather, equipment and water chemistry.
Which fix should I do first?
Use the measured cause to choose the intervention. For most existing plants, the sensible order is to make the water balance visible, repair unaccounted losses, control blowdown, and only then invest in pretreatment or recovery.
| Option | What it fixes | Water effect | Main risk or limitation | Typical first use |
|---|---|---|---|---|
| Conductivity-controlled blowdown plus meters | Over-bleeding and lack of visibility | Potentially large when a tower is at unnecessarily low cycles | Probe fouling or a setpoint beyond the chemistry limit | Any evaporative plant without reliable measurement and control |
| Leak, overflow and drift repair | Unaccounted losses | Moves makeup closer to the heat-load balance | Eliminator damage or hidden draw-off can be missed | When CoC ratios disagree or makeup exceeds expectations |
| Treatment program for higher CoC | Scale, corrosion and biological constraints | Enables lower blowdown at a safe higher cycle | Legionella control and discharge residual requirements | Whenever the operating cycle is raised |
| Softening or makeup RO | Hardness, TDS or silica limits | May enable higher cycles and less blowdown | Capital, energy, softener salt or RO reject | When analysis shows makeup quality is the binding constraint |
| Sidestream filtration | Suspended solids and fouling | Indirect; can support more reliable operation | Filter maintenance; does not resolve all dissolved minerals | Dusty sites or dirty basins |
| Blowdown recovery | Remaining treated discharge after optimization | Recovers a portion of the residual bleed | Complexity, reject handling, space and uptime | Large sites with favorable costs or discharge constraints |
| Hybrid, dry or liquid-cooling redesign | Evaporation itself or the heat-rejection pathway | Can greatly reduce on-site cooling-water use | Energy, capital, climate and project-timing trade-offs | New halls or major redesigns, especially under water pressure |
How to prioritize: start with metering because every later decision depends on knowing what the tower consumes. Repair leaks, overflow and drift, then replace unnecessary timer-based bleed with conductivity control at a chemistry-safe setpoint. Improve water quality or add filtration only when analysis identifies the constraint; consider blowdown recovery after avoidable discharge is gone. Redesign heat rejection only when the site’s water goals and long-term investment case justify it.
Frequently Asked Questions
How often should I check cooling tower conductivity?
No universal checking interval is specified for every plant. Set the frequency in the site’s operating and water-treatment plan, and verify permanent-probe readings with a handheld meter on a schedule appropriate to the probe, water quality and operating risk.
Can cooling tower water be discharged into the sewer?
That depends on the local sewer authority, discharge permit and the water’s treatment residuals and quality. Confirm limits and any required sampling or pretreatment with the relevant authority before changing blowdown or recovery practices.
Does higher cooling-tower WUE always mean worse efficiency?
WUE is a ratio of site water use to IT energy, so it can shift when either the water boundary or IT energy changes. Compare like-for-like periods and clearly state whether the figure includes only tower makeup or broader campus water use.
Can I use rainwater or recycled water as cooling-tower makeup?
Potentially, if its availability, quality and treatment needs suit the tower and the use complies with local rules. Test for dissolved solids, hardness, silica and biological concerns, then revise the chemistry program rather than assuming the current makeup-water settings will work.
