Capital decision · Compliance · New York City, New York State and New Jersey

Cooling Towers & Water

A tower carries the Legionella rules, the largest water bill in the plant and the chiller's condenser-water temperature at once.

Before anyone repairs, replaces or removes a cooling tower, the building should know what the tower is doing for the chiller, what its water costs, and which rules reach its address. The rules differ by state and by city; every claim on this page says which one it describes.

Send the building details →Read the full explanation

Checked October 28, 2026. New York City's amended rules took effect May 8, 2026; New Jersey's water management deadline is December 12, 2026.

The decision first

Repair, replace or remove: prove what the building needs before the quote is signed.

A tower decision made on compliance alone, water alone or energy alone usually gets the other two wrong. The evidence for the right one already exists in the building.

Observe

Read the approach the tower is holding against its design (leaving condenser-water temperature minus entering wet bulb; a common design point is 85°F water at a 78°F wet bulb, a 7°F approach). Pull a season of chiller kW against condenser-water temperature. Take makeup and blowdown from the meter, not the treatment contract. Collect the last three years of Legionella, inspection and certification records.

Decide

Compare repair, replacement in kind and removal on three columns together: water cost, chiller energy and the compliance load at this address. Most water-cooled chillers are designed for entering condenser water at or below 85°F; air-cooled equipment removes the tower's obligations and its water use, and also removes the low condensing temperatures a tower makes possible. Whether that trade pays depends on the building's load profile.

Act

Make the approved choice and write the compliance consequences into the scope: registration changes, a rewritten maintenance plan, startup sampling, or deregistration and final disinfection. If an incentive depends on the equipment, the utility's approval comes before purchase.

Verify

Trend the approach and chiller kW after the work, confirm the first culture results and reports landed on time, and name who owns the plan from here on.

PHOTO PLACEHOLDER: Rooftop cooling tower
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Rooftop cooling tower

Three regimes, not one

Which rulebook reaches the tower depends on the address.

New York City, the rest of New York State and New Jersey each regulate towers differently. The tiles below are separate on purpose.

NYC

New York City: 24 RCNY Chapter 8, amended May 8, 2026

TestingLegionella culture at least every 31 days while operating, by a NYS ELAP-accredited lab (Local Law 159 of 2025, effective May 7, 2026).
MonitoringRoutine monitoring documented at least weekly; a compliance inspection documented at least every 90 days.
PlanMaintenance Program and Plan certified annually by a qualified person, with a valve schedule and low- and no-flow provisions.
ReportsShutdowns and startups reported within 5 days; startup sample within 3 to 14 days; test dates within 5 days; annual certification by November 1.
RecordsAt least 3 years, produced on request, electronic records shown on an owner-supplied device at inspection.

NYC enforcement in 2026 →

NYS

New York State outside the City: 10 NYCRR Subpart 4-1

ReachWestchester, Long Island and upstate. Any cooling tower, evaporative condenser or fluid cooler, no size threshold.
TestingLegionella culture at most every 90 days; bacteriological sampling at most every 30 days; inspection at most every 90 days.
CertifyAnnual certification by November 1 by a NYS PE, certified industrial hygienist, certified water technologist, environmental consultant or ASHRAE 188-trained water-treatment professional.
PenaltyNo State dollar figure; "all civil and criminal penalties as provided for by law," each day a separate violation.
StatusNot amended as of October 28, 2026. Bill S8472 (biannual certification) is pending, not enacted.

New Jersey: P.L. 2024, c.66 water management programs

ReachNo tower registry, cadence or certification. A building with an open- or closed-circuit cooling tower or evaporative condenser serving HVAC or refrigeration must have a written ASHRAE 188 water management program for that device.
DatesProgram developed by September 12, 2026 (passed); implemented and a public notice posted by December 12, 2026. Both come from the statute itself.
SamplingMandatory only for hospitals, care facilities and outbreak buildings; "may" for a commercial tower. NJDOH recommends testing at least every three months while operating.
PenaltyUp to $2,000 first, $5,000 after, $10,000 where a violation causes serious injury or death.
RulesDOH and DEP rules were due September 12, 2026; none proposed as of October 28, 2026. Rules may still add a cadence, a registry or a credential.

The New Jersey page →

New York City in 2026

Two outbreaks in one summer changed what inspection looks like.

This section applies inside the five boroughs. The figures are the Health Department's own.

800

Field inspections since May 8, 2026

More than 460 found at least one violation; $80,500 in fines paid (Mayor's Office and DOHMH, September 1, 2026).

81%

Towers compliant with monthly testing, citywide

As of late August 2026. In the Upper East Side cluster area, compliance rose from 73% to 92% during the response.

Cases in the Upper East Side cluster

Summer 2026, ZIP codes 10028, 10075 and 10128; 11 deaths as of August 31. 183 towers sampled, 59 positive for live Legionella, 83 buildings ordered to disinfect.

Cases in the South Bronx cluster

September 2026, ZIP codes 10451 and 10456; 1 death; 24 towers tested, 10 PCR-positive and disinfected. Eight of the ten had met the 31-day testing rule.

What the City announced on September 1, 2026

The cooling-tower registration portal will be linked to the Department of Buildings' permitting system by the end of 2026, so a new tower cannot start up unregistered. A public citywide map of registered towers with each tower's inspection and sampling history is planned for spring 2027. Hearings on summonses will be scheduled 15 days after service, the earliest the rules allow. A scientific advisory panel is to report within a year. None of this changes the owner's legal duties; it changes how quickly a gap is found.

Penalties come from two places. The statute (Admin. Code §17-194.1) caps civil penalties at $2,000 for a first violation and $5,000 for a second or later one; $10,000 applies only to a violation involving death or serious injury; violating an abatement order is a misdemeanor punishable by up to $25,000 and a year. The Health Department's own schedule (24 RCNY §8-09, amended May 8, 2026) sets $2,000 (first) and $4,000 (repeat) for no maintenance plan, no annual certification, Legionella sampling or reporting failures, nonpotable makeup water without an approved plan, aerosol control and failure to take corrective action; $1,000 and $2,000 for most monitoring, maintenance, treatment and recordkeeping violations; $500 and $1,000 for late shutdown, startup, operating-period and test-date reports. During the Upper East Side response one unregistered tower drew 11 violations and $11,000. Vendor summaries that quote a single five-figure fine for one missed test conflate the statute with the schedule; neither says that.

Removal

Taking the tower out ends some duties and not others.

"Remove the tower and the compliance problem disappears" is true only when the tower was the building's only covered device, and it says nothing about what the chiller does without 85°F condenser water.

What removal ends

NYCChapter 8 duties end when the tower is deregistered with the City and the State. A final cleaning and disinfection before decommissioning is the responsible close-out; the shutdown is reported within 5 days like any other.
NYSSubpart 4-1 duties end with State deregistration.
NJIf the tower was the only listed device, the c.66 program has nothing left to cover.

What removal does not end

NYCThe Plumbing Code (§428.1.1) bars potable water for once-through cooling, so the replacement is air-cooled or another recirculating system. A pre-2011 single-pass system can be grandfathered but never replaced in kind.
EnergyAir-cooled condensing runs hotter on summer afternoons; the chiller energy case has to be worked out, not assumed.
NJA spa, indoor fountain, humidifier or covered central hot-water system keeps the c.66 program alive for those devices.

Replacement in kind

NYCThe new tower is registered, cleaned and disinfected before operation, filled from the municipal supply unless a nonpotable plan is approved, sampled within 3 to 14 days of startup, and its plan rewritten and certified. The compliance load does not change.
NYSRegistration updated, plan rewritten, cadence unchanged.
NJThe program is updated for the new device; new or repurposed buildings must confirm the program before commissioning.

PHOTO PLACEHOLDER: VRF chiller plant
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VRF chiller plant

Water

In New York City the water argument is a compliance and cost argument, not a sustainability slogan.

Makeup water equals evaporation plus blowdown plus drift. Evaporation does the cooling; blowdown is what the treatment program controls through cycles of concentration.

What the gallons cost

NYC rate$5.35 per 100 cubic feet of water from July 1, 2026, with wastewater billed at 159% of water: $13.86 combined (NYC Water Board FY2027 rate schedule). The prior year was $5.05 and $13.08.
ScaleA 1,000-ton tower at two cycles of concentration evaporates on the order of 25,000 gallons a day in season and sends a similar amount to drain; a 500-ton tower runs five to six million gallons a year. Read the building's own meter before quoting any figure.
Single passOnce-through cooling uses roughly 40 times the water of a tower and is barred for potable water in New York City. No utility rebate for converting it was found.
New JerseyNo equivalent single-pass ban was found; water is billed by the local purveyor and the arithmetic is the same.

Where controls fit

Condenser-water temperature reset, tower fan staging, blowdown control on conductivity and makeup metering are controls work, and they are where the water and energy columns of the decision get measured rather than estimated. Verified data and alarms can be integrated into the building's existing BAS or a separately scoped platform, subject to point availability, network approval, cybersecurity, alarm ownership, functional testing and commissioning. Water treatment, Legionella sampling and the State or City certifications are performed by the qualified people the rules name; the review says what they will need.

Controls and building automation →

Who pays

No program funds compliance. Equipment can qualify.

Legionella testing, water treatment and certifications are operating costs in every state. Replacement equipment and controls may qualify for utility incentives, and the utility's approval comes before purchase.

New York City and Westchester

Con Edison2026 commercial program incentives pay for replacing working equipment, not failed equipment; the 2026 manual expires December 31, 2026 and no 2027 manual is published.
ControlsNew or expanded building automation is paid on the kilowatt-hours it saves.

Incentives and financing →

New Jersey

UtilitiesPSE&G, JCP&L and Atlantic City Electric each run equipment rebates and a custom track paid on kilowatt-hours saved; the current program cycle ends June 30, 2027.
ControlsControls funding by utility is on the controls page.

Controls funding by state →

Next step

Start with a tower decision review.

Send the tower's registration and last three years of test records, a recent water bill and the chiller's nameplate; add a trend export if you have one. The review returns a dated comparison of repair, replacement and removal with water, chiller energy and the compliance load shown for each, and it names the facts that still need a meter or a test. It is an engineering assessment, not a water-treatment contract and not a legal opinion.

Send the building details →

Until the screening tool is live, this is a short intake form.

Sources and dates

NYC Administrative Code §17-194.1; Local Law 159 of 2025 (effective May 7, 2026); 24 RCNY Chapter 8 as amended, Notice of Adoption (in force May 8, 2026), §8-04, §8-05(f), §8-06, §8-07 and the §8-09 penalty schedule (read from the Notice of Adoption, October 28, 2026).
NYC DOHMH press releases: Upper East Side cluster exposure ended (July 31, 2026: 92 cases, 7 deaths, 183 towers sampled, 59 positive, 83 buildings ordered to disinfect, 82 inspected, 60% with violations); Mayor's Office and DOHMH, new Legionnaires' measures (September 1, 2026: 800 inspections, 460+ with violations, $80,500 in fines, 81% citywide compliance, 94 cases and 11 deaths as of August 31). South Bronx cluster, ZIP codes 10451 and 10456 (DOHMH via press, September 13 and 14, 2026: 10 cases, 1 death, 24 towers tested, 10 PCR-positive).
NYC Plumbing Code §428.1.1; 15 RCNY §20-06. NYC Water Board, FY2027 Rate Schedule effective July 1, 2026 ($5.35 per 100 cubic feet; wastewater 159%); FY2026 Rate Schedule ($5.05).
10 NYCRR Part 4, Subpart 4-1 (effective July 6, 2016); NYS S8472 (pending). Westchester County Health Department, Yonkers cluster (September 2025: 38 county cases that year, 2 deaths, about 12 towers tested).
P.L. 2024, c.66 (N.J.S.A. 58:12A-12.10 et seq.; 26:1A-139 et seq.), §6; NJDOH Legionnaires' Disease page (updated September 23, 2026): Water Management Program Template and March 2025 letter to cooling tower operators; no proposed rule found as of October 28, 2026.
Con Edison C&I Energy Efficiency Program Manual, PY2026 v1.1 (expires December 31, 2026); NJ utility program guides (JCP&L October 2026, PSE&G 2026, ACE April 2026).
Tower and chiller figures (approach, 85°F entering condenser water, water balances) are standard design practice and order-of-magnitude; the building's own meters supersede them.
Last reviewed October 28, 2026. The New Jersey section changes on December 12, 2026 and whenever DOH or DEP rules appear; the New York City section changes when the registration-permit link and the public tower map launch; re-check the Con Edison section when a 2027 manual publishes.