New York City's cooling tower law just got a plain-English explainer running nationally, and if you manage or bid work on a building with a cooling tower, the underlying rule is worth re-reading regardless of who wrote about it this week.
Local Law 77 of 2015 requires any building with a cooling tower to register it with DOB, inspect it quarterly, and test for Legionella bacteria on a set schedule — the law followed the 2015 South Bronx Legionnaires' outbreak that killed 16 people. The testing and registration duty sits with the building owner, but on any job where your scope touches mechanical, HVAC, or a roof-level cooling tower, you're working inside a system the owner is legally required to keep documented.
Here's where it hits a contractor directly. If you're bidding cooling tower cleaning, maintenance, or replacement work, the owner's inspection and testing records are part of your due diligence — a tower that's been out of compliance has a paper trail of violations DOB will cross-reference against any new work filed on that building. A contractor who touches a cooling tower system without confirming the owner's registration is current is taking on liability that isn't theirs to carry.
For anyone managing a portfolio with cooling towers, the requirement hasn't changed this week — the news here is wider attention to a testing standard than any new deadline. But NYC's law is increasingly cited as the model other jurisdictions are studying, so the compliance habits it demands locally are worth building into your standard operating procedure if you do mechanical work anywhere towers exist, not just in the five boroughs.
Check a building's cooling tower registration status directly through DOB's Cooling Tower Registry before pricing maintenance or abatement work — it's a public lookup and it takes less time than finding out mid-job that the paperwork was never filed.