New York City Cooling Tower Registrations and Legionella Test Dates

Over 15,000 cooling tower systems are tracked in this registry mandated by NYC law since August 2015. The dataset contains registration details and Legionella water test dates reported by building owners to the NYC Department of Health. Data is sourced from the NYC Cooling Tower Registration Portal and published by data.cityofnewyork.us.

Use Cases

• Mapping cooling tower density by Borough and Community_Board to prioritize public health inspections.
• Analyzing temporal patterns of Legionella testing by correlating Sample_Dates with Date_Registered.
• Identifying buildings with inactive equipment by filtering Active_Equip for risk assessment.
• Joining with property data using BIN or BBL for building-level compliance analysis.
• Spatial clustering of towers using Latitude and Longitude to model airborne pathogen dispersion.

Strengths

• Contains precise geospatial coordinates (Latitude, Longitude) for spatial analysis.
• Includes multiple official property identifiers (BIN, BBL, system_id) for data linkage.
• Tracks mandatory Legionella test dates (Sample_Dates) as required by NYC law since April 2019.

Limitations

• Dataset excludes decommissioned cooling tower systems, limiting historical trend analysis.
• Row count and total data size are unknown, preventing assessment of completeness.
• Data is self-reported by building owners, which may introduce reporting inaccuracies.

Provenance

Source

NYC Department of Buildings and NYC Department of Health via data.cityofnewyork.us.

Collection Method

Registration data entered by building owners/managers through the NYC Cooling Tower Registration Portal.

Time Range

Registrations mandated from August 2015; Legionella test reporting from April 2019.

Freshness

Last updated April 2026.

Geography

New York City, with granular fields for Borough, Community_Board, and Council_District.