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Commercial Inspectons performed to ASTM E2018 -08 Standard Guide for Property Condition Assessments



Commercial Water Towers

by Nick Gromicko and Rob London
Water towers are large, elevated water storage containers designed to hold a water supply at a height sufficient to pressurize a water distribution system.
  Rural water tower

How They Work

The height of the tower provides the hydrostatic pressure for the water supply system. The volume of the reservoir and the diameter of the piping regulate water pressure and flow rate. As the water level in the tank drops, a ballcock lets more water into the tank, in a design similar to a toilet, as described in greater detail in InterNACHI's article on that subject.


Water towers can be constructed from a variety of materials, such as steel, concrete or wood. The towers are usually spherical or cylindrical, but custom shapes are available to suit unique needs. Some water towers are quite large and serve whole communities, although, in certain areas, such as New York City, smaller water towers are constructed for individual buildings. Ornate coverings and fancy brickwork may be used to cover what may otherwise be an eyesore, or they may be simply painted. Some municipal water towers have the name of the city painted in large letters on the roof as a navigational aid to aviators.


Water towers are used for the following purposes:

  • They ensure that water will reach the upper floors of a building. New York City was one of the first cities to mandate the installation of water towers during the 1800s, which were required on every building higher than six floors;
  • They ensure that water sprays from the tap with adequate force;
  • They prevent backflow of groundwater into a system. In hilly areas, parts of a gravity-flow water supply may be subject to negative pressure, which can cause groundwater to be sucked into the system through leaks, bringing with it dirt, fertilizers and/or microorganisms.
  • They reduce the chance that water will freeze during cold weather. It is difficult for water in a water tower to freeze if it is constantly being drained and refilled.
  • They can supply water to a building during a power outage. They cannot supply water to a building indefinitely without electricity, however, because a pump is required to refill the tower.
  • Water towers contain reservoirs to help provide water during peak usage times, reducing stress on the municipal water system.
  • They are a cheaper alternative to pumps, which demand electricity and must be maintained.

Water Towers in New York CityNew York City water tower

Perhaps nowhere are water towers such an ingrained, yet anachronistic, element of a cityscape as in New York City. The robust steel and glass skyline there is dotted with small wooden water towers that are easy to mistake for vanishing relics of a bygone era. Many New Yorkers don’t realize, however, that these towers are not antiques –- most people drink, brush their teeth and bathe from the water they provide every day.

Made from wood that is neither painted nor chemically treated, New York’s water towers appear old as a necessary consequence of safeguarding potable water from contamination. They are still made from wood rather than more modern-looking metal, because metal is often prohibitively expensive. Even so, many New Yorkers have found value in the quaint, traditional feel that these towers convey, reminding a cutting-edge city of its past. In the New York community of Tribeca, water towers are required on all buildings regardless of whether or not they are functional.

The original water tower builders were barrel makers who expanded their craft to meet a modern need, as city buildings grew taller. Water towers were necessary to prevent the need for excessively high water pressure at lower heights, which could burst pipes. Today, New York water towers are all made by one of two local, family-owned companies -- Rosenwach Tank Company and the Isseks Brothers. Rosenwach has about 10,000 tanks in the city, and can build up to 300 a year — though they’ve been sluggish lately, as has much of the construction industry.

When the towers are filled for the first time they leak, but the wood quickly swells into a leak-proof membrane that will hold for 30 to 35 years. InterNACHI inspectors need only be concerned with leaking water towers, which probably need to be replaced. A crew of six men can tear down an old tank and install a new one in about 24 hours. It then takes several hours for pumps to fill them with water. Water exits from the top of the tank instead of the bottom, where natural sediments gradually accumulate. Periodic maintenance must be performed to remove natural sediments that accumulate at the base of the tank.

In summary, water towers are water storage containers that use the force of gravity to supply potable water to building and community residents. 


Commercial Property Condition Assessments and Inspections

All of our property condition inspections use the baseline property condition assessment process as outlined in the ASTM E-2018 Standards and InterNACHI International Standards of Practice for Inspecting Commercial Properties. You can specify deviations to meet your  specific needs and building type. These deviations would be mutually agreed upon and clearly stated in the inspection agreement and final report.

Inspections are generally more invasive than the PCA Property Condition Assessment Inspection outlined in the ASTM E-2018 Standards and InterNACHI International Standards of Practice for Inspecting Commercial Properties

The end result provides you with detailed picture of the age and condition of the major building components and how maintenance has effected its life span.

The final report will list deficiencies, repair recommendations, and a detailed report with representative photos when appropriate. Reports are computer generated and generally available 1-2 days after completion of the inspection. Al our reports are available online to client. This is convenient when more than one party in different locations need to view reports.

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