File Annual Drinking Water Storage Tank Inspection Results with DOHMH by Jan. 15

Drinking water tanks help deliver pressurized water to some buildings with more than six floors.

New York City has a set of laws in place requiring owners of buildings that use these tanks to store or pressurize the building’s drinking water to inspect and clean them at least once per year. The requirement to test these water tanks and report the results are intended to make sure these drinking water tanks are free of harmful bacteria that could make New Yorkers sick.

The requirements apply to any tank used to store a building’s drinking water. If the building has a dual-purpose water storage tank that includes a fire suppression system and a drinking water supply system, the tank must be inspected because some of the water is used as drinking water.

Water tanks that are not covered by the NYC Department of Health and Mental Hygiene’s (DOHMH) inspection and reporting requirement are ones that are separate from the drinking water supply system, such as a standalone fire suppression tank. Domestic hot water heating tanks are also not subject to this requirement.

Owners must ensure that the water tank inspector submits the results of those inspections to the DOHMH by Jan. 15 of the next calendar year. We’ll go over these requirements in detail.

Annual Inspection

Annual inspections must be conducted for all drinking water tanks that are used to store or pressurize a building’s drinking water [NYC Health Code Article 141, §141.07; NYC Administration Code 17, §17-194]. According to the laws, a physical inspection of each drinking water tank includes the following:

• Assessing the condition of the internal and external tank structures, pipes, access ladders, roof, access hatches, and screen;
• Assessing the presence of pitting, scaling, blistering or chalking, rusting, corrosion and leakage, sediment, biological growth, floatable debris or insects, and rodent/bird activity in or around the tank; and
• Taking a bacteriological (coliform) sample and sending it to a New York State Environmental Laboratory Approval Program (NYS ELAP)-certified lab.

The inspection results must be made available to the DOHMH by Jan. 15 of the following year and must be maintained by the building owner for at least five years.

If unsanitary conditions are found during the physical inspection, or if coliform bacteria are found in a building’s drinking water, the storage tank from which the sample was collected may be contaminated and require cleaning and disinfection. Any sample that indicates the presence of coliform bacteria, such as E. coli, must be reported to the DOHMH within 24 hours. Necessary corrective actions, such as cleaning and disinfection, must be taken immediately. The DOHMH may be contacted by email at watertanks@health.nyc.gov.

Violations may be issued for failure to complete an annual inspection. Only a qualified water tank inspector is allowed to submit a drinking water tank inspection report to the DOHMH. The NYC Administrative Code and the Health Code define a water tank inspector as the following:

• A licensed master plumber;
• A person who works under the direct and continuing supervision of such a licensed master plumber; or
• A licensed professional engineer or architect design professional.

Annual Cleaning and Disinfection

While the NYC Health Code §141.09 requires that drinking water storage tanks be cleaned if there’s a positive bacteriological result that’s attributed to the sanitary conditions of the tank, the NYC Plumbing Code Chapter 6, §606.5.4.5.3 requires all water tanks to be cleaned at least once a year. These cleanings must be completed only by a person or business with a valid permit issued by the Commissioner of Health and Mental Hygiene.

When a tank is cleaned, the water supply connections to and from the tank must be disconnected or effectively plugged. Then the tank is drained and cleaned. Before the tank can be put back in service it must be disinfected by washing the underside of the top, the bottom, and the walls with hypochlorite solution. The tank must then be filled with water and the chlorinated water must remain in the tank for two hours. After two hours, the tank must be drained completely before refilling for regular use.

Chlorine levels must be taken to validate that the disinfectant levels are below EPA National Primary Drinking Water Regulations. Additionally, a post-cleaning coliform sample should be taken to validate the effectiveness of the disinfection and cleaning process.

A record of the disinfection and cleaning should be kept by the owner for a least five years and made available to the DOHMH within five business days.

Submitting Reports

The water tank inspector must submit the report on the DOHMH’s online Drinking Water Tank Inspection Reporting system. To complete the form, the water tank inspector will need to register with a valid email address. After registration, partially completed reports can be saved and finished later. Multiple tanks at a single building must be included in the same inspection report submission.

If you own more than one building, you must ensure that a separate reporting form is submitted by the water tank inspector for each building with a unique Department of Buildings-issued BIN that uses a tank to store drinking water. For example, if a property owner owns three separate buildings, each with a unique BIN and each with a drinking water tank, the water tank inspector would need to file three separate reports.

Make Results Available to Residents

The NYC Health Code §141.07 requires an owner to post in an easily accessible location to residents in each building served by a drinking water tank a notice that inspection results are available upon request. Owners must keep inspection results and water quality test results for at least five years.

The notice must be placed in a frame with a transparent cover. The public notice must include the name, address, and phone number where inspection results can be requested. And upon receipt of a request, the owner or manager is required make a copy of the inspection results available within five business days. For a sample notification sign, you can visit www.apartmentlawinsider.com/model-tool/post-notice-drinking-water-storage-tank-inspection-results-are-available.