NYC Water Tank Inspections: Annual Drinking Water Tank Rules & Jan 15 Filing
3 min read · Updated 2026-08-13
NYC rooftop drinking water tanks need an annual inspection with results filed to DOHMH by January 15. Learn who inspects, what is tested, and recordkeeping.
The Annual Water Tank Inspection Requirement
Do rooftop water tanks in NYC need to be inspected every year?
Yes. Buildings with rooftop drinking water tanks must have each tank inspected once a year. The requirement comes from NYC Health Code § 141.07 and Administrative Code § 17-194, and it is administered by the NYC Department of Health and Mental Hygiene (DOHMH). Wooden and steel rooftop tanks store water that reaches residents' taps, so sediment, debris, insects, or bacterial contamination inside a tank is a direct public-health concern. The annual inspection confirms the tank's interior is sanitary and the water is safe. Owners of covered buildings are responsible for arranging the inspection, filing the results, and keeping the supporting records.
Who is qualified to inspect a NYC drinking water tank?
The inspection must be performed by a licensed master plumber, or by a person working under the direct supervision of a licensed master plumber, or by a licensed professional engineer (PE) or registered architect (RA). The inspector physically examines the interior of the tank, so the tank is drained and entered or examined as required. Because the work involves both plumbing knowledge and public-health sampling, using a properly licensed inspector is essential — a report from an unqualified person will not satisfy the NYC Department of Health and Mental Hygiene (DOHMH). Owners should confirm the inspector's license before the annual inspection and keep a copy of the credentials with the report.
What does a NYC water tank inspection check for?
The annual inspection evaluates the tank's sanitary condition. The inspector looks at the interior surfaces, checks for sediment buildup on the bottom, and inspects for debris, insects, animals, or other contamination. The inspection also includes water-quality sampling — coliform bacteria testing — to confirm the stored water is microbiologically safe. If the tank is dirty or the sample fails, the tank must be cleaned and, where needed, disinfected and retested before it is considered compliant. The findings, including the coliform results, are documented and reported to the NYC Department of Health and Mental Hygiene (DOHMH). Regular cleaning between inspections helps a tank pass and keeps residents' water safe.
Filing, Deadlines, and Recordkeeping
When is the NYC water tank inspection report due?
Inspection results must be filed with the NYC Department of Health and Mental Hygiene (DOHMH) by January 15 of the year following the inspection. In other words, an inspection performed during a given year must be reported through the DOHMH online portal by January 15 of the next year. Owners should schedule the physical inspection well before year-end so there is time to clean and retest the tank if it fails, and still file by the January 15 deadline. Filing is done electronically through the DOHMH reporting portal, and the confirmation of filing should be saved with the building's compliance records.
How do I file NYC water tank inspection results?
Results are submitted electronically through the NYC Department of Health and Mental Hygiene (DOHMH) online drinking water tank inspection reporting portal. The filing captures the inspection date, the inspector's information, the tank's condition, and the water-quality sampling results. Because the deadline is January 15 for the prior year's inspection, owners should not wait until the last minute — technical issues, a failed sample requiring a re-test, or a missing inspector credential can all delay a filing. After submitting, keep the electronic confirmation. The official DOHMH page linked below explains the current portal steps and account requirements for filing.
How long must I keep water tank inspection records in NYC?
Owners must retain the inspection reports and water-quality records for at least five years. In addition, the owner must post a notice, visible to residents, stating that the water-quality inspection results are available on request. That transparency requirement lets tenants confirm the water they drink has been tested. Keeping five years of organized records — inspection reports, coliform results, cleaning documentation, and filing confirmations — also protects the owner during a NYC Department of Health and Mental Hygiene (DOHMH) audit and during a sale or refinance, when buyers and lenders may ask for proof of compliance. Store both paper and digital copies where they can be produced quickly.