NYC DEP: Water Bills, Backflow Prevention, Sewer Charges, and Dispute Process
8 min read · Updated 2025-01-15
Understand NYC DEP water and sewer billing, backflow prevention requirements, meter reading disputes, and how to appeal charges to the NYC Water Board.
NYC Water and Sewer Billing
How does NYC DEP water billing work?
NYC water and sewer charges are billed quarterly by the NYC Department of Environmental Protection (DEP). Charges are based on metered water consumption for buildings with water meters, or assessed by frontage for unmetered properties. Sewer charges are calculated as a percentage of water consumption (currently 159% of the water charge for most customers). Bills are sent to the property owner of record. Unpaid water bills become a lien on the property, similar to property taxes.
Why is my water bill unexpectedly high?
Sudden spikes in water consumption usually indicate a leak — most commonly a running toilet flapper, a dripping faucet, or a broken irrigation system. In multifamily buildings, identifying which unit has the leak can be challenging. DEP's meter data can help pinpoint when consumption spiked. You can request a meter read to confirm the bill isn't a misread. If a leak is confirmed and repaired, you may be eligible to apply for a water bill adjustment credit for a portion of the excess charges.
What is backflow prevention and is it required?
Backflow prevention devices protect the public water supply from contamination that can occur when water flows backward from a building's plumbing into the city's water main. NYC DEP requires backflow prevention assemblies on connections where there is a risk of contamination — fire sprinkler systems, boiler connections, irrigation systems, and certain industrial or commercial connections. The devices must be tested annually by a licensed tester and results reported to DEP. Failure to install or test required backflow preventers results in DEP violations.
How do I dispute an NYC water bill?
To dispute a water bill, first contact DEP's customer service to request a review of your account and a meter inspection. If you believe the meter is malfunctioning, request a meter accuracy test. If you had a documented leak that was repaired, file an adjustment application documenting the leak and repair. If you disagree with DEP's resolution, you can appeal to the NYC Water Board. The Board can hear disputes about billing methodology, meter accuracy, and eligibility for adjustments.
What is a DEP violation for illegal connection or unauthorized use?
DEP violations can be issued for illegal connections to the city water or sewer system (making a connection without a permit), unauthorized tampering with meters, discharging prohibited substances into the sewer, and failing to maintain required backflow prevention. These violations can result in service shutoffs and significant civil penalties. Any new connection or modification to your water or sewer service requires a DEP permit.
How do water charges become a lien on my property?
Unpaid water and sewer charges convert to a lien on the property after a specified period. Once liened, they accumulate interest at a high rate (currently over 18% per year) and can be sold to private lien holders. When a lien is sold, the new holder can begin foreclosure proceedings after a waiting period. Water lien foreclosures are a significant source of involuntary property sales in NYC. Pay water bills promptly, even if you plan to dispute the amount — payment under protest is allowed.
What is the "metered rate" vs. "frontage rate" for water?
Buildings with operational water meters are billed the metered rate based on actual consumption in hundred cubic feet (Ccf). Buildings without meters are billed at the frontage rate — a flat charge based on the width of the building lot in feet and the building's zoning use. Meter rates are generally more accurate and often lower for buildings with efficient water use. NYC has a metering program to install meters in all buildings that don't yet have them.
What is an EPA-mandated combined sewer overflow (CSO) and why does it affect my bill?
NYC's aging sewer system combines stormwater and sewage in the same pipes (combined sewers). During heavy rain, the volume overwhelms treatment plants, causing combined sewer overflows that release untreated sewage into waterways. DEP has major capital programs to address CSOs, and these infrastructure costs are partially reflected in the water and sewer rates charged to all property owners. While not something you directly control, understanding CSOs helps explain why NYC water rates have increased substantially over the past decade.