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Water filter service in Bronx, NY

Testing, installation, and service for homes and businesses in Bronx, Bronx County. What follows is what we can source about the water here.

Bronx County Population 1,384,724
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What is in the water in Bronx

Bronx is served by New York City Department of Environmental Protection .

Source water: The Bronx is where the Croton system comes back into the city, and that makes it the exception to everything said about New York water elsewhere. Jerome Park Reservoir, built between 1894 and 1905, holds 770 million gallons across two basins covering 94 acres, takes water from the Croton watershed in Westchester and Putnam counties, and is the last stop before that water reaches treatment. An 850 foot tunnel connects it to the New Croton Aqueduct and two 4,000 foot tunnels run between the reservoir and the plant. The Croton system has been in use since 1842 and is the oldest part of the city's supply. Reported by New York City Department of Environmental Protection for 2022.

The Croton Water Filtration Plant sits entirely beneath the Mosholu Golf Course in the Bronx. It was completed in 2015, cost 3.2 billion dollars, has a capacity of 290 million gallons a day and can treat between 20 and 30 per cent of the city's daily use. It is the only filtration plant the city's surface supply has; the Catskill and Delaware system that feeds the rest of New York remains the largest unfiltered supply in the United States. So part of the Bronx drinks the one New York City water that has actually been through a filter, and the borough sits on the boundary where Croton and Catskill Delaware water meet. Croton water is the harder of the two, and a boundary between two waters of different hardness moves as the city balances its system.

Reported hardness is 1.8 grains per gallon , which is moderate. Source: New York City Department of Environmental Protection, 2025. Citywide average. Water softeners are very rarely warranted anywhere in the city on this supply.

These figures describe the distribution system. Your own tap can differ, and for lead it very likely does.

We do not yet hold a sourced figure for every field on this page. Where something is missing it is left blank rather than estimated, because an unsourced number here would look like information.

Buildings and plumbing in Bronx

The blend boundary is the piece that matters here and it is specific to this borough. Corrosion control works by maintaining a film on the inside of a pipe, and that film forms under a particular water chemistry. Croton water and Catskill Delaware water differ in hardness and in alkalinity, and where the boundary between them shifts, a pipe experiences a change rather than a constant. The city doses phosphoric acid as an inhibitor across the system to manage exactly this. In New York the property owner owns the service line in its entirety, not merely the private half, so replacement is the owner's cost unless a programme covers it. Look up the recorded material for your address, and if it reads unknown, sample the first draw of the morning rather than assuming.

PFAS in Bronx

New York State sets limits of 10 parts per trillion each for PFOA and PFOS. Separately, the city protects its supply at source rather than filtering it: more than 2.7 billion dollars has been invested in watershed protection since the early 1990s, at roughly 100 million dollars a year. That upstream approach is why the Catskill and Delaware supply is one of the largest unfiltered surface water systems in the world, and why its PFAS history has been one of non-detection rather than treatment.

Source: New York City Department of Environmental Protection, 2025. More on confirming and treating this on our PFAS page.

What this means in practice

  • Hard water. Confirm with hardness test strip or titration kit, in grains per gallon.
  • Chlorine and chloramine taste. Confirm with free and total chlorine test strip, plus the utility report for the disinfectant type.
  • Lead in drinking water. Confirm with certified laboratory analysis of a first-draw tap sample.
  • PFAS. Confirm with certified laboratory analysis using an epa-approved pfas method.

What these figures mean for filter choice

At around 1.8 grains per gallon this is soft water. A softener here would be solving a problem you do not have, and we would tell you so rather than quote for one. Scale is not what is shortening your water heater's life in Bronx.

Lead is a plumbing question rather than a supply question in Bronx, as it is everywhere. What that means practically is that a filter certified under NSF/ANSI 53 for lead at the tap you drink from sits downstream of the entire problem, whereas a whole-house filter at the point of entry sits upstream of nearly all of it and costs several times more.

Filters that apply here

  • Lead reduction filters. Point-of-use filters certified for lead under NSF/ANSI 53.
  • PFAS reduction systems. Reverse osmosis or a certified activated carbon system aimed at per- and polyfluoroalkyl substances.
  • Under-sink carbon filters. A carbon block cartridge on the cold line under the sink.
  • Reverse osmosis, tank. A membrane system under the sink that produces treated water to a dedicated tap and stores it in a small pressure tank.
  • Whole-house filtration. A filter plumbed into the main line where water enters the building, so every tap, shower, and appliance downstream is fed treated water.

Installation in Bronx

Renters, co-ops, and businesses

Local programmes

  • Lead Service Line Replacement Program, active in the Bronx. Free replacement of private lead service lines in targeted Bronx neighbourhoods. Owners are contacted directly by DEP. Replacement is also free citywide whenever a lead line is found during water main work.
  • Free lead test kit. DEP supplies a free kit with a pre-paid shipping label, with results in about 30 days. Request one through 311.

Nearby areas

Sources

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