New York does not require apartment buildings to install or maintain water filters

New York State and New York City do not have a law that forces apartment building owners to put filters on the water supply. The city's water system is treated at municipal plants and tested regularly, so landlords are not legally required to add filtration at the building level or in individual units.

That said, a landlord can install filters voluntarily, and some do — either as a building-wide system or by allowing tenants to use their own. The choice belongs to the owner, not the tenant. If you want filtered water in your apartment, you can install a pitcher filter, faucet filter, or under-sink system yourself at your own cost, or you can ask your landlord whether they would consider adding one.

Key Takeaways

  • New York City water is treated and tested by the Department of Environmental Protection, so filtration is not legally required in apartment buildings.
  • Landlords can choose to install filters but are not obligated to do so under state or city housing law.
  • Tenants can install their own portable or faucet-mounted filters without landlord permission in most cases, as long as they do not damage the pipes.
  • If your tap water has a visible problem — discoloration, odor, or taste — contact your landlord and the city's 311 line to report it.
  • Lead in water is a separate issue from general filtration and is regulated under federal law; landlords must disclose known lead and test if required.

When a landlord might install building-wide filtration

Some apartment buildings do have filtration systems, usually installed at the main water line where water enters the building. These are not required by law, but a landlord might add one if the building has old pipes, if tenants have complained about water quality, or if the owner wants to market the building as having filtered water.

If your building has a system like this, the landlord is responsible for maintaining and replacing filters on schedule. If filters are not changed regularly, they can become ineffective or even harbor bacteria. You can ask your landlord or building manager whether your building has filtration and, if so, when filters were last replaced.

What you can do if you want filtered water in your unit

You have several options that do not require landlord permission. A pitcher filter (like Brita or PUR) sits on your counter and filters water as you pour. A faucet-mounted filter screws onto your kitchen tap. Both are inexpensive, removable, and do not alter the building's plumbing.

An under-sink filter system is more permanent but still removable. It connects to the water line under your sink and requires basic plumbing knowledge or a plumber to install. Before installing anything under the sink, check your lease to see whether it restricts modifications. Most leases allow you to install filters as long as you remove them before you move out and do not damage the pipes.

If you rent and want to install a system that requires drilling or permanent changes, ask your landlord in writing first. Most will say yes to a filter, but getting permission protects you from disputes when you leave.

Lead in water: a separate legal issue

Lead contamination is regulated separately from general water quality. Federal law requires landlords to disclose known lead hazards in buildings built before 1978. If your building was constructed before that year, the landlord must give you a disclosure form before you sign a lease.

New York City also requires landlords to test for lead in water in buildings with six or more units if the building was built before 1987. If lead is found above the federal action level, the landlord must notify tenants and take steps to reduce it — which may include installing filters, flushing lines, or replacing pipes. If you suspect lead in your water, contact your landlord and call 311 to report it.

How to report water quality problems to the city

If your tap water looks discolored, smells bad, or tastes unusual, tell your landlord first. They may need to flush the line or check for a building-level issue. If the problem persists or your landlord does not respond, call 311 or go online to report it to the New York City Department of Environmental Protection.

The city can send someone to test your water and investigate whether the problem is in the building's pipes or in the municipal supply. If the issue is in the building, the landlord is responsible for fixing it. If it is in the city's system, the DEP will address it. Either way, reporting it creates a record and can prompt action.

What New York City water testing shows

The New York City Department of Environmental Protection tests the city's water supply constantly and publishes an annual water quality report. The water meets or exceeds all federal and state standards for safety. The report is available online and shows what contaminants are tested for, what was found, and whether levels are within legal limits.

This testing is why filtration is not required by law — the water leaving the treatment plant is safe to drink. However, problems can occur in older building pipes, which is why some buildings install filters or why tenants choose to use them for taste or peace of mind.

Frequently Asked Questions

Can my landlord charge me for a building-wide water filter?

No. If a landlord installs a filter as part of the building's infrastructure, the cost is the landlord's responsibility and cannot be passed to tenants as a separate charge. It may be factored into rent increases, but only within the limits set by New York's rent stabilization laws if your unit is rent-stabilized.

Will a pitcher filter remove lead?

Some pitcher filters reduce lead, but not all. Check the product label or manufacturer's website to see what contaminants it removes. If lead is a concern in your building, ask your landlord to test the water first so you know what you are filtering for.

What if my landlord says I cannot install a filter?

A pitcher or faucet filter is usually considered a tenant's personal item and does not require permission. An under-sink system that connects to plumbing may require landlord approval depending on your lease. If your landlord refuses and you believe it is unreasonable, you can contact the New York State Division of Housing and Community Renewal for guidance.

Does the city test water in individual apartments?

The city tests the water at the treatment plant and at hydrants throughout the system. They do not routinely test inside individual apartments unless a specific complaint is made. If you report a problem to 311, the city may send someone to test your unit's water.