Water filters for co-ops and condos

Approval is the schedule, not the plumbing

In a co-op or a condo the installation itself is rarely the hard part. A point-of-use filter in a kitchen cabinet is a straightforward job. What governs the timeline is the building's alteration process, and that runs on a calendar nobody on site controls.

Most buildings have a written procedure: an alteration agreement, a description of the work, evidence of contractor insurance naming the building as additional insured, and sometimes a refundable deposit. Some boards meet monthly, so a submission that misses a meeting waits another month.

Start this before you book anything. We can supply the insurance certificates and a written scope for the submission, and we would rather do that at the enquiry stage than have a booked slot expire while paperwork circulates.

What you can and cannot touch

You control the plumbing inside your own unit, generally from the point where the branch leaves the shared riser. You do not control the riser, the building main, or anything serving another apartment, and that rules out whole-building treatment as something you can install for yourself.

In practice this narrows the sensible options to point-of-use equipment, which is usually the right answer in these buildings anyway. If the concern is lead from old pipework, a certified filter at the kitchen tap addresses it more directly than anything at the building main would.

Work hours and lift access are also commonly restricted. A building that allows contractor work only between ten and four on weekdays changes how a job is scheduled, and it is worth telling us that up front.

If the water problem is the building's, not yours

Sometimes what you are noticing is not solvable inside your apartment. Discoloured water throughout the building after work on the mains, low pressure on upper floors, or a persistent smell affecting multiple units are building-level issues, and filtering one kitchen tap treats a symptom while the cause continues.

Raise those with the managing agent, and raise them in writing. Buildings with a shared storage tank, which is common in taller properties, have their own maintenance and cleaning obligations, and a tank that has not been serviced is a building matter rather than a resident one.

We will tell you when that is what we are looking at rather than selling you equipment that cannot fix it.

The constraints that decide what is possible

These are checked before any equipment is discussed, because in this kind of property they rule options in and out before water quality does.

• Board approval, often with a formal alteration agreement
• Proof of contractor insurance naming the building as additional insured
• Restrictions on work hours and lift access
• No access to the building main, so whole-building treatment is not yours to install

Permission and approval

Start the approval process before booking any work. Several weeks is normal and some boards meet only monthly.

Equipment that suits this setting

• Under-sink carbon filters. A carbon block cartridge on the cold line under the sink. No permanent alteration required in the right configuration.
• Reverse osmosis, tankless. A pumped membrane system that produces water on demand rather than storing it, so it takes far less cabinet space and can sit on a counter. No permanent alteration required in the right configuration.
• Lead reduction filters. Point-of-use filters certified for lead under NSF/ANSI 53. No permanent alteration required in the right configuration.

What this equipment will not do

• Hardness and scale.
• Nitrates, fluoride, and most dissolved salts.
• Bacteria and viruses.

Problems that come up in these properties

• 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.

How the work is done

• Free water testing. Typically 45 to 60 minutes.
• Under-sink reverse osmosis installation. Typically 2 to 4 hours.
• Maintenance and filter replacement. Typically 30 to 90 minutes per visit.
• System relocation. Typically half a day at each end.

Other property types

• Brownstones and pre-war buildings
• Rentals
• Single-family homes on city water
• Homes on private wells
• New construction
• Restaurants and cafes

Where we work

We cover New Jersey, Pennsylvania, Connecticut, and New York. Water quality is local, so our service area pages carry the utility, source water, treatment method, and reported contaminants for each town, with the source and the year attached.