New York City
Koi Pond NYC
| Okeanos Group
Custom koi ponds designed for New York \u2014 rooftops, townhouse gardens, and indoor installations built to survive the winter and last decades. Okeanos Group has been designing and installing koi ponds across NYC since 2002, with projects featured in Architectural Digest, Elle Decor, and Dwell.
Every koi pond NYC project we take on begins with a structural and mechanical survey before a single line is drawn. We build ponds that hold up under urban conditions \u2014 Manhattan rooftop loads, Brooklyn brownstone excavation limits, Long Island estate scale \u2014 and we service them year-round.
Why NYC Koi Ponds Are Different
A koi pond New York project carries structural, climatic, and regulatory constraints that a suburban pond never has to contend with. Winter is the first factor. Koi can overwinter outdoors in New York, but only if the pond is deep enough and engineered for freeze protection. We build to a minimum depth of 36 inches for Manhattan and Brooklyn installations, with heated systems on almost every rooftop koi pond NYC project.
Structural load is the second constraint. A filled koi pond weighs roughly 62 pounds per cubic foot of water, plus rockwork, plus equipment, plus any soil or planting. A 3,000-gallon rooftop koi pond NYC installation can exceed 30,000 pounds once loaded. On any rooftop or terrace, we work with a licensed structural engineer to calculate dead and live loads, confirm point loading, and specify a waterproofing membrane that will not fail under thermal cycling.
Brooklyn koi pond projects face a different constraint: excavation depth. Brownstone backyards in Park Slope, Brooklyn Heights, and Carroll Gardens often sit above bedrock, old foundation footings, or party walls that limit how deep we can dig. We work around it with partially raised pond walls and offset filter rooms in the basement.
Noise ordinances affect pump selection and waterfall design. Predator pressure drives depth profile, netting, and cave geometry. Changing building drainage may require permitting. It is what separates a koi pond NYC installation that lasts 20 years from one that fails in the second winter.
Project Types We Build
Rooftop koi ponds
The most common koi pond New York project we see today. Every rooftop koi pond NYC installation begins with a structural survey and a waterproofing specification. Typical volumes run 2,000 to 4,000 gallons. All rooftop ponds are heated and insulated for winter, with equipment rooms on the roof or one floor below. Many integrate with skyline views — Hudson Yards, Central Park South, Tribeca terraces.
Townhouse garden ponds
Brooklyn brownstones, Upper East Side, Upper West Side, and Park Slope rear gardens. Typically 3,000 to 8,000 gallons, with adjacent basement filter rooms to keep mechanical noise and visual clutter out of the garden. Usually incorporate a raised stone edge, a modest waterfall, and a bottom-drain main filtration loop. Winter heating is standard.
Indoor koi ponds
Conservatory installations, indoor water gardens, basement atrium ponds, and double-height entry features. An indoor koi pond NYC project trades freeze risk for humidity management, ventilation, and filtration demands that are often higher than an outdoor pond of the same volume. We design the mechanical loop to handle year-round full bio-load.
Estate ponds
Long Island koi pond projects on the North Shore — Old Westbury, Muttontown, Mill Neck — along with Westchester, Greenwich, and Hamptons properties. Volumes run 10,000 to 50,000 gallons and higher, with landscape-integrated streams, multiple waterfalls, plant shelves, and viewing bridges.
Commercial koi ponds
Restaurant courtyards, hotel lobbies, office building entries, and medical and dental offices. Engineered for daily public view, heavier filtration, and automated water changes. Built to a maintenance standard that assumes the pond will be seen by hundreds of people a day.
Zen and minimalist ponds
Small-footprint architectural water features holding two to five showpiece koi rather than a full collection. Typically under 1,500 gallons, often stone-lined, designed in collaboration with the architect so the pond reads as a built-in element rather than a landscape feature.
Featured Koi Pond Projects
Selected work from the portfolio:
Koi Pond
Primary showcase project, landscape-integrated design with custom filtration.
The Stable Home, Hamptons
Estate-scale installation, integrated with the property’s hardscape and planting.
Skylight Water Feature
Indoor water-feature-with-koi hybrid under a skylight — one of our more unusual builds.
Private Residence
Residential integration with contemporary architecture.
Featured in Architectural Digest, Elle Decor, and Dwell.
Engineering Considerations
Seven systems decide whether a koi pond NYC installation succeeds or fails. Every one is specified before construction starts.
Filtration
Three stages: mechanical, biological, and UV. Rotating drum filters or sieve units for ponds over 4,000 gallons. Biological sized to peak feeding load. UV sterilization controls algae and protects koi from waterborne pathogens. Filter rooms sized for service access, not minimum footprint.
Aeration
Koi need dissolved oxygen year-round. Surface disturbance from a waterfall handles warm-weather aeration. In winter, when waterfalls are shut down to prevent ice damage, we switch to deep aeration via airstones on a dedicated blower. Oxygen crashes kill more koi than almost any other cause.
Heating
Essential for any outdoor Manhattan or Brooklyn koi pond. Gas or electric in-line heaters sized to hold 50–55°F through the coldest weeks. Running a koi pond NYC installation at winter setpoint is not optional if the pond is under 5,000 gallons — heat loss on a small urban pond is too aggressive to ignore.
Bottom drains & skimmers
Any koi pond over 2,000 gallons gets a bottom drain — usually two — plumbed to the mechanical filter. Skimmers handle surface debris. The split between bottom and surface flow is tuned to the pond shape and the planting plan.
Structural & waterproofing
Three systems chosen by context: EPDM rubber liner for excavated garden ponds. Polyurea spray-applied membrane for rooftop koi pond NYC work — seamless, UV-stable, traffic-tolerant. Poured concrete with interior liner or tile for estate and commercial work where the pond is part of the architecture.
Predator protection
Netting systems, recessed rock-overhang caves, and depth profile — a 36-inch minimum depth gives koi room to escape a heron’s strike zone. Raccoons are the bigger problem in Brooklyn and Queens gardens. We design edges they cannot use as staging.
Monitoring & control
Neptune Apex or Orion-class controllers manage temperature, pH, ORP, and flow. Water-parameter alerts route to the client’s phone. On estate projects and high-value indoor ponds, we add redundant probes and an automatic top-off tied to the domestic water supply with a backflow preventer.
Koi Health and Stock
We source koi through established relationships with select Japanese breeders and a short list of domestic farms. We do not stock a new koi pond until the nitrogen cycle is fully established \u2014 typically 30 to 60 days after the pond is filled and the filters are running. Stocking an uncycled pond is the single most common way new koi owners lose fish in the first year.
Every koi that comes into an Okeanos client pond passes through a 30-day quarantine at our facility. Quarantine includes KHV and SVC screening, a structured deworming protocol, and twice-weekly water testing. Fish that fail quarantine do not go to a client pond.
Once stocked, koi pond maintenance NYC protocols govern health: weekly water testing during the active season, quarterly lab panels, and annual physical inspection of the collection. Feeding is seasonal \u2014 high-protein summer diet tapering to wheat-germ-based winter food below 55\u00b0F, and no feeding below roughly 48\u00b0F.
Maintenance Program
A koi pond is a living system. It needs service year-round, not just in summer.
Peak season (Apr–Oct)
Weekly or bi-weekly visits. Filter cleaning, water chemistry testing, skimmer emptying, pump inspection, koi health check, debris removal.
Off-season (Nov–Mar)
Bi-weekly or monthly visits. Heater verification, de-icer check, winter aeration confirmation, light feeding only on warm days, ice monitoring.
Spring startup
Full system restart, biological filter reactivation, first full water change, koi health inspection coming out of winter.
Mid-season pruning
Aquatic plant management, edge weed control, rockwork re-set if needed.
Fall shutdown
Pre-winter deep clean, leaf net install, feed-down, heater setpoint confirmation.
Annual deep clean
Full filter overhaul, UV bulb replacement, pump rebuild or replacement on schedule, liner inspection.
Quarterly lab testing
Water parameters sent to an outside lab for heavy metals, phosphate, and trace minerals.
Koi pond maintenance NYC pricing is sized to pond volume and visit frequency. All maintenance relationships are contract-based, annual. See /aquarium-maintenance for the full service program.
Borough & Area Coverage
Manhattan
Rooftop koi pond NYC projects across Tribeca, Central Park South, Hudson Yards, and the Financial District. Brownstone garden ponds on the Upper East Side and Upper West Side.
Brooklyn
Townhouse koi pond Brooklyn installations in Park Slope, Brooklyn Heights, Carroll Gardens, Cobble Hill, and Williamsburg. Most Brooklyn koi pond work is excavated garden, with filter equipment in the basement.
Queens
Long Island City, Astoria, and Forest Hills. Mixed rooftop and garden work.
Westchester
Scarsdale, Rye, Bedford, Bronxville, and Pound Ridge. Estate and mid-size residential.
Greenwich, CT
Residential estate koi ponds, typically landscape-integrated with streams and waterfalls.
Long Island
North Shore \u2014 Old Westbury, Muttontown, Mill Neck, Lloyd Harbor. Estate work with 20,000-plus gallon installations and full stream systems. Hamptons \u2014 see The Stable Home, Hamptons.
Northern New Jersey
Tenafly, Alpine, Saddle River, Englewood Cliffs, and Upper Saddle River.
Outside this coverage area, we take on projects selectively \u2014 generally when a client has worked with us before or when the project scope justifies travel.
Investment
What drives the range: volume, structural work, waterproofing system, filtration specification, heating system, rockwork and stonework, planting, lighting, automation and monitoring, and maintenance contract terms. Every project is site-surveyed before quoting. We do not provide fixed package pricing.
Next Step
We run free initial consultations \u2014 on-site or virtual, 30 to 45 minutes. We walk through your site or your plans, ask what you want the pond to do, and give you a feasibility read on the spot: structural, mechanical, aesthetic. If the project fits, we quote a site survey. If it does not, we say so.
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521 West 26th Street #600, New York, NY 10001