Koi pond installation in Boise, Idaho

Koi pond installation in Boise is a different job than building a garden pond with a few goldfish. People who call me about koi usually say something like, "I want fish I can keep for years, not fish I replace every spring." Koi grow big, live a long time and make a lot of waste. A pond built for them has to be deeper, better filtered and harder for predators to raid.

I'm Kabe Hockema. I build koi ponds with Aquascape components and the ecosystem approach: a skimmer, a biofalls filter, rocks and gravel, beneficial bacteria and aquatic plants all working together. For koi, I size every one of those parts up.

What koi need that a garden pond doesn't

A small garden pond can get by with a shallow basin and a modest pump. Koi can't. Here's what changes:

• More water. Koi can grow well past a foot long. They need room to swim and enough water to dilute their waste.
• More filtration. Big fish eat a lot and produce a lot of waste. The pump and filters have to keep up.
• More oxygen. Koi need well-oxygenated water, especially in summer.
• Safe hiding spots. Fish need a place to get away from predators.

Depth for Idaho winters

Boise winters freeze the top of a pond, sometimes for weeks. Koi survive by resting near the bottom, where the water stays a few degrees warmer than the surface. That only works if the pond is deep enough. I plan a deeper zone for koi than I would for a typical garden pond, so the fish have a layer of water that doesn't get too cold.

Depth alone isn't enough. The ice also has to stay open in one spot so gases can escape. I plan for a de-icer or an aerator from the start, with power run to the right place. My page on pond winterization covers the full winter routine.

Keeping herons and raccoons out

Great blue herons hunt along rivers and canals all through the Treasure Valley, and they will find a koi pond. Raccoons are a problem in many neighborhoods, too. Both like to wade in from a shallow edge. So I design koi ponds with:

• Steeper sides in the fish areas, so there's no easy place to stand.
• Fish caves and overhanging rock where koi can hide.
• Plant cover like water lilies that gives the fish shade and cover from above.
• Deeper water that makes it hard for a heron to reach the fish.

Filtration sized for a fish load

The filter is where a lot of koi pond installation jobs go wrong. I size the pump, skimmer and biofalls for the number of fish you plan to keep when they're full grown, not the size they are when you buy them. Plants and gravel give the good bacteria more places to live. If you want to understand how each part works, my page on pond filtration system installation goes through it.

How a koi pond install goes

• Design. We talk about how many koi you want, where you'll watch them from, and how the pond fits the yard. I cover this in more detail on my fish pond design page.
• Dig. I dig shelves for plants and the deeper zone for fish, keeping fish areas steep enough to stop predators.
• Liner and equipment. Underlayment, then a one-piece rubber liner, then the skimmer, biofalls and plumbing.
• Rock and fill. Rocks and gravel go in, then water, dechlorinator and beneficial bacteria.
• Plants and settling time. Aquatic plants go in, and the pond runs for a while before fish are added.
• Fish. I suggest adding koi a few at a time so the filter can catch up with the extra waste.

What drives the cost of a koi pond

My published starting price for an 8' x 11' Aquascape system pond with a waterfall is $15,500. A koi pond is usually bigger and deeper than that, so most cost more. The things that move the price:

• Size and depth. Deeper digs mean more soil to haul and more liner.
• Filtration. Larger pumps and filters for a heavier fish load.
• Soil and access. Clay, rock in the foothills, or a narrow gate all affect dig time.
• Winter gear and power. A de-icer or aerator and an outlet near the pond.
• Extras like lighting, a longer stream, or seating at the water's edge.

Koi ponds across the Treasure Valley

I install koi ponds in Boise, Eagle, Meridian, Nampa, Caldwell, Star, Middleton, Kuna, Garden City and Hidden Springs, plus Sun Valley and Ketchum. Up in the Wood River Valley, winters are longer and colder, so winter planning matters even more there. For more on keeping koi, see my main koi ponds page, and for every other pond service I offer, visit the pond contractor page.

I run every project myself, from the first meeting through the day the fish go in. I take a limited number of projects each season, and you'll have my direct number the whole way.

Plan your koi pond installation in Boise

If you're ready for a koi pond installation in Boise that your fish can live in for years, let's start with a walk through your yard. Schedule a consultation or call (541) 961-7269, Monday to Friday, 8 a.m. to 6 p.m.