Building the best and fixing the rest · Mon–Fri 8–4 · Sat 9–5 · Orange, CA · Serving Southern California & Arizona [email protected]
Koi Pros

Corona pond builders, water feature care and leak repair

South Corona and Sierra del Oro estates with large ponds; Dos Lagos commercial water features.

    Request an assessment

    Tell us about the feature and where it is. We reply within one business day.








    Or call (714) 613-0123. No marketing emails; we only follow up about your request.

    Koi pond fed by a boulder stream and waterfall
    Stream-fed koi pond
    Boulder waterfall and stream through a shaded garden
    Boulder waterfall and stream
    Natural waterfall between boulders into a clear pool
    Boulder waterfall and pool

    Pond and water feature conditions in Corona

    Every pond, fountain and lake is a small ecosystem that answers to local conditions. These are the ones that shape how we build and service water features in Corona.

    Tap water and fill water

    Corona blends local groundwater, imported water and output from its desalter; hard, chloraminated, with hardness highest in south Corona.

    Heat, evaporation and wind

    Hot inland valley (upper 90s) with strong Santa Ana winds funneling through the Santa Ana Canyon; cool winters.

    Soil, grade and excavation

    Clay and decomposed granite on the Cleveland National Forest foothills; graded fill in the newer south Corona communities.

    Predators and wildlife

    Coyotes, bobcats and raccoons from the Cleveland National Forest; herons from the Dos Lagos lakes and the Santa Ana River.

    Great blue heron with a fish in its beak
    Herons are the number-one koi predator in Southern California

    Leaf and debris load

    Eucalyptus, pine and pepper; wind-driven debris during Santa Anas is the main service issue.

    Showa and kohaku koi through an acrylic viewing window
    Showa and kohaku through the viewing window

    Water features we build and service in Corona

    South Corona and Sierra del Oro estates with large ponds and waterfalls, the Dos Lagos commercial lakes and HOA features, Eagle Glen golf community lakes, and older Corona Heights homes.

    Neighborhoods and communities we work in: South Corona, Sierra del Oro, Dos Lagos, Eagle Glen, Corona Heights, Chase Ranch.

    Residential pond, waterfall and fountain services

    Design and construction

    Scheduled care

    Repair and water loss

    Commercial water feature services in Corona

    Property types

    Lake and large-feature programs

    How Corona service is scheduled

    Corona is on our Inland Empire route: weekly routed maintenance, repair visits scheduled around the route, and construction crews dispatched from Orange County for the duration of a build.

    Local water features worth knowing

    If you want to see what balanced water looks like at scale before planning your own feature, Corona has good public examples nearby: Dos Lagos lakes; Eagle Glen Golf Club lakes; Santa Ana River Trail. The same principles — depth, circulation, filtration sized to the biological load, and shade — apply to a backyard koi pond.

    Nearby cities

    Pond and water feature service in Corona

    Koi ponds, waterfalls, fountains and lakes, built and cared for by crews on a weekly routed service from Orange.

    Work in Corona

    See more pond, waterfall and fountain projects

    Pond care guides for Corona owners

    Maintenance · 19 min

    Pond Water Quality Parameters: Testing and Management Guide

    Pond water quality parameters include pH, ammonia, nitrite, nitrate, KH, GH, dissolved oxygen, and temperature....

    Construction · 9 min

    Koi Pond Installation: What Every Homeowner Should Know

    How to plan, design, and maintain a koi pond. Koi pond installation steps, costs, and why hiring a professional...

    Maintenance · 37 min

    How Biological Filtration Works in a Koi Pond

    Biological filtration converts fish ammonia to nitrate via nitrifying bacteria on pond media. Covers cycling, media...

    All pond care guides

    Check out Koi Pros projects

    Koi ponds and water features we've designed, built and maintain across Southern California, from the crews that serve Corona.

    Pond service questions from Corona

    Is Corona tap water safe for koi?

    Yes, with a chloramine-safe conditioner. The water is hard, hardest in south Corona, so we schedule descaling for pumps and nozzles.

    Why does my Corona pond turn green every summer?

    Upper-90s heat warms the water fast, and Santa Ana winds load ponds with eucalyptus and pepper debris. Shade, depth and good filtration keep algae down.

    What's eating the fish in my pond?

    Coyotes, bobcats and raccoons come in off the national forest foothills, and herons fish from Dos Lagos and the river. Overhangs and hiding places give koi a fighting chance.

    How much does koi pond maintenance cost here?

    We quote after one visit. Santa Ana wind events are the main extra cost here, since a big one can call for a cleanup visit.

    Do you build new koi ponds locally?

    Yes, and we prepare the base to suit the lot: clay and decomposed granite in the foothills, graded fill in south Corona's newer communities.

    Pond or fountain in Corona?

    Schedule an on-site assessment. We'll test the water, check the equipment and tell you what it needs.

    Call Request assessment