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

Lake and large pond management for HOAs, golf courses and campuses

A lake is an ecosystem with a budget line. We manage oxygen, nutrients, vegetation, fish populations and equipment so the water stays clear, odor-free and within the reserve study.

    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.

    Community swimming lagoon with sand beach, palms and the Santa Ana Mountains behind
    Community lagoon, Rancho Santa Margarita
    Panorama of a drained community lagoon with new white liner being covered in sand
    Lagoon relining underway, Rancho Santa Margarita

    Programs

    • Aeration system design, installation and service (diffused and surface)
    • Algae and aquatic weed control with licensed applicators, plus biological and mechanical alternatives
    • Water quality monitoring and nutrient management
    • Floating fountain installation and repair
    • Fish stocking and population management
    • Shoreline stabilization and erosion repair
    • Dredging and sediment removal coordination
    Floating fountain aerator spraying on a lake
    Floating fountain aerator

    Reporting for boards and managers

    Monthly reports with water readings, treatments applied, equipment status and photos, formatted for HOA board packets and property management files. Reserve-study input on equipment life and replacement cost is available.

    Signs you need lake help

    • Residents complain about odor, color or algae mats
    • Fish kills after hot, still weather
    • The aerator or fountain has failed and nobody owns the fix
    • Banks are eroding near walkways or tees
    • The board needs documentation for the reserve study

    What drives the cost

    Lake programs are priced annually by surface area, depth, inflow quality and the services included (aeration service, treatments, fountain care, reporting). Capital items like aeration systems and shoreline repair are quoted as projects with reserve-study input.

    What this service covers

    Lake & large pond management sits under the wider heading of aquatic management services. Clients tend to call it lake maintenance or lake service; whatever the name, the work breaks down into a few distinct jobs:

    Aeration system design and service

    Diffused and surface aeration sized to volume and depth, installed and serviced.

    Algae and aquatic weed control

    Licensed applications plus biological and mechanical alternatives.

    Water quality monitoring

    Ammonia, nitrite, nitrate, pH, KH, salt and temperature logged and trended.

    Floating fountain service

    Installation, repair, lighting and seasonal service for aerating fountains.

    Fish stocking and population management

    Stocking plans and surveys to keep the food web balanced.

    Shoreline stabilization

    Erosion repair that holds through storm season.

    Dredging coordination

    Sediment surveys and contractor coordination when a lake has filled in.

    Terms you'll hear from our technicians on this work: diffused aeration, surface aerator, dissolved oxygen, nutrient loading, phosphorus, thermal stratification, beneficial bacteria, pond dye, licensed applicator, reserve study.

    Where we offer it

    Routed service through Orange County, Los Angeles, San Diego County, the Inland Empire and the Coachella Valley, with construction and commercial crews traveling to Arizona.

    Lake & Large Pond Management across Southern California and Arizona

    Orange County home base, routed crews from Los Angeles to San Diego and the desert. One call, one crew, written findings.

    Before and after: lake calls

    Community lagoon drained to a puddle before relining, clock tower behind
    Before: community lagoon drained for relining
    Refilled turquoise community lagoon with beach club and umbrellas behind
    After: refilled and reopened, same lagoon

    Check out Koi Pros projects

    Koi ponds, waterfalls and water features we've designed, built and maintain across Southern California, in one minute. The same crew handles lakes.

    Guides on lakes

    Fountains · 4 min

    How to DIY an outdoor fountain in a lake

    Learn how to DIY an outdoor fountain for your lake or pond with easy steps, tips, and setup advice. Make your water...

    Maintenance · 10 min

    Algae Removal and Control: Keeping Your Pond Clear All Year Long

    Practical algae removal and prevention for Southern California ponds: causes, eco-friendly control methods, UV...

    Maintenance · 18 min

    How to Remove Pond Sludge and Muck: Methods by Pond Size

    Pond sludge accumulates from fish waste, leaf litter, and decaying algae. Covers vacuuming, beneficial bacteria,...

    All pond care guides

    Questions about lakes

    Do you hold pesticide applicator licenses?

    Aquatic herbicide and algaecide applications are performed by licensed applicators in compliance with California DPR and Arizona regulations.

    How do I get rid of the smell from our HOA lake?

    Odor is almost always low oxygen at the bottom. Diffused aeration fixes the cause; treatments alone only mask it.

    Need lake help?

    We assess the whole system first, then quote a fixed scope. Call or send the form.

    Call Request assessment