Landscaping & Irrigation · Property Services

Rain Garden & Bioswale Installation

Rain gardens are shallow planted basins that soak up runoff from roofs and driveways, reducing flooding and filtering pollutants. They support wildlife and look like a garden. NorTech connects you with a verified licensed landscape contractor who designs the garden for your site and bids the work in writing.

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How a rain garden works

Water from a downspout or paved area flows into a low spot with amended, free-draining soil and deep-rooted plants. The water pools briefly and soaks in over a day or two, rather than running off to the street. Plants take up some of the water and pollutants, and their roots keep the soil open so it continues to drain. The garden should be placed away from foundations and sized for the roof or pavement area feeding it, and it needs a safe overflow path for large storms.

Soil tests, size and placement

A percolation test shows how fast the soil drains. Heavy clay may need amendment or an underdrain pipe. The contractor sizes the basin based on the drainage area and rainfall, and builds an overflow so excess water leaves without eroding soil. Setbacks from buildings, septic systems and utilities are important. Local programs sometimes provide design help and rebates, so ask before you start digging. Ask the contractor to mark the downspout connections and the overflow route on a simple sketch, so you know where water goes in a big storm.

Plants, mulch and upkeep

Choose plants that tolerate both wet and dry conditions, such as native grasses, sedges and perennials with deep roots. Mulch reduces weeds and holds moisture. Water new plants until they are established, remove sediment at inlets and keep the overflow clear. Inspect the garden after storms and top up mulch each year. A healthy rain garden improves with age and supports birds, bees and butterflies. Keep a few photos of the garden during and after a storm, which shows how well it works and helps with rebate checks or future adjustments.

When to book rain garden & bioswale installation

Downspouts cause erosion or puddling.

You want to reduce stormwater runoff.

You want a garden that handles heavy rain.

A local program offers rebates.

You want to support wildlife.

You are redesigning a drainage problem area.

60-Day Warranty

Backed by your provider’s warranty. If covered work fails, your provider makes it right — free.

Frequently asked

Rain Garden & Bioswale Installation — common questions

Not if it drains within a day or two, which is the design goal. Mosquitoes need standing water for longer than that to breed. Timing can vary with weather, access and permits, so ask for a realistic window.

The size depends on the drainage area and soil. The contractor calculates it, often sizing the garden at a fraction of the roof or paved area. Raise any questions at the estimate stage so there are no surprises later.

Yes, with soil amendments or an underdrain. The contractor tests drainage and designs for it. A short written scope keeps expectations clear for both sides. Your provider can explain how this applies to your property before you book.

Some water agencies and cities offer rebates or design help. Ask your contractor or district before you start. A short written scope keeps expectations clear for both sides.

A few days for a typical residential garden, depending on the size and soil. Planting season may influence timing. Raise any questions at the estimate stage so there are no surprises later.

The contractor guarantees workmanship for 60 days, including grade and overflow. Plant survival and extreme storms are not covered. Timing can vary with weather, access and permits, so ask for a realistic window.

Didn’t find your answer? Nova, our AI assistant, is in the chat bubble in the bottom-right corner and can help anytime.

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