How do we maintain a rain garden or bioswale on HOA common area?

By OurHOA · General information · Revised October 25, 2026

How an HOA board keeps a rain garden or bioswale draining: storm inspections, sediment and inlet cleanout, plants and mulch, mosquito complaints, and permit duties.

Part of the HOA board handbook: vendors, projects and upkeep.

The short answer

A rain garden or bioswale is a planted low spot built to catch runoff from roofs, streets or parking and let it soak into the ground. It does its job only while three things stay true: water can get in, the surface is not sealed over with silt, and the plants are alive. Almost all of the maintenance comes back to those three. The EPA's semi-arid green infrastructure toolbox lists the core tasks as clearing out debris and trash, checking for long-term ponding, and replacing wood or rock mulch and dead plants. For a typical HOA that means a walk after heavy storms, a spring and a fall work day, fresh mulch once a year, and a written log. Before any of that, find out whether the feature is part of a permitted stormwater system. If it is, the association may owe inspections and reports to a government agency, not only good looks to its owners. Rules vary by state, by city and by your governing documents, so treat this as general education, not legal advice.

Find out whether a permit or agreement covers it

Many rain gardens and swales in newer subdivisions were built to meet stormwater requirements when the land was developed, and that leaves paper behind: a plat note, a recorded maintenance agreement, or a permit that the developer transferred to the association at turnover. Pull the plat, the common area and maintenance articles of the declaration, and the turnover files. Then call the city or county stormwater office and ask whether the feature is on its list of private stormwater controls. In Florida, most surface water management systems sit under an environmental resource permit, and the operation and maintenance entity named on it, often the HOA, has inspection duties under Rule 62-330.311 of the Florida Administrative Code. Revisions that took effect June 28, 2024 added a periodic inspection routine with results reported to the permitting agency, and the DEP's resource page lists a qualified inspector requirement in section 12.5(c) of Applicant's Handbook Volume I. Ask your water management district which schedule and forms apply to your permit. In Texas the duty usually comes from the city. Austin, for example, says property owners must keep stormwater control measures working, inspects most surface controls every three years, and may charge a $500 re-inspection fee for noncompliance. In Colorado, Colorado Springs requires a maintenance agreement for permanent stormwater facilities that binds the owner and all future owners, wants an annual inspection report with maintenance forms by May 31, and gives the city authority to do the maintenance itself if the owner does not. If you find no permit or agreement at all, the feature is still common area, and the declaration almost certainly makes the association responsible for it.

What to check on each inspection

Walk the garden once during or just after a heavy rain and again about a day later. The two visits answer different questions. During the storm, look at whether water actually reaches the garden or runs past the curb cut, whether it spreads across the bed or cuts a channel, and whether the overflow carries the excess away without washing out the edge. A day later, look for standing water. The Kentucky Division of Water says water should stand in a rain garden no longer than 24 hours after the rain stops, and that mosquitoes cannot complete their breeding cycle in that time. The EPA toolbox says a rain garden without an underdrain should be able to drain dry within 6 to 12 hours, which generally takes soil that soaks in half an inch or more per hour. Water that is still there after a full day means something is clogged or compacted. On the same walk, check the inlets and curb cuts for leaves, trash and fans of sand or gravel; the side slopes for rills, bare soil and animal burrows; the plants for dead patches, weeds and tree seedlings; the mulch for washouts or piles near the outlet; and any underdrain cleanout caps or overflow grates. Take dated photos from the same three or four spots every time so the board can compare one year to the next.

A sample year you can adapt

Adjust the months to your climate; in Florida and South Texas the dry season, not winter, is the slow period. Early spring: cut back last year's dead stems, pull weeds, shovel out sediment at each inlet, replace dead plants and lay new mulch. EPA's guidance says to replace the mulch layer every year. After every heavy storm: one director or the landscaper walks the garden within a day and logs any ponding still present at 24 hours. Summer: hand weed monthly and water new plants. The Kentucky fact sheet calls for regular watering during the first two years and in dry spells. Fall: clear leaves from inlets and the bed before the first big leaf drop clogs them, then repeat the full inspection. Winter in Colorado: stake the edges and tell the snow contractor not to pile snow on the garden. EPA warns that piled snow compacts the soil media, which can cut its drainage enough to cause ponding and failure. Once a year: file any inspection report the permit or city requires, review the log at a board meeting, and set the next year's budget.

Fixes when it stops draining

Work from cheap to expensive. First, clear the inlet; a single clump of leaves at a curb cut can send all the runoff down the street. Second, look at the surface. Silt settles on top of the mulch, and EPA lists failing to remove it as one of the common mistakes. Scrape the crust off, haul it away, and loosen the top couple of inches by hand without driving equipment into the bed. Third, if the design has an underdrain or an outlet, open the cleanouts and make sure the pipe is not blocked. If the garden still holds water for more than a day after all three, the soil underneath is probably clogged or compacted, and the fix is digging out and replacing the media. That is a job for a contractor working from the original design, and if the system is permitted, ask the agency whether the work needs approval first. Two shortcuts make things worse. Filling the low spot with topsoil to get rid of a puddle removes the storage the garden was built to hold. Turning it into lawn ends the problem for owners and creates a bigger one with the permit.

Write it into the landscaping contract

In most self-managed HOAs the mowing crew ends up caring for the rain garden by default, and crews trained on turf tend to mow it short, blow clippings into it, or spray it like a lawn. Put the garden in the contract as its own line with a map. Useful scope lines include: no mowing or string trimming inside the planted area; hand weeding monthly during the growing season; sediment and trash removal at every inlet on each visit; mulch replaced once a year with a type that stays put when water flows over it, or rock where the design calls for it; no fertilizer unless the board approves it in writing; no clippings or leaves blown into the bed; and a photo sent to the board whenever water is standing a day after rain. Ask bidders whether their crews have maintained bioretention before, and price the spring cleanout separately so the board can see what it costs. Our guide on hiring an HOA landscaping contractor covers the bid process itself.

Answering owners who complain about it

The usual complaints are that the garden looks weedy, that it holds water, and that it breeds mosquitoes. Take the second and third seriously, because water standing past a day is a maintenance problem, and our guide on setting up an HOA mosquito control program covers what to do beyond fixing the drainage. The first is often a matter of explaining what the garden is for. A short note in the newsletter or on a small sign helps. Wording you can copy: 'The planted area at the corner of Elm and Third is a rain garden. It is designed to hold rainwater from the street for less than a day and let it soak into the ground, which keeps sediment and lawn chemicals out of the creek. The plants are native and are cut back each spring. If you see water standing more than a day after a storm, please email the board with a photo so we can have the inlet cleared.' Ask owners not to dump grass clippings, pet waste or pool water into it.

Mistakes boards make, and a motion to adopt a schedule

The most common mistake is losing the paper trail at turnover and learning about a permit only when an inspection notice arrives. The second is having no budget line. Florida's DEP now asks operation and maintenance entities to estimate routine maintenance costs and certify that they can pay for them, which is good practice anywhere. Put annual mulch, plants and sediment removal in the operating budget, and ask your reserve study provider to include eventual media replacement. The third is waiting for complaints instead of inspecting on a schedule. If your garden drains into a pond, pair this schedule with the one in our guide on setting up an HOA retention pond maintenance schedule. A motion you can adapt: 'Move to adopt the rain garden and bioswale inspection and maintenance schedule dated [date], to assign [director] to keep the inspection log and file any reports the city or permitting agency requires, and to add $[amount] to the [year] landscape budget for mulch, replacement plants and sediment removal.' Record the vote in the minutes and keep the log with the association's records.

Sources

These guides are general education for HOA boards and residents, not legal, tax, or financial advice. Rules vary by state and by your community's governing documents - check with a professional for your situation.

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