How do we plan a dredging project for our HOA's stormwater or retention pond?

By OurHOA · General information · Revised September 27, 2026

How an HOA board plans a pond dredging project: sediment survey, Corps and state permits, testing and hauling spoils, unit-price bids, owner notice and a timeline.

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

The short answer

Measure first, permit second, bid third. Hire a surveyor or pond engineer to measure how much sediment is in the pond and compare it to the design depth on the as-built plans. Take that volume to the Corps of Engineers district, your state or water management district, and the city stormwater office, and find out what each one needs before any machine touches the water. Decide where the removed muck will go, because hauling and disposal often decide the price. Then bid the job by the cubic yard against a written scope, tell owners about truck traffic and torn-up turf, and hold back money until the finished pond is surveyed again. Plan on six to twelve months from the first survey to the last load. This guide covers the project itself. If you are still sorting out whether the association owns the pond, start with our guide on who maintains the stormwater or retention pond in an HOA, and for routine upkeep see our guide on setting up a retention pond maintenance schedule. Rules vary by state, by city and by your recorded documents. This is education, not legal or engineering advice.

Measure the sediment before you price anything

A lump-sum quote after a walk around the bank is a guess, usually a padded one. Get a bathymetric survey instead: a crew in a small boat takes depth readings on a grid, probes down to the firm bottom, and produces a map showing sediment thickness across the pond. Ask the surveyor to compare it against the design bottom elevations on the as-built plans and to report the volume to be removed in cubic yards, split between the forebay and the main pool. That split matters. EPA's wet pond fact sheet describes the forebay as a small pool, typically about 10 percent of the permanent pool's volume, built so that coarse sediment settles there and crews can clean the forebay without dredging the whole pond. If most of the sediment sits in the forebay, you may have a small job instead of a large one. The arithmetic is simple enough to check yourself. A half-acre pond is about 21,780 square feet. Two feet of sediment across all of it is 43,560 cubic feet, and dividing by 27 gives roughly 1,610 cubic yards. Multiply that by the per-yard prices in your bids and you have the real number to compare against the reserve study.

Sort out the permits before you ask for bids

Up to three agencies may have a say, and none speaks for the others. The Corps of Engineers regulates dredged or fill material in waters of the United States under section 404 of the Clean Water Act. Nationwide Permit 43, reissued in the 2026 nationwide permits that took effect March 15, 2026, covers maintenance of stormwater management facilities where a section 404 permit is required. Its text says maintenance of a facility that contains no waters of the United States does not need a section 404 permit, and that maintenance limited to restoring the original design capacity needs no pre-construction notification. Whether your pond contains jurisdictional water is a question for the Corps district, and districts add their own regional conditions. Email the district regulatory office with the survey, the plans and a site map, and keep the reply. Florida adds its own layer. Section 403.813(1)(f) of the Florida Statutes exempts some maintenance dredging of manmade canals, channels and similar structures, but only when spoil goes to a self-contained upland site, dredging stops at the original design configuration, and erosion and turbidity controls stay in place. Ask your water management district in writing whether your pond work falls under that exemption, under the operation and maintenance terms of your existing environmental resource permit, or needs its own authorization. Then count the ground you will disturb on land. Federal rules at 40 CFR 122.26(b)(15) treat clearing, grading and excavating of one acre or more as small construction activity. In Texas that means coverage under TCEQ's construction general permit, TXR150000, which calls for a stormwater pollution prevention plan and a posted site notice. Colorado runs its own construction permit, COR400000, through the Department of Public Health and Environment. Drying beds, staging areas and haul routes all count toward the acre, so a pond job can cross the line even when the pond is small. Finally, call the city or county stormwater office. They hold your maintenance agreement and may want notice before work starts.

Decide where the spoils go

Pond sediment is wet, heavy and sometimes dirty. It has to be dewatered, either by drawing the pond down and letting the bottom dry or by pumping slurry into bags or drying beds, and then it has to go somewhere. Hauling it off site is the cleanest option and often the most expensive. Spreading it on association land is cheaper if you have the space and the permits allow it. Test before you decide. Street and parking lot runoff carries metals and oils into the pond, and parking lot sealcoat can add more. Minnesota's Pollution Control Agency found coal tar-based sealants were the largest source of polycyclic aromatic hydrocarbons in urban pond sediment, at 67.1 percent, and its guidance sorts dredged material into levels that limit where it can go, with the most contaminated going to a solid waste landfill. Your state's rules will differ, but the lesson carries: have the engineer sample the sediment and put the results in the bid package, so bidders price the disposal they will actually face instead of adding a cushion for the unknown. Plan the access route too. Loaded dump trucks and track machines will cross common area turf, sidewalks and possibly an owner's side yard under a drainage easement. Photograph everything along the route before work starts, and write restoration into the scope.

Write the bid package around unit prices

Ask every bidder to price the same line items. A workable list is mobilization and demobilization, erosion and turbidity controls, dewatering or pond drawdown, sediment removal per cubic yard, hauling and disposal per cubic yard or per ton, outlet and bank repairs as a separate item, turf and sidewalk restoration, and the final survey. Pay for sediment by the cubic yard as measured by a before-and-after survey, not by truckloads counted by the contractor. Require proof of insurance naming the association, a written plan for where the machines will sit and how they will reach the water, and references from at least two pond or stormwater jobs of similar size. Write a retainage percentage into the contract and hold it until the post-dredge survey confirms the design depth and the turf is restored. In Florida, section 720.3055 of the Florida Statutes requires competitive bids when a services contract will cost the association more than 10 percent of its total annual budget including reserves, and at a small association a dredge job crosses that line easily. Our guide on how to write an HOA request for proposal covers scoring bids side by side.

A sample timeline

Month 1: board authorizes the bathymetric survey and pulls the as-built plans, the stormwater permit and the maintenance agreement. Month 2: survey results in. Engineer samples the sediment and drafts the scope. Months 2 to 4: permit questions go to the Corps district, the state or water management district, and the city. Wait for written answers. Month 4: bid package goes out with a three-week deadline and a site walk. Month 5: board compares bids and votes at a noticed meeting. Owner notice goes out at least 30 days before mobilization. Months 6 to 7: work happens, ideally in the drier season for your region so drawdown and drying go faster. Month 8: post-dredge survey, final walk, turf restoration, retainage released. Build slack into every step. Agency replies and dry weather rarely run on schedule.

Wording for the motion and the owner notice

A motion can read: 'Move to award the stormwater pond sediment removal contract to [contractor] at the unit prices in its bid dated [date], with total payment for sediment removal not to exceed $[amount] based on the engineer's estimate of [number] cubic yards, to be paid from the reserve fund, with 10 percent retainage held until the post-dredge survey confirms design depth.' A notice to owners can read: 'Starting on or about [date], a contractor will remove built-up sediment from the pond at [location] so it holds the storm runoff it was designed for. Expect trucks entering through [gate or street] on weekdays between [hours] for about [number] weeks. The water level will drop and the pond may smell while the bottom is exposed. Please keep children and pets away from the equipment and the banks. The contractor will repair any turf it damages. Questions go to [contact].'

Mistakes that turn a dredge job into a special assessment

Leaving the pond off the reserve study, so a predictable bill shows up all at once. Taking a lump-sum price with no survey behind it, then arguing with the contractor about whether the job is finished. Assuming the pond is exempt from every permit because it is private, or assuming the landscaper already checked. Skipping sediment testing and learning at the landfill scale house that the material costs twice as much to dispose of. Paying in full before anyone confirms the pond reached design depth. And dredging the whole pond when cleaning the forebay would have done the job. Fix the first one this budget season: add the pond to the reserve component list with the surveyed volume and a real cost, and fund it every year.

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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