You’ve got mangroves along your waterfront, and you’d like a little more of that view back. Before you or anyone you hire touches a branch, here’s a real number worth knowing: a Port St. Lucie resort recently paid $110,395 in state fines, plus a $72,000 county mitigation payment, for illegally cutting mangroves down to nubs. Understanding the Florida Mangrove Trimming and Preservation Act Explained here means starting with what actually happens when this law gets ignored, because that’s the part most guides skip entirely. What follows is the real text of the law, what you can legally do without a permit, and what triggers consequences like that.
Quick note before we continue: this reflects the current text of Fla. Stat. §§403.9321–403.9333 and its administering agency’s public guidance as of the date above. It’s general information, not legal advice — confirm your specific situation with FDEP or your local delegated authority before you or a contractor touches a mangrove.
What the Mangrove Trimming and Preservation Act Actually Says
The Florida Mangrove Trimming and Preservation Act, codified at Fla. Stat. §§403.9321–403.9333, protects all three native mangrove species statewide and is administered by the Florida Department of Environmental Protection, with permitting authority sometimes delegated to local governments.
The Mangrove Trimming and Preservation Act — Fla. Stat. §§403.9321 through 403.9333 — treats mangroves as a protected coastal resource, not a landscaping shrub you can shape freely. It covers all three native species found in Florida: red mangrove (Rhizophora mangle), black mangrove (Avicennia germinans), and white mangrove (Laguncularia racemosa). Size and age don’t matter under the statute — a three-foot sapling gets the same protection as a mature specimen.
The Florida Department of Environmental Protection (FDEP) administers the Act statewide. Under §403.9324, local governments can apply for and receive delegated permitting authority within their jurisdiction — meaning depending on where your property sits, you might be dealing with FDEP directly, or with a local agency that’s taken over that role. We’ll get into how to tell which applies to you further down.
Who Can Trim Without a Permit — and Who’s Exempt
The Exact Exemption Thresholds
Florida homeowners can trim mangroves without a permit if the mangroves are on land they own or control, don’t exceed 10 feet in pretrimmed height, aren’t cut below 6 feet remaining height, sit on a shoreline of 150 feet or less, and no herbicide is used.
Here’s the exemption, stated exactly rather than approximately, because the numbers are what actually matter:
- The mangroves must be on land you own or control, or on the sovereign submerged land immediately waterward of your property.
- Pretrimmed height cannot exceed 10 feet, measured from the substrate.
- You cannot trim any mangrove down below 6 feet in overall height, also measured from the substrate.
- This exemption applies to shorelines of 150 feet or less.
- No herbicide or other chemical can be used to remove mangrove foliage under this exemption.
Meet all five conditions, and you can trim without applying for a permit first.
Who This Exemption Does NOT Cover
The Florida mangrove trimming exemption does not cover mangroves taller than 10 feet before trimming, shorelines longer than 150 feet, or trimming that would reduce a mangrove below 6 feet in height.
If your mangroves are already over 10 feet tall, your shoreline runs longer than 150 feet, or the trim you want would bring a mangrove below the 6-foot floor, you’re outside this exemption — full stop, regardless of how reasonable the trim seems. Multifamily residential properties have an additional wrinkle: the statute’s stated intent requires an equitable distribution of trimming rights among unit owners, which typically means more coordination than a single-family exemption trim.
What Happens If You Violate the Mangrove Trimming and Preservation ActViolating Florida’s mangrove trimming law can result in state fines, mandatory mitigation payments, and required replanting — with property owners presumed responsible even when a hired contractor performed the actual work.
This is the part worth understanding before you pick up a saw, or hire someone who will. The consequences here aren’t hypothetical. A resort in Port St. Lucie paid $110,395 in state fines after illegally cutting roughly 944 mangroves down to nubs along the St. Lucie River — on top of that fine, it owed $72,000 to the county for a mitigation plan and had to replant 2,780 red, black, and white mangrove seedlings between the remaining roots. In a related case, an unpermitted landscaper who trimmed mangroves over 10 feet tall without DEP authorization was fined $2,700 separately.
Here’s the detail that catches property owners off guard: the statute presumes a violation occurred with the knowledge and consent of the property owner, even if a hired contractor did the actual cutting. That presumption is rebuttable with competent evidence that the owner didn’t authorize the work, but the default position places responsibility on you, not just whoever held the saw. Hiring someone who assures you “it’s fine” doesn’t transfer that risk away from your property.
How to Legally Trim or Get Permission for Larger Work
To legally trim mangroves beyond the exemption thresholds, Florida property owners must hire a DEP-qualified Professional Mangrove Trimmer or apply for a general or individual permit through FDEP or the delegated local authority.
- Confirm whether you qualify for the exemption first — measure pretrimmed height, remaining height after the planned trim, and your shoreline length against the thresholds above.
- If you’re outside the exemption, hire a Professional Mangrove Trimmer. Under Fla. Admin. Code R. 61G10-17.001, this credential belongs to registered landscape architects who hold a valid Florida license, understand mangrove physiology, and comply with the Act’s provisions.
- If the work exceeds what a Professional Mangrove Trimmer can authorize on their own, apply for a DEP general or individual permit before any cutting begins.
- Keep documentation of who performed the work and under what authorization, given the owner-presumption doctrine above.
State Law vs. Local Delegation — Which One Wins?
The Florida Department of Environmental Protection holds primary authority over mangrove trimming statewide, but individual counties or cities can receive delegated permitting authority under Fla. Stat. §403.9324, meaning the correct contact varies by location.
FDEP is the default authority everywhere in Florida. But §403.9324 allows local governments to apply for and receive delegation of that permitting authority within their own jurisdiction. Where delegation has happened, your local government — not FDEP directly — is who administers permits and enforces the rules day to day. Since delegation status varies by county and city, the practical answer to “who do I actually call” depends on where your property sits; check with your local environmental or building department first, and they’ll tell you whether they hold delegated authority or whether you need to go to FDEP directly.
Recent Changes You Should Know About (2024–2026)
A 2023 amendment to Fla. Stat. §403.9324 through Senate Bill 100 directed FDEP to develop mangrove replanting and restoration rules focused on erosion-prone areas, barrier islands, and the Biscayne Bay Aquatic Preserve.
In 2023, Senate Bill 100 amended §403.9324 to require FDEP to adopt rules specifically for mangrove replanting and restoration, with particular attention to erosion in areas of critical state concern, protection of barrier and spoil islands, and partnership with local governments to identify vulnerable properties. It also explicitly called for shoreline design work tied to the Biscayne Bay Aquatic Preserve. This shifts some of the Act’s recent regulatory attention toward restoration and erosion planning, on top of its original trimming and preservation framework.
When to Call a Professional
A certified Professional Mangrove Trimmer is worth hiring even for borderline-exempt situations, since the cost of a professional trim is far lower than the potential fines and mitigation costs of getting the exemption thresholds wrong.
Given how specific the exemption’s numbers are — and how much responsibility the owner-presumption doctrine places on you regardless of who does the cutting — a professional mangrove trimming service is worth the cost even when you think you might qualify for the exemption yourself. Getting the height measurements wrong by even a foot is the difference between a routine trim and a violation.
FAQs
Yes, but only within specific limits. Homeowners can trim mangroves without a permit if the mangroves are on their own property, don’t exceed 10 feet in pretrimmed height, aren’t cut below 6 feet remaining height, and the shoreline is 150 feet or less.
You can trim mangroves up to 10 feet in pretrimmed height down to no lower than 6 feet remaining height, on a shoreline of 150 feet or less, without herbicide use — as long as all conditions are met together.
The exemption covers trimming on land you own or control, mangroves under 10 feet pretrimmed height, trimming that doesn’t reduce height below 6 feet, shorelines of 150 feet or less, and no chemical defoliation.
Consequences can include state fines, mandatory mitigation payments to the county or state, and required replanting — as seen in a Port St. Lucie case that resulted in over $180,000 in combined fines and mitigation costs.
Potentially, yes. The statute presumes a violation occurred with the property owner’s knowledge and consent, even when a hired contractor did the actual work. This presumption can be rebutted with evidence, but the default responsibility sits with you.
A Professional Mangrove Trimmer is a registered landscape architect who holds a valid Florida license, understands mangrove physiology, and complies with the Act’s provisions under Fla. Admin. Code R. 61G10-17.001.
It depends. FDEP holds primary authority statewide, but individual counties and cities can receive delegated permitting authority under §403.9324. Check with your local environmental department to confirm which applies to you.
Trimming within the exemption thresholds may not require a permit, while removal — eliminating a mangrove entirely — generally requires a permit and is treated far more strictly under the Act.
Costs vary based on shoreline length and the scope of work involved. For a fuller picture of coastal tree service pricing in Florida, see our coastal tree removal guide.
Final Word
The Mangrove Trimming and Preservation Act gives Florida waterfront homeowners real room to maintain their view — but the exemption’s numbers are exact, not approximate, and the owner-presumption clause means the responsibility doesn’t disappear just because you hired someone else to do the cutting. Know your height and shoreline measurements before anyone picks up a saw, and when you’re near the edge of the exemption, a licensed professional costs far less than a violation does.
