Jacksonville, Florida Environment Guide

Six Jacksonville environment guides sit under this hub, and the table pairs each common question about the river, the marshes and the city canopy with a verified fact and the guide that covers it.

The Timucuan Preserve guide, the Nassau River-St. Johns River marshes guide and the Atlantic coast ecosystem guide cover the protected lands east and north of downtown Jacksonville; the St. Johns River watershed guide and the water quality guide cover the river and its creeks; and the tree protection guide covers the city canopy rules. Last verified: October 14, 2026, on the National Park Service, Florida Department of Environmental Protection, JEA and City of Jacksonville websites.

The Timucuan Ecological and Historic Preserve is a National Park Service unit in Jacksonville that protects salt marshes, coastal dunes and hardwood hammocks along with Fort Caroline and Kingsley Plantation (NPS).

Salt marsh makes up about 75 percent of Timucuan Preserve, and roughly 35,000 acres of salt marsh fall within its boundary (NPS salt marsh page). The park service credits that marsh with absorbing floodwater and buffering the shore from storm waves. The Theodore Roosevelt Area trails, also part of the preserve, sit inside the city of Jacksonville (NPS).

All park service areas of Timucuan Preserve close on Thanksgiving, which falls on November 26, 2026, and on December 25 and January 1 (NPS hours). Fort Caroline and Kingsley Plantation are closed Monday and Tuesday, so a weekday visit has to fall Wednesday through Friday. The preserve mailing address is 12713 Fort Caroline Road, Jacksonville, FL 32225, phone 904-641-7155 (NPS), and the preserve headquarters is open 7:45 a.m. to 4:15 p.m., Monday through Friday, closed on government holidays (NPS hours). The Timucuan Preserve guide and the Atlantic coast ecosystem guide go further into the marsh and the barrier islands.

The Nassau River-St. Johns River Marshes Aquatic Preserve, a 69,000-acre state preserve in Duval and Nassau counties established in 1969, protects the salt-marsh estuary of the Nassau Sound area between Jacksonville and Fernandina Beach (FDEP).

The Florida Department of Environmental Protection dates the official designation to Nov. 24, 1969, and describes the preserve as a vast salt-marsh estuary laced with interconnecting tidal creeks (FDEP). Birds listed for the preserve include clapper rails, wood storks, herons, egrets and ibis; mammals include river otters, bottlenose dolphins and manatees; reptiles include loggerhead and green sea turtles, diamondback terrapins and American alligators. The City of Jacksonville is one of the listed partner groups alongside the U.S. Fish and Wildlife Service, the U.S. Army Corps of Engineers and the Florida Fish and Wildlife Conservation Commission.

The primary goal of the 1969 designation was to protect the estuarine resources of the Nassau Sound marshes, and FDEP lists the preserve as a biological preserve (FDEP). Two Jacksonville guides divide the subject: the Nassau River-St. Johns River marshes guide covers the state preserve and its rules, and the Timucuan Preserve guide covers the federal park.

The 2025 State of the River Report, the eighteenth edition, finds a mixed picture for the Lower St. Johns River Basin: 49 tributaries are impaired in the 2022-24 state assessment, and 41 of them have confirmed human sources of contamination (UNF).

The report, produced by scientists at the University of North Florida, Jacksonville University and Penn State Berks, also flags rising total phosphorus in parts of the St. Johns River mainstem, persistently high levels in Deep Creek, a continuing decline in the commercial blue crab catch and submerged aquatic vegetation that has stayed severely depleted since 2017 (UNF). Its authors were scheduled to present the findings on Feb. 13, 2026, at the Environmental Symposium run by the City of Jacksonville Environmental Protection Board and the UNF Institute of Environmental Research and Education.

The tributary problem is old. The Florida Department of Environmental Protection says bacteria pollution was first documented in the St. Johns River in the 1950s, and that removing direct sewage discharges and hundreds of small package plants lowered bacteria levels in the main stem (FDEP Duval Tributary Watch). FDEP groups the Jacksonville tributaries into areas including Ortega and Cedar River, Broward River and Dunn Creek, Julington and Durbin Creeks, Pablo Creek, Mill Cove and Arlington, and Trout River, and a Lower St. Johns River fecal coliform BMAP working group is writing the cleanup plan. The Duval County Health Department permits septic tanks and issues advisories for the creeks. The St. Johns River watershed guide and the water quality guide cover monitoring in detail.

The City of Jacksonville and JEA Septic Tank Phase-Out Program, approved by City Council on August 23, 2016, has finished Biltmore C and Beverly Hills, started construction in Christobel and moved Riverview into design (JEA).

The program exists to cut the nutrients that leak from septic systems into the St. Johns River and other Jacksonville waterways (JEA). Each neighborhood must reach 70 percent property owner participation before a project is designed, bid and built. The JEA page still carries an expected Christobel start of April 2026 marked as highly subject to change, while its March 2026 update says construction has begun, so the newer update reflects current status. Low- to moderate-income residents can apply to the City of Jacksonville Utility Tap-In Program, which offers deferred payment loans for connection fees and plumbing.

The Jacksonville Tree Commission, set up under Ordinance Code Chapter 94, meets on the third Wednesday of each month from 9:30 to 11:00 a.m. in the Ed Ball Building, 10th floor, and its next meeting is October 21, 2026 (City of Jacksonville).

The Jacksonville Tree Commission scheduled a workshop on tree planting programs for October 14, 2026, and it runs several planting programs, including the 630-City Tree Planting Program and Level 2 and Level 3 programs with approved planting lists (Tree Commission). The public may comment before any final vote on a motion.

Jacksonville homeowners can call 630-CITY to request up to two trees for the right of way in front of a home, and Urban Forestry staff inspect the site first (City Urban Forestry FAQ). City foresters approve a removal only when an on-site risk assessment supports it, and healthy trees are protected under the City tree ordinance even when roots crack a sidewalk. When a removal of a city tree is denied, the owner can seek a permit from the Building Inspection Division at the owner's expense. The tree protection guide explains the charter amendment and the mitigation fund behind these rules.