St. Johns County, FL Stormwater Regulations

St. Johns County holds a Phase II Small MS4 NPDES permit and is one of the fastest-growing counties in Florida. FDEP and the St. Johns River Water Management District share regulatory authority over stormwater. St. Augustine's historic district adds a unique review layer. FDEP penalties reach $10,000 per day for violations.

Primary source: Florida Department of Environmental Protection (FDEP) NPDES Stormwater Program

Permit Requirements

St. Johns County follows northeast Florida's dual-authority permit model. SJRWMD administers Environmental Resource Permits (ERPs) for stormwater management system design, and FDEP's NPDES Construction Generic Permit covers land disturbance of one acre or more.

The ERP requires stormwater systems to meet water quality treatment standards, including treatment of the first inch of runoff. Florida's SB 7040 nutrient standards may require enhanced nutrient removal for projects discharging to impaired waterbodies, which includes several waterways in St. Johns County.

St. Johns County's engineering department reviews stormwater management plans as part of the development approval process. The county has dramatically increased its permit review capacity to handle the volume of applications generated by the Nocatee master-planned community, World Golf Village area, and other rapidly developing corridors along I-95 and US-1.

Inspection Obligations

Active construction sites must be inspected per the NPDES Construction Generic Permit schedule. St. Johns County conducts its own construction site inspections in the urbanized MS4 area, with particular attention to the high-volume development corridors.

Post-construction BMPs require annual inspections and maintenance certification by the property owner. St. Johns County tracks its growing inventory of permitted stormwater facilities. The rapid pace of development means the county adds hundreds of new stormwater ponds and BMPs to its tracking database each year.

HOAs in master-planned communities like Nocatee, Julington Creek, and World Golf Village maintain large numbers of stormwater ponds and detention facilities. These HOAs must conduct annual inspections and maintain documentation for all facilities under their maintenance responsibility.

Penalty Structure

FDEP can impose penalties up to $10,000 per day per violation under the Florida Clean Water Act. State enforcement covers NPDES permit violations, unauthorized discharges, and water quality standard exceedances.

SJRWMD enforces ERP violations with administrative orders, penalties, and permit modification or revocation. The district's compliance staff monitor major development projects and investigate complaints about stormwater system performance.

St. Johns County enforces its local stormwater ordinance through notices of violation, stop-work orders, fines, and permit denial. The county has increased enforcement resources as development has accelerated, with dedicated stormwater compliance staff who inspect both active construction sites and existing facilities.

Key BMPs

• Wet detention ponds - The dominant BMP in St. Johns County's residential developments. Master-planned communities like Nocatee contain hundreds of stormwater ponds within interconnected drainage systems.
• Dry retention systems - Used where permanent pools aren't feasible. St. Johns County's sandy soils support retention and infiltration in many areas.
• Bioretention systems - Increasingly specified for commercial projects, particularly in the Ponte Vedra and US-1 commercial corridors.
• Coastal BMPs - Beachfront properties in St. Augustine Beach, Ponte Vedra Beach, and Vilano Beach require stormwater systems designed for CCCL compliance, storm surge resilience, and saltwater conditions.
• Stormwater harvesting - Growing adoption for irrigation reuse in golf course communities and larger commercial developments, reducing discharge volumes.

Local Ordinances

St. Johns County's stormwater management ordinance implements its MS4 permit requirements and Florida's stormwater regulations. The ordinance covers erosion control, post-construction stormwater management, maintenance agreements, and enforcement provisions. The county has updated its ordinance multiple times to keep pace with growth.

The City of St. Augustine has its own stormwater regulations within its municipal limits. The historic district's drainage system, much of which dates to the 19th and early 20th century, requires specialized approaches to stormwater management that balance historic preservation with modern drainage needs.

St. Johns County participates in the Community Rating System (CRS) under the National Flood Insurance Program. Development within FEMA flood zones must comply with the county's floodplain management regulations. The county's CRS rating provides flood insurance premium discounts to property owners, which creates an incentive for maintaining stormwater compliance.