Irrigation Systems in South Florida — What Every Homeowner and Contractor Needs to Know
Irrigation Systems in South Florida
South Florida's irrigation landscape is unlike any other US market. The South Florida Water Management District (SFWMD) enforces day-of-week watering restrictions that apply across all five counties. Multiple municipalities layer additional restrictions on top. Florida law mandates rain sensors on every new system. And salt water intrusion, heavy clay in some areas, and dramatic pH variation create technical challenges that generic irrigation guides don't address.
This guide covers everything homeowners and contractors need to know to design, install, and maintain irrigation systems that comply with South Florida's complex regulatory environment.
SFWMD Watering Restrictions — The Foundation
SFWMD's year-round landscape irrigation restrictions apply throughout Miami-Dade, Broward, Palm Beach, Collier, and Monroe counties. These are minimums — municipalities can and do add restrictions.
Standard restrictions (non-drought):
- Landscape irrigation: 2 days per week maximum
- Microirrigation (drip, soaker, micro-spray): 3 days per week
- No irrigation between 10am and 4pm (any day)
- New plantings: Permitted to water daily for first 30 days with documentation
Day-of-week assignment: Day assignment is based on the last digit of your street address and your municipality. Verify your current schedule at sfwmd.gov — do not rely on memory or a neighbor's schedule.
Drought phases: When SFWMD declares drought, restrictions escalate. Phase 1 drops to 1 day per week. Phase 2 restricts hours further. Phase 3 allows hand-watering only. Build drought-tolerant plant selections into every design — the question is not whether drought phases will be declared, but when.
Rain Sensors — Florida Law Requires Them
Florida Statute 373.62 requires rain sensors (or soil moisture sensors) on all new automatic irrigation systems installed after May 1, 1991. The requirement is widely ignored on older systems — but any system upgrade or permit application will trigger compliance review.
Types that meet Florida requirements:
- Rain sensors (most common): Interrupt system when rainfall exceeds a threshold (typically ⅛ inch to ¾ inch, user-adjustable)
- Soil moisture sensors: More accurate; prevent irrigation when soil has adequate moisture
- ET-based smart controllers with integrated weather data: Meet and exceed the rain sensor requirement
Cost: A basic rain sensor costs $25-$45 and takes 20 minutes to install. There is no legitimate reason any South Florida irrigation system lacks one.
Drip vs. Spray — Matching System to South Florida Plant Types
South Florida Irrigation Method Selection Guide 2026
| Application | Recommended Method | Efficiency vs. Spray | SFWMD Days Allowed |
|---|---|---|---|
| Landscape beds, hedges, shrubs | Drip emitters or micro-bubbler rings | 30–50% savings | 3 days/week |
| Trees (establishment) | Drip ring around root zone | 40–60% savings | 3 days/week |
| St. Augustine and Zoysia turf | Rotary heads or rotors | 15–25% savings vs pop-ups | 2 days/week |
| Groundcovers, annuals | Micro-spray heads | 20–35% savings | 3 days/week |
| Coastal salt-spray zones | Drip only — spray heads spread salt deposits | Required for plant health | 3 days/week |
| Impervious surfaces (driveways, roofs) | No irrigation permitted on impervious surfaces | N/A | Prohibited |
SFWMD microirrigation (drip, soaker, micro-spray) is permitted 3 days per week vs. 2 days for conventional spray heads. Converting landscape beds from spray to drip increases both water efficiency and irrigation days allowed — a double benefit. Source: SFWMD Year-Round Irrigation Restrictions; Florida Statute 373.62; FloridaLandscapeIQ field data, 2026.
Backflow Preventer Requirements
Florida requires backflow prevention devices on all irrigation systems connected to potable water supplies. The requirement exists because irrigation systems, if improperly sealed, can draw contaminated groundwater back into the drinking water supply.
Required in South Florida:
- All new irrigation installations: Dual check-valve or pressure vacuum breaker required
- Inspected by municipal building department on new system permits
- Annual testing required in some municipalities (Broward County enforces this)
Salt water intrusion note for coastal properties: In coastal areas of Miami Beach, Key Biscayne, and the Florida Keys, saltwater intrusion into shallow groundwater is documented. Contractors designing systems with any groundwater connection must account for this risk.
The Permit Process for New Systems
New irrigation system installation generally requires a permit in most South Florida municipalities. The typical process:
- Licensed irrigation contractor submits plans showing heads, zones, and connection point
- Backflow preventer type and rain sensor specified
- Permit issued (typically 5-15 business days)
- Rough-in inspection before covering irrigation lines
- Final inspection including rain sensor test
Miami-Dade specific: Irrigation permits in Miami-Dade require a licensed irrigation contractor (not just a general landscape contractor). Verify contractor credentials at miamidade.gov/building.
Find licensed irrigation contractors through the FloridaLandscapeIQ Contractor Directory.
Source: Florida Statute 373.62 (rain sensor requirement); SFWMD Year-Round Irrigation Restrictions; South Florida Water Management District; FloridaLandscapeIQ Editorial Team, May 2026.