Why sprinklers leave orange fans
UF/IFAS's Florida-Friendly Landscaping program points out that most Florida well water is high in iron and that iron-rich irrigation water is behind the orange streaks often seen on the sides of buildings. In the well, iron is dissolved. Once sprinklers spray it into the air and onto concrete, stucco, coral stone or pavers, it oxidizes into rust and sticks. The pattern is the clue: fan shapes that line up with sprinkler heads.
City water in Fort Lauderdale is a different story
The city's 2025 Water Quality Report says its water is softened, filtered, aerated and cleaned to remove naturally occurring minerals and particles before it is disinfected with chloramines. The new Prospect Lake Clean Water Center, which opened in October 2026 and uses nanofiltration and ion exchange, is designed to improve clarity and taste. Color changes on city water do happen: the city has explained that water from its different plants can look slightly different, and maintenance can shift which plant serves a neighborhood. That is a temporary tint, not the dense orange staining of well irrigation.
Other sources of rust
- Older plumbing: galvanized steel pipes in older homes can release rust, especially after water sits. Water that runs clear after a minute points here.
- Water heater: rusty hot water only can mean a corroding tank.
- Iron bacteria in a well: the Department of Health lists red stains, slimy rust-colored growth in toilet tanks and swampy odors as signs.
Stopping new stains
Options depend on where the iron comes from:
| Source | Typical approach |
|---|---|
| Irrigation well | Iron treatment at the well, configured from the iron level and sprinkler demand; adjust heads away from walls |
| Drinking well | A well water system configured from the test, such as oxidation and filtration |
| Old pipes or heater | A plumber |
Existing stains need a rust remover suited to the surface; treatment prevents new ones. South Florida Water Management District irrigation rules, including no watering between 10 a.m. and 4 p.m., apply to private wells too, so less frequent watering also means less iron landing on walls.
Test before you treat
Iron equipment that is wrong for the water clogs or stops working. Before buying, you want iron, pH, hardness and whether there is also a sulfur smell. Jorge tests your water free in Fort Lauderdale, tells you what is staining what, and recommends treatment only when it fits. Call, text or WhatsApp (305) 793-5974.
https://ffl.ifas.ufl.edu/resources/ffl-minute-radio/2020-archive/september-2020/iron-in-water/
https://www.fortlauderdale.gov/files/d3f21c58-5644-4f14-9cf9-49b1020de2fd/2025-Water-Quality-Report.pdf
https://www.fortlauderdale.gov/Residents/City-News/Fort-Lauderdale-Celebrates-Opening-of-Prospect-Lake-Clean-Water-Center
https://www.fortlauderdale.gov/Residents/City-News/Water-T-Plant-Maintenance-March-30-April-5-Change-in-Water-Color-Possible
https://www.floridahealth.gov/wp-content/uploads/2025/08/well-water-facts-odor-staining.pdf
https://www.sfwmd.gov/community-residents/landscape-irrigation
Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist