Read the stain pattern
| Pattern | Likely source |
|---|---|
| Arcs on walls and fences where sprinklers hit | Iron in irrigation well water |
| Rings in toilet tanks and bowls, on a well | Iron in a private well |
| Short burst of brown water after street work | Sediment stirred in the mains |
| Rust at one old fixture | Corroding galvanized or steel pipe |
Why sprinkler water stains
Shallow groundwater can carry dissolved iron. It looks clear coming out of the pump, then oxidizes when it meets air and dries into orange deposits. Every watering cycle adds a layer. Miami-Dade's year-round watering rules apply to private wells as well as utility water: lawns get two days a week by address, outside the 10 a.m. to 4 p.m. window. Watering less often and keeping spray off walls both reduce stains.
WASD water and your pipes
WASD's plants lime-soften and filter the water and add a phosphorous compound for corrosion control. If you get brown water after work on a main, run the cold tap until it clears; if it does not, contact WASD. In an older home, rust that appears at just one fixture usually points to aging plumbing near that fixture, which is a job for a plumber rather than a filter.
Options for an irrigation well
- Iron filtration sized to the pump's flow.
- Oxidation plus filtration for higher iron levels.
- Head adjustments so water lands on grass, not walls.
- Connecting irrigation to another source, if practical, though utility water for lawns costs money too.
For a drinking well, see well water treatment.
Pools and screen enclosures
Pool owners sometimes top off with well water from a hose bib. If that water carries iron, it can stain plaster and tile and tint the pool. Screen enclosures and white aluminum frames show iron stains quickly too. If you see stains in either place, test the water source you use to fill or rinse before blaming the pool chemistry.
About existing stains
Fixing the water stops new stains but does not remove old ones. Rust removers made for stucco, pavers or pool tile work best, used exactly as directed and tested on a hidden spot. Clean after the water problem is solved, or the stains return.
Test it
Jorge tests the sprinkler water and the tap, explains the iron level, and tells you whether treatment is worth it. Call, text or WhatsApp (305) 793-5974.
https://www.miamidade.gov/global/water/conservation/outdoor-water-restrictions.page
https://www.miamidade.gov/resources/water/documents/2025-water-quality-report.pdf
https://www.cityofsweetwater.fl.gov/206/About-Us
Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist