Four common sources
| What you see | Likely source |
|---|---|
| Brown or yellow water for a minute in the morning, then clear | Galvanized iron pipe inside the house |
| Discolored hot water only | Water heater sediment or corrosion |
| Brown water across several taps for a few hours | Main break, construction or hydrant flushing |
| Orange streaks on stucco, pavers or a pool deck | Irrigation water from a well |
Galvanized pipe, in NMB's own words
NMB Water's website explains that many houses have galvanized iron pipe, and when the zinc coating inside wears thin, water touching the bare iron becomes discolored. The longer water sits, the worse it looks, which is why it shows up first thing in the morning. If only a few taps are affected, only part of the plumbing is galvanized. NMB's 2025 report adds that a licensed plumber should check for old galvanized pipes, and if none are found, you should flush the water heater and household plumbing at least twice a year.
A filter at the main line does not stop rust that forms after it, inside your own pipes. Repiping is a plumbing job; Jorge will say so plainly if that is your situation.
When the whole area turns brown
NMB's guidance for brown, red, orange or yellow water from the street side is to flush three or four cold taps for about 5 to 10 minutes at full pressure. If it does not clear, wait an hour and try again. If it still has not cleared in a few hours, or pressure drops noticeably, call NMB Water at 305-948-2960. Hold off on white laundry until the water runs clear. The annual free-chlorine period, when crews flush hydrants, is a common time for this.
Irrigation wells and outdoor stains
Water drawn from a shallow well for sprinklers has no treatment, so dissolved iron oxidizes when it hits air and sunlight and leaves orange streaks. Miami-Dade's year-round irrigation rules apply to wells too: two days a week, with odd-numbered addresses on Wednesday and Saturday and even-numbered on Thursday and Sunday, before 10 a.m. or after 4 p.m. Fewer watering days means fewer new stains, but iron filtration or a metered treatment on the irrigation line is what stops them. Existing stains need a rust remover, tested on a small spot first.
What Jorge tests
- Iron in hot and cold tap water.
- Iron and pH in irrigation water, if you have a well.
- Hardness and chloramine, which affect what treatment fits.
Call, text or WhatsApp (305) 793-5974. See also well water systems.
https://www.citynmb.com/912/Brown-or-Yellow-Hot-Water-On-First-Draw
https://www.citynmb.com/911/Brown-Red-Orange-or-Yellow-Water
https://www.citynmb.com/DocumentCenter/View/14691/2025-CCR-ENGLISH-web-version
https://www.miamidade.gov/global/water/conservation/outdoor-water-restrictions.page
Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist