Match the stain to the source
| What you see | Likely source |
|---|---|
| Brownish water first thing in the morning or after a trip, clearing as the tap runs | Rust in in-unit pipes, a building riser or the water heater |
| Rust ring in toilets and sinks that keeps returning | Iron from plumbing or a heater, sometimes worsened by low use |
| Discolored water for a day or two across the area | Utility hydrant flushing during the annual free-chlorine period |
| Orange streaks on walls, walkways or pool decks | Irrigation water drawn from a well |
Inside the home or building
NMB Water's 2025 Water Quality Report says brown or yellow water, stained fixtures or laundry, and a metallic taste can be signs of rust or iron buildup in household plumbing, often from aging pipes or sediment. It recommends having a licensed plumber check for old galvanized pipes, and if none are present, flushing the water heater and household plumbing at least twice a year. The same report says NMB's 2025 service line inventory found no lead service lines in its system; your building's internal plumbing is the owner's or association's responsibility.
Seasonal residents often notice this most: water that sat in pipes and the heater for months comes out discolored at first.
Hydrant flushing
When NMB Water and WASD switch to free chlorine each year, crews flush hydrants to clean the mains. Fast-moving water can stir up sediment, and NMB has told customers they may notice temporary discoloration. Run the cold tap until it clears, and avoid doing white laundry until it does.
Landscape irrigation from wells
Where landscaping is watered from a well, iron in the groundwater can oxidize and leave orange streaks on stucco, pavers and pool decks. In Miami-Dade the county's year-round irrigation restrictions apply to private wells too: watering is limited to two days a week, before 10 a.m. or after 4 p.m. For homeowners and associations, iron filtration or a metered additive on the irrigation line can stop new stains. Treatment does not remove old stains; those need a rust cleaner tested on a small area first.
What Jorge tests
- Iron at the tap, hot and cold.
- Iron in irrigation water, if relevant.
- pH and hardness, which affect the treatment choice.
If the source is plumbing, he will tell you that a plumber, not a filter, is the right fix. For persistent iron, see the well water system or a filtration stage sized to the result.
Book
Call, text or WhatsApp (305) 793-5974 for a free in-home test.
https://www.citynmb.com/DocumentCenter/View/14691/2025-CCR-ENGLISH-web-version
https://www.citynmb.com/DocumentCenter/View/8844/Drops-of-Knowledge-January-2022
https://www.miamidade.gov/global/water/conservation/outdoor-water-restrictions.page
Updated 2026-10-17 · Living Waters · Jorge Canela, Water Quality Specialist