Why Does My Well Water Smell Like Rotten Eggs? (Brevard Guide)
Short answer
The rotten-egg smell is hydrogen sulfide gas, common in Florida wells. Smell only in hot water usually means the water heater; only in softened water means bacteria in the softener; a steady smell everywhere means sulfide in the groundwater, which needs aeration, air injection or carbon. A softener alone won't fix it. Test first.
If you turn on a tap in Palm Bay, Malabar, Mims or north Merritt Island and get a whiff of rotten eggs, you are not alone and your well is not necessarily "bad." The smell is almost always hydrogen sulfide, a gas that the Florida Department of Health says "can occur in wells anywhere in Florida." The good news: it's one of the most fixable well problems there is, as long as you find the real source before you buy anything.
Who on the Space Coast is on a private well?
More Brevard homes rely on wells than most people expect:
- Palm Bay: the city's own infrastructure plan says about 12,000 Palm Bay households are not connected to the city water system and rely on private wells. See our Palm Bay page.
- Malabar: the Town's comprehensive plan says only about 20% of residents are on public water, and that private wells "may require some treatment within the household to remove sulphur and salts." See Malabar & Grant-Valkaria.
- Mims, Grant-Valkaria, north Merritt Island and parts of west Cocoa: plenty of rural lots are on wells, but we found no official count, so check your own property records. See Mims and Merritt Island.
A useful clue: Brevard County's Mims water plant draws from the same shallow (surficial) aquifer many private wells use, and its annual report says the raw water is aerated to remove iron and dissolved gases before it goes to customers. City customers get that treatment at the plant. A private well owner gets the water exactly as it comes out of the ground.
Step 1: the four-faucet test (free, 10 minutes)
The Florida Department of Health's well-water handout gives a simple way to narrow down where the smell comes from. Smell the water from a hot tap and a cold tap, and if you have a softener, from a tap that bypasses it (often the outdoor hose bib).
| What you notice | Most likely source (per Florida DOH) | Usual fix |
|---|---|---|
| Smell only from hot water | A reaction inside the water heater | Have the water heater checked and flushed. A plumber can look at the anode rod, a common culprit. |
| Smell in hot and cold, but only in softened water | Sulfur bacteria growing in the water softener | Clean and sanitize the softener. Repair or replace if it keeps coming back. See softener repair. |
| Strong at first, then fades after running, or comes and goes | Sulfur bacteria in the well or plumbing | Well disinfection (shock chlorination) by a well contractor, then retest. |
| Strong and steady in hot and cold, even after running | Hydrogen sulfide in the groundwater itself | Whole-house treatment: aeration, oxidation (air injection) or activated carbon, sized to your test. |
This matters because the fixes are very different in price. A water-heater issue can be a modest service call. Gas in the groundwater needs equipment on the main line.
Is rotten-egg water dangerous?
According to the Florida Department of Health, sulfur bacteria are not harmful, and in most cases the smell "does not relate to how clean the water is." But the smell also tells you nothing about the things that can make you sick, such as coliform bacteria, E. coli or nitrate, which have no taste or smell at all.
That's why the Department of Health in Brevard County recommends testing a private well every year for bacteria and nitrate, and for lead every three years. Florida does not require routine testing of private home wells, so nobody tests yours unless you do. The state's well-owner handout puts a bacteria and nitrate test at roughly $20 to $70 if you collect the sample yourself, or about $50 to $100 if a professional collects it. DOH-Brevard publishes a list of sampling companies on its website (linked in the sources below).
Why a water softener alone won't fix the smell
This is one of the most common, and most expensive, well-water mistakes. A softener removes hardness (calcium and magnesium). It is not built to remove hydrogen sulfide, and heavy sulfur and iron can foul its resin. If the smell only appears in softened water, the softener may even be part of the problem.
The right order on a Brevard well is usually:
- Test the raw well water: hardness, iron, hydrogen sulfide, pH, total dissolved solids (salt), plus a lab bacteria and nitrate test.
- Remove sulfur and iron first with an air-injection (oxidizing) filter, aeration, or for heavy cases chlorine injection with filtration. See sulfur smell removal and iron and orange stain removal.
- Then soften, only if the test shows hardness worth treating. See water softener installation.
- Then treat drinking water with reverse osmosis if dissolved salts are high. See reverse osmosis.
The other Brevard well problems that travel with sulfur
Orange stains and slime (iron)
Red or orange stains in sinks, toilets, laundry, the driveway or the pool deck point to iron. A red, slimy growth in the toilet tank, or swampy or musty tastes, can mean iron bacteria. The Department of Health notes these bacteria aren't known to cause disease but can clog a well and reduce how much water it produces, and heavy growth may need the pump pulled and the well cleaned by a certified well contractor before chemical treatment.
Salty or brackish water
The deep Floridan aquifer under Brevard is brackish. The City of Melbourne runs its deep wells through reverse osmosis for exactly this reason, and Malabar's town plan mentions "salts" in private wells. A softener does nothing for salty water. If your test shows high dissolved solids or chloride, reverse osmosis is the tool, usually under the kitchen sink for drinking and cooking.
Tea-colored water
Shallow wells near swampy ground can pick up tannins, which tint water yellow or brown. It's usually cosmetic and is treated after iron removal. We found no Brevard-specific tannin data, so test before assuming that's the cause.
What does it cost to fix?
These are published ranges, not quotes. Your price depends on your test results, water use and plumbing:
| Item | Published range |
|---|---|
| Well bacteria + nitrate lab test | $20-$70 self-collected; $50-$100 professionally collected (Florida DOH) |
| Air-injection iron/sulfur filter | $1,500-$2,500 typical; $1,200-$3,600 range (Florida installer citing national cost guides) |
| Chlorine injection + filtration (heavy sulfur, iron or iron bacteria) | $3,000-$5,000+ |
| Full multi-stage well system | $4,500-$8,000+ |
If someone quotes you a big system before testing anything, ask to see the numbers. The state's own well-owner handout puts it plainly: "Don't buy water treatment equipment unless your test results indicate problems with your water."
After a hurricane or flood
Hurricane season runs June 1 to November 30. If floodwater covered your wellhead, the Department of Health advises not drinking the water until it has been tested, and disinfecting the well and retesting if bacteria show up. A sudden new smell or color after a storm is a reason to test, not just to filter.
Quick checklist for Brevard well owners
- Do the four-faucet test above and write down what you notice.
- Get a lab test for bacteria and nitrate every year, and lead every three years.
- Test iron, hydrogen sulfide, hardness, pH and dissolved solids before choosing equipment.
- Treat sulfur and iron first, soften second, and add RO only if salts are high.
- Retest after any treatment change, flood or new smell.
Smell sulfur in your Brevard well water?
Start with a free in-home water test. We check iron, sulfur, hardness and dissolved solids, then recommend only what your water needs. Call (321) 379-7015 or request a free quote online.