New Orleans draws its drinking water from the Mississippi River and treats it at plants on both banks. The treatment adds chloramine, a disinfectant that holds up over miles of pipe. Measured against the standards the utility answers to, the water leaving those plants does its job. The real question is what happens between the plant and your glass. In many neighborhoods, that trip runs through service lines laid long before anyone worried about lead.
That gap is where most of the confusion sits. Homeowners hear that the water is safe. Then they hear about lead studies. Then they buy a pitcher filter and consider the matter settled. A handful of beliefs keep circulating around kitchens across the city. Each holds a grain of truth, which is exactly why they stick around.
For homeowners who want the filtration side handled by someone local, G Fox Plumbing installs and maintains drinking water systems across New Orleans, including under-sink reverse osmosis units. The same team repairs and replaces the water heaters that hold a home’s hot supply. They have worked in the area for more than eight years and offer free estimates. That makes it easy to have a system matched to your actual water before you spend money on one. A call before you buy a filter usually costs less than a call after it stops doing its job.
Lead Free Leaving the Plant Means Lead Free at the Tap
The belief. The Sewerage and Water Board says its treated water leaves the plants with no detectable lead. That statement is accurate. The utility also adds lime to make the water less corrosive to old pipe.
What actually happens. Lead gets picked up along the way. Older parts of the city were often served by lead service lines, and older homes may still have lead solder and brass fixtures. The utility has estimated that 50 to 60 percent of its roughly 150,000 metered service lines will need at least partial replacement. In 2024, the Water Collaborative of Greater New Orleans tested 144 homes across 37 neighborhoods and found detectable lead in 88 percent of them. A renovated interior does not settle the question. A house replumbed after Katrina can still sit on a lead line on the city’s side of the meter.
The useful move. Look up your address on the utility’s service line inventory and get your water tested. Take extra care after street work nearby, since digging and partial line replacements can knock lead particles loose. Running cold water for 30 seconds to two minutes after it sits overnight helps. It is not a substitute for a proper filter if your line turns out to be lead.
Boiling Takes Care of Whatever Is in the Water
The belief. New Orleans residents know boil water advisories well. Boiling starts to feel like the fix for everything.
What actually happens. Boiling kills bacteria and parasites, which is exactly what an advisory targets after a pressure drop. It does nothing for metals. As water evaporates, any lead left in the pot becomes more concentrated. The EPA’s guidance on lead in drinking water tells households to use cold water for drinking, cooking and baby formula, and warns that boiling does not remove lead. Hot water also pulls more lead from pipes and fittings than cold water does. A tank water heater stores that water for hours, so filling a cooking pot from the hot side is a habit worth dropping.
The useful move. Treat boiling and filtering as separate tools for separate problems. After an advisory lifts, flush your faucets, toss the ice from the maker, and replace any filter cartridges that took in untreated water during the advisory.
Any Carbon Filter Handles City Water
The belief. A pitcher or faucet filter that makes water taste better must be making it safer too.
What actually happens. Taste and safety are certified separately. NSF/ANSI 42 covers aesthetic issues like chlorine taste and odor. Lead reduction falls under NSF/ANSI 53, or NSF/ANSI 58 for reverse osmosis systems. The NSF lead reduction listings advise buyers to confirm that lead is named on the packaging, not just implied by a standard number. Certified units now have to bring lead down to 5 parts per billion from test water spiked far higher than anything a typical tap would see.
Chloramine adds another wrinkle. It is more stable than chlorine, which is why utilities use it, but ordinary carbon removes it slowly. Catalytic carbon is the media built for it. A filter that handles chlorine taste nicely may leave chloramine’s flavor behind.
The useful move. Match the certification to the problem you are solving. Check the rated capacity in gallons and change cartridges on schedule. A cartridge past its capacity is no longer covered by its lead claim, and cartridges are not interchangeable across brands.
Reverse Osmosis Runs Itself Once It Is Installed
The belief. An under-sink reverse osmosis system sits at the top of the filtration ladder. Once it is in, the water question is finished.
What actually happens. RO is a set of parts with different lifespans. Carbon prefilters sit ahead of the membrane partly to protect it, because common thin film membranes break down when exposed to chlorine or chloramine. When a prefilter runs overdue, the membrane takes the damage, and water quality slips without much warning. The membrane also strips out minerals along with contaminants. That changes the taste and is why some homeowners add a remineralizing stage. Most units send a share of water down the drain to keep the membrane flushed, and the storage tank needs periodic sanitizing.
The useful move. Keep a written schedule for the prefilters, membrane and post filter. An inexpensive total dissolved solids meter, used now and then at the RO faucet, shows when the membrane is losing ground. If testing confirms lead at your tap, an NSF/ANSI 58 system that lists lead is a strong answer for drinking and cooking water. Showers, laundry and the hot side of the house still run on whatever line you have, though, so the RO unit is one piece of the plan rather than the whole plan.
Where the Responsibility Shifts
The four myths share a common thread. Treatment at the plant ends at the meter, and everything past it belongs to the house. Knowing what your service line is made of, what your filter is certified to reduce, and when each part of your system expires turns a vague worry into a short maintenance list. That list is far easier to keep up with than a guess.
Leave a Comment