What reverse osmosis takes out of Las Vegas tap water

Does reverse osmosis remove microplastics?

It can, if the model is certified for it. NSF, the independent body that tests home water treatment products, checks microplastics reduction under a separate standard, NSF/ANSI 401 (the one for “emerging” contaminants), and its October 2026 listings for that claim include models described as reverse osmosis systems that are also certified to the reverse osmosis standard. Not every unit carries the claim, so look for “microplastics reduction” in the model’s listing.

In Las Vegas there is very little to catch. The Southern Nevada Water Authority says the measurable microplastics in Lake Mead are “extremely low”, between 0.0004 and 0.01 particles per liter, so you would have to drink 100 to 2,500 liters of untreated lake water to take in a single particle. Its treatment plants use filtration that can remove particles smaller than a micrometer. The authority’s own tip for keeping them out of the watershed is to cut back on household sources such as microbeads, plastic chopping boards and laundry or dishwasher pods.

Does reverse osmosis remove fluoride from Las Vegas water?

Yes, a unit certified for it does. On NSF’s search of certified products, “fluoride reduction” appears among the claims for reverse osmosis systems (NSF/ANSI 58), and not among the claims for ordinary carbon filters. The Las Vegas Valley Water District is blunt about the carbon kind: carafe-style activated carbon filters help with chlorine taste but don’t take out fluoride.

How much is there to remove? The water authority adds about 0.4 mg/L to the 0.3 that occurs naturally, bringing valley water to roughly 0.7, as Nevada law requires. In 2025 the district’s taps averaged 0.65 ppm, against a federal limit of 4.0. Its well water, which the fluoridation rule doesn’t cover, had 0.12 to 0.50 ppm.

If fluoride is your reason for buying, the district’s advice is to ask the company that sold the product, or call NSF, whether that model reduces it. Pitcher and faucet filters only count if their listing shows a fluoride claim. The history and the dose are on our page about Las Vegas water quality.

Do you need a PFAS filter on Las Vegas water?

Not on the district’s 2025 results. It tested for 29 PFAS (the long-lasting “forever chemicals”) under the EPA’s national monitoring round, and the six that the EPA now regulates were not detected: PFOA, PFOS, PFNA, PFHxS, PFBS and GenX. Two unregulated ones turned up where water enters the pipe network:

• PFHxA at 0.0041 to 0.0056 ppb, average 0.0049
• PFPeA at 0.0040 to 0.0048 ppb, average 0.0044

That is about 4 to 6 parts per trillion (our conversion). For scale, the EPA’s limits for PFOA and PFOS, which were not found here, are 4 parts per trillion each. The district’s question-and-answer page adds that, according to the EPA, more than 80 percent of PFAS exposure comes from consumer goods rather than drinking water.

If you want a filter anyway, the EPA’s page on home PFAS filters covers units at a single tap, not whole-house systems. It found that point-of-use carbon, ion exchange resin and reverse osmosis units “can greatly reduce PFAS levels”, put a reverse osmosis unit at $150 to $1,000 before upkeep, and warned that the certification standards (as of April 2024) don’t yet show a filter brings PFAS down to the EPA’s new limits. Look for NSF/ANSI 53 or 58 with a PFAS claim, then check the listing names the PFAS you want gone. On NSF’s search, the PFOA, PFOS and “total PFAS” claims sit under NSF/ANSI 53, the health standard for filters; an RO unit can hold both, because the EPA notes that some systems combine several technologies and are certified to more than one standard.

Can you filter lead out of Las Vegas tap water?

Yes. Filters certified for lead under NSF/ANSI 53 (the U.S. standard for filters that reduce health-related contaminants) and reverse osmosis units certified for lead under NSF/ANSI 58 both reduce it. Whirlpool’s published test data for one under-sink RO model is an example: a lead challenge averaging 0.16 mg/L came out at 0.001 mg/L on average, a 99.1 percent cut.

In the valley, lead comes from inside the house, not from the district. The district says its system has no lead service lines or lead-based parts, and that lead and copper in tap water come mainly from corroding home plumbing. Of 55 home taps it sampled from June to September 2025, nine in ten had 2.1 ppb of lead or less, against an action level of 15; the highest sample was 11. It adds that some Nevada homes built before 1990 are more likely to have lead pipes, fixtures and solder.

Before buying anything, the district’s own steps cost nothing: after water has sat for several hours, run the tap for 30 seconds to 2 minutes before drinking or cooking with it, and if you are concerned, have it tested by a private laboratory. Whether the other valley utilities’ water passes is on our page asking is Las Vegas tap water safe to drink?

How to check a filter is certified for lead

Look for three things, in this order, using the EPA’s consumer guide to lead filters:

1. A certifier’s mark on the box, the filter or the smallest package it comes in. NSF, the Water Quality Association, IAPMO, UL and CSA are the bodies the EPA lists.
2. The standard and the claim next to the mark: text saying the unit was tested and certified against NSF/ANSI 53 (for a reverse osmosis unit, 58), with lead reduction listed. The EPA suggests also looking for NSF/ANSI 42 Class I particulate reduction, and for lead reduced to 5 ppb or less.
3. The performance data sheet, inside the packaging or on the maker’s site, which lists each claim with the test result. You can also search the certifier’s own listing by brand or model.

A filter only does this while it is maintained. The EPA notes that filters work only when changed on the maker’s schedule; our guide to reverse osmosis upkeep in Las Vegas has the schedules from two makers’ manuals.

What NSF/ANSI 58 certification means on a reverse osmosis unit

NSF/ANSI 58 is the U.S. standard an independent lab tests home reverse osmosis systems against. A model that carries it has had each listed claim checked: the lab feeds it water spiked with a set amount of a substance and measures what comes out. Whirlpool’s manual, for example, describes testing with water spiked to a set level and reports the result for each claim on its performance data sheet.

What the mark doesn’t mean is “removes everything”. NSF’s listing for the standard shows each model with its own claims, from TDS (total dissolved solids) reduction to lead, fluoride, nitrate and arsenic, and its daily production rate. The EPA’s WaterSense guide says the same thing in its own words: reverse osmosis doesn’t remove all inorganic and organic contaminants, so match the claims to what you want gone. NSF’s listings are free to search at its website.

Sodium, dissolved solids and perchlorate in valley water

A membrane takes out more than the headline chemicals, and the district publishes these three:

• Dissolved solids: 591 ppm on average, under Nevada’s taste-and-look guideline of 1,000. The two RO manuals we read accept feed water up to 2,000 ppm.
• Sodium: 89 ppm before any softener; a salt-based softener adds more. The EPA’s WaterSense guide lists sodium among what reverse osmosis removes. Our page on softened water and sodium in Las Vegas has the figures by area.
• Perchlorate: 0.70 ppb on average. It is a salt used in rocket propellant and fireworks that reached Lake Mead from two industrial complexes in the southeast valley where it used to be made. The district’s question-and-answer page says reverse osmosis units are generally effective at reducing it to below detection limits, and suggests anyone worried about its health effects talk to their doctor.

Nitrate averaged 0.56 ppm against a limit of 10; “nitrate/nitrite reduction” is another claim some RO units carry. For how RO fits alongside a softener, see reverse osmosis in Las Vegas.

How to filter tap water in Las Vegas, from pitcher to membrane

Start with the problem. The district’s tips for chlorine taste are a pitcher of tap water in the fridge, a slice of citrus, or an inexpensive activated carbon filter. Carbon stops there: it doesn’t touch hardness, minerals or sodium.

For those, the Southern Nevada Water Authority describes reverse osmosis as the only filter type that removes calcium and magnesium. It lists the costs too: more expensive, may need a plumber, takes up storage space, and many units waste water. Its own stance is that it recommends no brand or model.

• Taste of chlorine only: pitcher, faucet or under-sink carbon filter.
• Fewer minerals, less sodium, a fluoride or lead claim: an under-sink reverse osmosis unit with those claims on its listing.
• Scale throughout the house: neither; that is a softener’s job. Our Las Vegas water filtration options guide sets the systems side by side.

Sources for this page

• Las Vegas Valley Water District · annual water quality report (published 2026, 2025 data) · PFAS monitoring results and the six not detected; fluoride at the tap and in wells; lead sampling, lead-free system, homes built before 1990, flushing and private testing.
• Las Vegas Valley Water District · water quality summary for the valley (published 2026, 2025 data) · dissolved solids, sodium, perchlorate, nitrate, Nevada guideline for dissolved solids.
• Las Vegas Valley Water District · water quality questions-and-answers page (checked 27 October 2026) · fluoride dose and law, asking NSF about fluoride, carbon filters, chlorine tips, PFAS limits and exposure, microplastics in Lake Mead, perchlorate and reverse osmosis.
• Southern Nevada Water Authority · home treatment systems page (checked 27 October 2026) · reverse osmosis is the only filter type that removes calcium and magnesium; its drawbacks; no brand recommended.
• Southern Nevada Water Authority · water quality questions-and-answers page (checked 27 October 2026) · microplastics in Lake Mead and particle filtration at the treatment plants.
• NSF · certified drinking water treatment product search and listings (current 27 October 2026) · claims under NSF/ANSI 58, 53 and 401, including fluoride, PFAS and microplastics reduction.
• U.S. EPA · page on drinking water filters certified to reduce PFAS (checked 27 October 2026) · types of filter, RO price range, certification caveat, what to look for.
• U.S. EPA · consumer tool for identifying filters certified to reduce lead (June 2024) · certifiers, marks, standards text, 5 ppb, performance data sheet.
• U.S. EPA WaterSense · guide to selecting water treatment systems (2025) · reverse osmosis removes sodium; doesn’t remove everything; systems certified to several standards.
• Whirlpool Water Solutions · installation and operation manual for an under-sink RO model · lead test result; how claims are tested; feed water limits; carbon stages.
• APEC Water Systems · installation and owner’s manual for an under-sink RO model (2015) · feed water up to 2,000 ppm dissolved solids; carbon pre-filters protect the membrane.