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RO Membrane Selection for Las Vegas, NV Water

Las Vegas Valley Water District
PWS ID: LVVWD (PWS ID not printed in report)
2025 water quality report

What's in Las Vegas's Water

Reported values from Las Vegas Valley Water District's 2025 water quality data. Feed water chemistry drives membrane choice, operating pressure, and cleaning frequency.

Source water

About 90% Colorado River water drawn from Lake Mead (ozonation, filtration, chlorination at two SNWA plants); ~10% deep Las Vegas Valley aquifer groundwater used mainly April-October

Copper note

one tap sample exceeded the 1.3 action level; 90th percentile compliant

Hardness note

280 ppm / 16 grains per gallon — the utility's own softener-setting guidance

Pfas note

PFOA, PFOS, PFBS, PFHxS, PFNA, GenX all not detected; Hazard Index ND

TTHM note

highest locational running annual average 72 vs the 80 MCL; individual samples to 83 allowed when the LRAA complies

Hardness

280 mg/L as CaCO3

Very hard — high scaling risk — expect antiscalant dosing, conservative recovery, and a regular cleaning schedule

Arsenic (range)0.60-4.0 ppb
Barium0.1 ppm
Bromate4.2 ppb
Chlorine0.99 ppm
Combined radium (range)ND-3.7 pCi/L
Copper 90th0.82 ppm
Fluoride (range)0.29-0.76 ppm
Gross alpha (range)ND-7.4 pCi/L
HAA544 ppb
HAA5 (range)ND-53 ppb
Lead 90th2.1 ppb
Lithium34 ppb
Lithium (range)9.3-43 ppb
Nitrate (range)0.41-5.3 ppm
Pfhxa0.0049 ppb
Pfpea0.0044 ppb
Selenium (range)ND-3.0 ppb
TTHM72 ppb
TTHM (range)1.4-83 ppb
Uranium (range)1.6-4.1 ppb

Our Recommendation for Las Vegas

Las Vegas water is defined by one number the utility itself puts on the report's back page: hardness 280 mg/L — 16 grains per gallon — straight from the mineral-rich Colorado River via Lake Mead. Disinfection byproducts run close to the line too: the worst-location TTHM annual average hit 72 against the 80 limit. For espresso machines, boilers, and process water on this feed, a brackish NanoH2O (formerly LG) BW 400 R G2 with antiscalant handles the scaling load RO was built for.

Membranes Matched to This Water

The Industry Workhorse

NanoH2O (LG) BW 400 R G2

  • 99.8% salt rejection
  • 11,500 GPD · 225 psi
  • 400 ft² active area
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Running RO on Las Vegas water?

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Data Source

Water quality values on this page are taken from Las Vegas Valley Water District's 2025 published water quality report (PWS ID LVVWD (PWS ID not printed in report)). Values are utility-wide averages; water at a specific site can vary. For membrane selection on a critical system, test your actual feed water.

View the official report