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RO Membrane Selection for El Paso, TX Water

El Paso Water (EPWater) — Public Service Board
PWS ID: TX0710002
2025 water quality report

What's in El Paso's Water

Reported values from El Paso Water (EPWater) — Public Service Board's 2025 water quality data. Feed water chemistry drives membrane choice, operating pressure, and cleaning frequency.

Source water

One surface water source — the Rio Grande — and two groundwater sources, the Mesilla Bolson and Hueco Bolson aquifers; most customers receive a seasonal blend of two sources

Pfas note

All UCMR5 PFAS compounds below minimum reporting levels (<2.87-<4.79 ppt)

TTHM note

compliance is on the locational running annual average; 104 was a single sample

Arsenic0.0034 ppm
Arsenic (range)<0.001-0.0130 ppm
Barium0.09 ppm
Beta emitters3.1 pCi/L
Chlorine1.99 ppm
Chlorite0.009 ppm
Chromium0.0025 ppm
Copper 90th0.472 ppm
Fluoride0.58 ppm
Fluoride (range)0.03-1.08 ppm
Gross alpha1.5 pCi/L
HAA519.23 ppb
HAA5 (range)<1-33.1 ppb
Lead 90th0 ppb
Lithium58.3 ppb
Lithium (range)40-72.6 ppb
Nitrate0.74 ppm
Nitrate (range)<0.05-2.50 ppm
Selenium0.54 ppb
TTHM51.03 ppb
TTHM (range)<1-104 ppb
Uranium0.0015 ppm

Our Recommendation for El Paso

El Paso's defining trait is the swing: most customers get a blend of Rio Grande surface water and Mesilla/Hueco Bolson groundwater that shifts with the season, and the ranges show it — arsenic from under 1 to 13 ppb, fluoride 0.03 to 1.08 ppm, nitrate to 2.5, TTHM single samples reaching 104 ppb against a compliant 51 annual average. Lithium runs 40-72.6 ppb naturally in the groundwater, the highest we've recorded. Equipment doesn't care about annual averages — it sees today's water. A brackish NanoH2O (formerly LG) BW 400 R G2 flattens that variability into stable permeate year-round.

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 El Paso water?

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Data Source

Water quality values on this page are taken from El Paso Water (EPWater) — Public Service Board's 2025 published water quality report (PWS ID TX0710002). 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