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RO Membrane Selection for North Alamo WSC (Eastern RGV), TX Water

North Alamo Water Supply Corporation
PWS ID: TX1080029
2025 water quality report

What's in North Alamo WSC (Eastern RGV)'s Water

Reported values from North Alamo Water Supply Corporation's 2025 water quality data. Feed water chemistry drives membrane choice, operating pressure, and cleaning frequency.

Source water

Six Rio Grande-fed surface intakes (Edinburg East Reservoir, Santa Cruz Canal, Lopezville, Donna North, Monte Alto, Delta) plus six groundwater wells, feeding seven surface water treatment plants across eastern Hidalgo, Willacy and northwest Cameron counties

TTHM note

highest locational running annual average (Lyford site); other sites 23-66

Antimony1.1 ppb
Arsenic2.3 ppb
Barium0.133 ppm
Beta emitters7.5 pCi/L
Chloramines3.17 ppm
Copper 90th0.146 ppm
Dibromochloromethane33.7 µg/L
Fluoride0.47 ppm
Gross alpha3.2 pCi/L
HAA537 ppb
Lead (range)0-266 ppb
Lead 90th0 ppb
Nickel0.0027 ppm
Nitrate0.12 ppm
Selenium4.4 ppb
TTHM84 ppb
Uranium2.2 µg/L

Our Recommendation for North Alamo WSC (Eastern RGV)

North Alamo WSC carried active TTHM MCL violations through the second half of 2025 — the Lyford site's running annual average hit 84 ppb against the 80 ppb federal limit. Trihalomethanes are exactly what RO plus carbon polishing removes; for homes and businesses on NAWSC water, a brackish NanoH2O (formerly LG) BW 400 R G2 addresses the DBPs and the Rio Grande mineral base together. Household plumbing lead also ran 0-266 ppb at sampled taps (two sites over the action level) — RO at point of use is the last line of defense there too.

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
View membrane

Running RO on North Alamo WSC (Eastern RGV) water?

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Data Source

Water quality values on this page are taken from North Alamo Water Supply Corporation's 2025 published water quality report (PWS ID TX1080029). 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