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RO Membrane Selection for Alamo, TX Water

City of Alamo
PWS ID: TX1080001
2025 water quality report

What's in Alamo's Water

Reported values from City of Alamo's 2025 water quality data. Feed water chemistry drives membrane choice, operating pressure, and cleaning frequency.

Total Dissolved Solids

1100 mg/L

Brackish-range TDS — well above the EPA secondary standard of 500 mg/L; brackish water membranes are designed for exactly this feed

Hardness

396 mg/L as CaCO3

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

Arsenic3 ppb
Barium0.115 ppm
Beta emitters6.6 pCi/L
Bicarbonate161 ppm
Chloramines2.16 ppm
Chloramines max4.8 ppm
Chloride278 ppm
Chlorite0.38 ppm
Copper 90th0.052 ppm
Dibromochloromethane8.7 ppb
Fluoride0.62 ppm
Gross alpha5.2 pCi/L
HAA513 ppb
Lead 90th1 ppb
Lithium48.3 ppb
Nitrate0.38 ppm
Pfba ppt5.45
Pfhxa ppt3.5
Pfpea ppt3.35
PH7.8
Selenium4.6 ppb
Sodium240 ppm
Sulfate311 ppm
Toc6.32 ppm
Total alkalinity132 ppm
TTHM23 ppb
TTHM (range)8.1-12.3 ppb
Turbidity ntu0.34
Uranium5.4 µg/L

Our Recommendation for Alamo

Alamo publishes the numbers most Valley utilities leave out, and they are heavy: TDS 1100 mg/L (over the 1000 secondary standard), hardness 396, sulfate 311 (over 300), chloride 278, sodium 240. This is genuinely brackish feed with serious scaling potential — the NanoH2O (formerly LG) BW 400 R G2 (or the higher-flow BW 440 R G2) with proper antiscalant dosing and conservative recovery is exactly the build, the same story as neighboring Mercedes. The 2025 report keeps the regulated side clean (arsenic 3 ppb, selenium down to 4.6), so the case here is scaling and salinity, not health exceedances.

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

Maximum Active Area

NanoH2O (LG) BW 440 R G2

  • 99.8% salt rejection
  • 12,650 GPD · 225 psi
  • 440 ft² active area
View membrane

Running RO on Alamo water?

Send us your system size and feed water details — we'll spec the right membrane for your operation and quote same-day shipping.

Data Source

Water quality values on this page are taken from City of Alamo's 2025 published water quality report (PWS ID TX1080001). 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