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RO Membrane Selection for San Juan, TX Water
City of San Juan
PWS ID: TX1080010
2025 water quality report
What's in San Juan's Water
Reported values from City of San Juan's 2025 water quality data. Feed water chemistry drives membrane choice, operating pressure, and cleaning frequency.
Source water
Rio Grande surface water at Plants #1 and #2, blended with groundwater from a Gulf Coast Aquifer well at Plant #1
Barium0.104 ppm
Beta emitters7.9 pCi/L
Chloramines2.08 ppm
Combined radium1.5 pCi/L
Copper 90th0.0585 ppm
Dibromochloromethane18.9 ppb
Fluoride0.44 ppm
Gross alpha3.6 pCi/L
HAA519 ppb
Lead 90th0 ppb
Nickel0.003 ppm
Nitrate0.12 ppm
Selenium3.8 ppb
Toc5.76 ppm
TTHM50 ppb
TTHM (range)44-50 ppb
Uranium4.7 µg/L
Our Recommendation for San Juan
San Juan's profile is classic mid-Valley Rio Grande feed: TTHM at a 50 ppb locational average, plus uranium at 4.7 ug/L and gross beta near 8 pCi/L. Nothing violates, but everything an RO membrane is built for is present. The brackish NanoH2O (formerly LG) BW 400 R G2 is the straightforward spec for this water.
Membranes Matched to This Water
Running RO on San Juan water?
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Data Source
Water quality values on this page are taken from City of San Juan's 2025 published water quality report (PWS ID TX1080010). 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