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RO Membrane Selection for Mission, TX Water

Sharyland Water Supply Corporation
PWS ID: TX1080033
2025 water quality report

What's in Mission's Water

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

Source water

Surface water from the Rio Grande River via United and Hidalgo County #1 irrigation canal systems (WTPs No.1 and No.3 in Alton, No.2 in McAllen)

Total Dissolved Solids

718 mg/L

Elevated TDS — above the EPA secondary standard of 500 mg/L; RO is the standard fix

Hardness

280 mg/L as CaCO3

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

Aluminum0.055 mg/L
Barium0.0876 ppm
Beta emitters6.7 pCi/L
Calcium69.8 ppm
Chloride159 mg/L
Combined uranium1.8 µg/L
Copper 90th0.12 ppm
Dibromochloromethane15.4 ppb
Gross alpha3.6 pCi/L
HAA519 ppb
Hardness (range)277-282 mg/L
Iron<0.010 ppm
Lead 90th1 ppb
Lithium36.23 ppb
Magnesium26.8 ppm
Manganese0.0048 mg/L
Nickel0.0022 ppm
Nitrate0.33 ppm
Pfba ppt7.05
Pfbs ppt0.75
Pfhpa ppt1.89
Pfhxa ppt6.01
Pfhxs ppt2.45
Pfoa ppt1.07
Pfos ppt2.93
Pfpea ppt6.33
PH7.2
Potassium8.47 ppm
Sodium129 ppm
Sulfate255 mg/L
TDS (range)701-737 mg/L
Total alkalinity84 mg/L
TTHM40 ppb
TTHM (range)25-40 ppb

Our Recommendation for Mission

Genuinely hard, brackish water: TDS ~718, hardness 280, sulfate 255 - scaling is the real risk - and the 2025 report now shows a detectable PFAS panel (PFOA 1.07, PFOS 2.93 ppt). A BW 400 R G2 (99.8% rated rejection) or higher-flow BW 440 R G2 with a properly dosed antiscalant is the build; RO is also one of the few technologies proven to knock down PFAS, and the energy-saving BW 400 ES L trims operating pressure where the feed allows.

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

Energy Optimized

NanoH2O (LG) BW 400 ES L

  • 99.6% salt rejection
  • 10,500 GPD · 150 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 Mission 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 Sharyland Water Supply Corporation's 2025 published water quality report (PWS ID TX1080033). 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