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RO Membrane Selection for Tucson, AZ Water

Tucson Water (City of Tucson) — Main System
PWS ID: AZ0410112
2024 water quality report

What's in Tucson's Water

Reported values from Tucson Water (City of Tucson) — Main System's 2024 water quality data. Feed water chemistry drives membrane choice, operating pressure, and cleaning frequency.

Source water

78% Colorado River water recharged into the aquifer and recovered through wells (CAVSARP, SAVSARP, Pima Mine Road facilities); 22% native groundwater from the Central Well Field

Pfas note

No PFAS detected in any active well — Tucson Water voluntarily removes wells from service at ANY detectable PFOA/PFOS

Arsenic6.64 ppb
Arsenic (range)ND-6.64 ppb
Atrazine0.11 ppb
Barium0.09 ppm
Chlorine1 ppm
Combined radium2.5 pCi/L
Copper 90th0.135 ppm
Fluoride0.59 ppm
Gross alpha3.9 pCi/L
HAA52.2 ppb
Lead 90th0.65 ppb
Lithium15.9 ppb
Lithium (range)ND-63.7 ppb
Nitrate7.2 ppm
Nitrate (range)ND-7.2 ppm
Sodium40.8 ppm
Sodium (range)24.5-40.8 ppm
Trichloroethylene1.16 ppb
TTHM26.3 ppb
TTHM (range)3.1-39.3 ppb
Uranium15 ppb
Uranium (range)ND-15 ppb

Our Recommendation for Tucson

Tucson's desert groundwater blend carries the constituents RO earns its keep on: arsenic to 6.64 ppb, nitrate samples reaching 7.2 against a 10 limit, uranium to 15 ppb (half the MCL), and a trichloroethylene detection at 1.16 ppb — the legacy of the city's industrial-contamination history that also drives its aggressive PFAS well-shutdown policy. A brackish NanoH2O (formerly LG) BW 400 R G2 rejects the arsenic, nitrate, uranium and TDS load together; the variability between recharged river water and native groundwater is exactly what point-of-use RO flattens.

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 Tucson water?

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Data Source

Water quality values on this page are taken from Tucson Water (City of Tucson) — Main System's 2024 published water quality report (PWS ID AZ0410112). 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