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Local Water DataCameron County
RO Membrane Selection for Harlingen, TX Water
Harlingen Waterworks System (HWWS)
PWS ID: TX0310002
2025 water quality report
What's in Harlingen's Water
Reported values from Harlingen Waterworks System (HWWS)'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 in Cameron County, delivered by canal to holding reservoirs at the Downtown and Runnion treatment plants
Arsenic3.9 ppb
Arsenic (range)3.2-3.9 ppb
Barium0.114 ppm
Beta emitters7.6 pCi/L
Chloramines3.7 ppm
Copper 90th0.0219 ppm
Fluoride0.57 ppm
HAA518.9 ppb
HAA5 (range)6.9-20.8 ppb
Lead 90th0 ppb
Nitrate0.53 ppm
Nitrite0.05 ppm
Selenium5.2 ppb
Thallium0.77 ppb
TTHM45.5 ppb
TTHM (range)19.5-50.8 ppb
Uranium3.2 µg/L
Our Recommendation for Harlingen
Harlingen's 2025 numbers are the familiar Rio Grande profile: TTHM at 45.5 ppb (samples past 50), arsenic 3.9, selenium 5.2 — all compliant, all exactly the constituents RO strips. For process and food-service water on HWWS supply, the brackish NanoH2O (formerly LG) BW 400 R G2 handles the mineral base and the DBP load in one pass.
Membranes Matched to This Water
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Data Source
Water quality values on this page are taken from Harlingen Waterworks System (HWWS)'s 2025 published water quality report (PWS ID TX0310002). 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