Weslaco Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
8.5
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
636.2 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Weslaco, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Weslaco | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Weslaco compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Weslaco, Texas | ≈ 120–179 mg/L | 82.4 ppt | 🟠 Hard | reservoir |
| Donna, Texas | ≈ 180+ mg/L | 74.7 ppt | 🔴 Very Hard | reservoir |
| Mercedes, Texas | ≈ 120–179 mg/L | 3.3 ppt | 🟠 Hard | reservoir |
| Alamo, Texas | ≈ 180+ mg/L | 36.5 ppt | 🔴 Very Hard | reservoir |
| San Juan, Texas | ≈ 120–179 mg/L | 154.4 ppt | 🟠 Hard | reservoir |
National Benchmark
How Weslaco compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Weslaco | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Weslaco's Water Unique?
Local geology and source profile
The City of Weslaco Water Company is a municipal utility serving approximately 32,635 residents across Weslaco and surrounding areas in Hidalgo County, Texas. The utility sources its drinking water from surface water, primarily the Rio Grande, and operates conventional filtration and disinfection treatment at its facilities located at 255 S. Kansas Avenue, Weslaco, TX 78596. The utility can be reached at 956-968-3181. Treatment employs conventional filtration methods to address sediment and contaminants before distribution to residents in the Rio Grande Valley service area.
The Weslaco water supply originates from the Rio Grande, which flows through the Rio Grande Valley in South Texas. The watershed is characterized by Quaternary alluvial deposits overlying Tertiary sediments. The underlying geology includes Cretaceous and Paleocene formations containing significant concentrations of calcium and magnesium minerals. This geological setting, combined with the semi-arid climate and agricultural activity in the region, results in a hard water supply typical of South Texas surface sources.
At the hard water level, Weslaco residents can expect scale buildup in pipes, water heaters, and appliances such as dishwashers and washing machines. Soap and detergent effectiveness is reduced, and mineral deposits accumulate on fixtures and shower doors. Water heaters and boilers require more frequent maintenance and descaling. A water softener is recommended for households seeking to reduce these effects and extend appliance lifespan. Per TapWaterData (2026), the utility reported 5 contaminants above EPA MCLGs from over 223 tested, including arsenic, total trihalomethanes, and disinfection byproducts such as bromodichloromethane, chloroform, and dichloroacetic acid; conventional filtration and disinfection are employed to meet federal and state safety standards.
Geology & Source: Rio Grande Valley, South Texas; Quaternary alluvial deposits over Tertiary sediments — Cretaceous and Paleocene formations rich in calcium and magnesium yield hard surface water
Other Texas Water Reports
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Frequently Asked Questions
Is Weslaco's water safe to drink?
Do I need a water softener in Weslaco?
How does Weslaco compare to the USA average?
Data Sources & Methodology
Water quality data for Weslaco is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.