South Houston 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
712.2 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 South Houston, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In South Houston | 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 South Houston compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ South Houston, Texas | ≈ 120–179 mg/L | 61 ppt | 🟠 Hard | reservoir |
| Pasadena, Texas | ≈ 180+ mg/L | 327.7 ppt | 🔴 Very Hard | reservoir |
| Galena Park, Texas | ≈ 120–179 mg/L | 179.5 ppt | 🟠 Hard | reservoir |
| Jacinto City, Texas | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Pearland, Texas | ≈ 180+ mg/L | 498.8 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How South Houston compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ South Houston | ≈ 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 South Houston's Water Unique?
Local geology and source profile
South Houston is served by Houston Water (Houston Public Works), the main municipal utility system (EPA ID TX1010013) serving approximately 2.4 million residents across the greater Houston area. The utility operates multiple water treatment plants drawing from surface water sources including the San Jacinto River system (Lake Conroe and Lake Houston reservoirs) and the Trinity River system (Lake Livingston reservoir), supplemented by 104 groundwater wells tapping the Evangeline and Chicot aquifers. The service area encompasses Harris County and surrounding regions.
The San Jacinto and Trinity River watersheds drain the Gulf Coast Plain, flowing through Quaternary and Tertiary alluvial deposits of sand, silt, and clay. Underlying these surface formations are Cretaceous and older sedimentary rocks containing abundant calcium and magnesium minerals. The groundwater component from the Evangeline and Chicot aquifers adds additional mineral content as water percolates through these mineral-rich formations, producing the hard water characteristic of the Texas Gulf Coast.
South Houston's water is classified as hard, with reported hardness levels in the Houston system ranging from approximately 110 to 300+ mg/L depending on location and seasonal variation. Residents can expect scale buildup on faucets, showerheads, and plumbing fixtures, along with reduced efficiency of soaps and detergents. A water softener is recommended to protect plumbing and extend appliance lifespan. The 2024 Consumer Confidence Report published by Houston Water documents compliance; treatment includes coagulation, sedimentation, filtration, and chlorination, with monitoring for lead, copper, and disinfection byproducts under the Safe Drinking Water Act.
Geology & Source: Gulf Coast Plain — Quaternary/Tertiary sand and clay over Cretaceous sediments; Evangeline and Chicot aquifers rich in calcium and magnesium produce hard water
Other Texas Water Reports
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Frequently Asked Questions
Is South Houston's water safe to drink?
Do I need a water softener in South Houston?
How does South Houston compare to the USA average?
Data Sources & Methodology
Water quality data for South Houston 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.