How does Tomball's water compare to the national average?

The USA national average is 151 mg/L. Tomball (≈ 120–179 mg/L) is 1 mg/L softer than average.

Tomball Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

groundwater

pH Level

7.6

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

234.5 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 Tomball, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Tomball	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 Tomball compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Tomball, Texas	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
The Woodlands, Texas	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Cypress, Texas	≈ 180+ mg/L	5.9 ppt	🔴 Very Hard	groundwater
Spring, Texas	≈ 120–179 mg/L	10.5 ppt	🟠 Hard	reservoir
Conroe, Texas	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir

National Benchmark

How Tomball compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Tomball	≈ 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 Tomball's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 234.5 mg/LpH: 7.6

Tomball, Texas, receives its water primarily from the Chicote Aquifer, a significant groundwater source for the region. While the HMW Special Utility District and Van Manor Mobile Home Park utility serve different areas, the Chicote Aquifer is the common origin for much of the drinking water. The HMW SUD operates treatment facilities, ensuring compliance with all federal drinking water standards for residents in Tomball and surrounding Harris County communities. Water treatment involves standard disinfection and rigorous monitoring for various contaminants.

The water's journey begins deep underground within the Chicote Aquifer, a geological formation rich in limestone and other mineral-bearing rocks characteristic of Southeast Texas. As water naturally filters through these ancient strata, it picks up dissolved minerals, notably calcium and magnesium. This interaction is the direct cause of the water's characteristic hardness, a common trait for groundwater supplies drawn from this particular geological setting.

Homeowners in Tomball will likely notice the effects of this hard water on their appliances and plumbing. Over time, mineral deposits, commonly known as scale, can build up inside water heaters, dishwashers, and washing machines, reducing their efficiency and lifespan. You might also find that soaps and detergents don't lather as well, and soap scum can accumulate on fixtures. Installing a water softener is often recommended to combat these issues and extend the life of your household equipment.

Geology & Source: Chicote Aquifer; limestone and mineral-rich formations yield hard water

Other Texas Water Reports

The Woodlands

≈ 120–179 mg/L

🟠 Hard

Cypress

≈ 180+ mg/L

🔴 Very Hard

Spring

≈ 120–179 mg/L

🟠 Hard

Conroe

≈ 120–179 mg/L

🟠 Hard

Report an Issue

Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Tomball's water safe to drink?

Yes. Tomball's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Tomball?

At ≈ 120–179 mg/L (Hard), Tomball's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Tomball compare to the USA average?

The USA national average is 151 mg/L. Tomball (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Tomball is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.