How Hard Is Fort Bend Water? It Depends on Your Water System, Not Your ZIP
State sample results for eight systems, and why ZIP-code charts mislead
Fort Bend County Water Hardness by Water System
Why There Is No Single Number for Fort Bend
Search for "water hardness by ZIP code" and you'll find charts that give a whole city, or a whole ZIP code, one number. In Fort Bend County that number can't be right, because hardness belongs to a water system, not to a ZIP code.
Our dataset covers 186 public water systems that serve Fort Bend County: cities, municipal utility districts (MUDs), water districts and small private systems. Each one draws from its own wells, buys water from a neighbor, treats surface water, or blends several of these. A single ZIP code can include several systems, and the subdivision across the road can be on a different supply. Not sure what a MUD is? Read What Is a MUD?
What Eight Fort Bend Systems Reported
The Texas Commission on Environmental Quality (TCEQ) samples public water systems and publishes the results on its Drinking Water Watch site. These are the total hardness ranges from those state samples for eight systems across the county, in grains per gallon (gpg). One grain per gallon is 17.1 milligrams per liter.
| Water system | Area | State samples | Hardness (gpg) |
|---|---|---|---|
| City of Sugar Land, main system | Sugar Land | 6, Jan 2025 to Apr 2026 | 6.1 to 11.8 |
| Fort Bend County MUD 23 | Missouri City area | 2, Apr 2024 to Feb 2026 | 1.7 to 4.4 |
| Quail Valley Utility District | Missouri City area | 3, Mar 2026 | 7.8 to 11.6 |
| Fort Bend County WCID 2 | Stafford area | 8, Jan 2024 to Mar 2026 | 2.3 to 10.3 |
| City of Richmond | Richmond area | 8, Jan 2024 to Jun 2026 | 7.3 to 13.5 |
| Pecan Grove MUD | Richmond area | 6, Jan 2024 to Feb 2026 | 3.6 to 7.7 |
| City of Fulshear | Fulshear | 90, Feb 2024 to Sep 2026 | 3.2 to 9.5 |
| Cinco MUD 1 | Katy / Cinco Ranch area | 20, Dec 2023 to May 2026 | 6.4 to 9.6 |
Source: TCEQ Drinking Water Watch, total hardness as calcium carbonate, accessed November 5, 2026. These ranges describe the samples the state took on those dates, not the water at any one home.
Neighbors, Different Water
Look at the pairs. Fort Bend County MUD 23 and Quail Valley Utility District both serve the Missouri City area. MUD 23's samples ran from soft to moderately hard, 1.7 to 4.4 gpg. Quail Valley's ran from hard to very hard, 7.8 to 11.6 gpg. Around Richmond, the City of Richmond's samples ran from 7.3 to 13.5 gpg, while Pecan Grove MUD's ran from 3.6 to 7.7.
A chart that averages those together describes nobody's water. A household on MUD 23's water and a household on Quail Valley's water could reasonably make different decisions about a softener.
Why One System Can Show a Wide Range
Even one system isn't one number. Many have several wells and entry points, and some blend groundwater with treated surface water. The City of Sugar Land's main system blends treated surface water from Oyster Creek and the Brazos River with water from its wells.
The city's own water quality page gives the main system a range of 2.0 to 16.4 gpg, explains that hardness can vary from well to well, and recommends reading it as a range for the whole system. It lists separate ranges for Greatwood (2.0 to 9.6 gpg), New Territory (2.9 to 10.9) and River Park (6.4 to 9.1). The state samples in the table above cover a shorter window of dates, which is why the numbers differ. Whenever you see a hardness figure, ask which system it describes, which source it comes from, and which dates it covers.
What the Numbers Mean at Home
The U.S. Geological Survey classifies hardness like this:
- Soft: 0 to 3.5 gpg (0 to 60 mg/L)
- Moderately hard: 3.5 to 7 gpg (61 to 120 mg/L)
- Hard: 7 to 10.5 gpg (121 to 180 mg/L)
- Very hard: above 10.5 gpg (above 180 mg/L)
Hardness is mostly dissolved calcium and magnesium. It is not a health standard, which is why many annual water quality reports leave it out. Above about 7 gpg it shows up as white crust on faucets, film on shower glass, spots on dishes, soap that won't lather and scale inside water heaters. Learn more on our hard water page.
How to Find Your Own Number
- Find your water system. The name is on your water bill.
- Look it up. Our hard water by water system page lists state sample ranges, with dates, for the systems we've checked. You can also search your system on TCEQ's Drinking Water Watch.
- Test if there's no recent sample. A test at your tap tells you what reaches your home today.
That number is what a water softener is sized from, together with your household size and peak water use. If you'd like us to look up your system, call 281-979-3405.
Water Hardness FAQs
How many grains per gallon is hard water?
On the U.S. Geological Survey's scale, 7 to 10.5 grains per gallon is hard and anything above 10.5 is very hard. From 3.5 to 7 is moderately hard, and below 3.5 is soft.
Why is my water harder than my friend's across town?
You are probably on different water systems. Fort Bend County has cities, MUDs and private systems side by side, and they draw from different wells and surface water supplies.
Does my annual water quality report list hardness?
Often not, because hardness is not a regulated drinking-water contaminant. State sample results on TCEQ's Drinking Water Watch, and some systems' own websites, publish it instead.
How do I convert milligrams per liter to grains per gallon?
Divide by 17.1. For example, 171 mg/L as calcium carbonate is 10 grains per gallon.
Find Out What Your Water System Reports
Send us your ZIP code and what you're noticing. We'll find the water system that serves your address, read its hardness figures and report, and send a plain-language recommendation with a quote. Call 281-979-3405 or contact us online.
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