A softener swaps the calcium and magnesium that make water hard for a small amount of sodium or potassium, so scale stops forming in your water heater, on your fixtures and inside your pipes. Here’s what goes into putting one in a Houston home.
How hard Houston’s water is, by the City’s own report
The City of Houston’s 2025 water quality report puts hardness on the Main System at 135.5 mg/L, about 7.9 grains per gallon. The U.S. Geological Survey calls anything from 121 to 180 mg/L “hard.”
On a MUD or another utility outside the City, your number can be different, and the report you get may not list it at all. Bring us whatever your district publishes, and your technician will go over what’s coming out of your tap on the visit.
What hard water does inside a water heater
USGS says: when hard water is heated, calcium carbonate settles out as scale, and that scale can shorten the life of the equipment and raise the cost of heating the water. In a tankless unit the scale builds up inside the heat exchanger’s narrow passages.
Navien’s installation manual for its NPE tankless line says to flush the unit once a year at 4 to 7 grains per gallon and marks a water softener “Recommended” from 7 to 9 grains. Houston’s Main System, at about 7.9 grains, sits inside that second band. If you already own a tankless unit, our tankless water heater page covers descaling.
A new water heater and a softener on the same visit
77088, August 2026: the home needed a new water heater, and a softener went in on the same trip. The new water heater started out on softened water instead of collecting scale from day one.
The water is already shut off and the technician is already at the main line, so one visit does both. If your water heater is near the end of its life, tell us when you call and we’ll quote it both ways, the heater alone or the heater with a softener (see water heater repair and replacement).
Loop or no loop: what we find in Houston homes
Many newer homes in northwest Houston and Cypress were built with a softener loop: a pair of capped pipe stubs, usually in the garage near the water heater, ready for a softener to tie in. Older homes mostly don’t have one, and Houston has plenty of those: Census figures show about 40% of the city’s housing was built between 1940 and 1979.
With a loop, the install is straightforward. Without one, your technician will tell you on the visit what it takes to add a tie-in and where it would go. The usual goal is to soften the water used inside while the hose bibs stay on unsoftened water, so you’re not paying to soften the lawn. How long the install takes depends on which case you’re in; you get a time estimate with the price.
What moves the price of a softener install: whether the house has a loop or needs a tie-in, how far the unit sits from a drain and an outlet, the size of the unit your household needs, and whether a water heater goes in on the same visit. You see all of it in writing before we start.
Northwest Harris County’s water is changing
In a MUD on the northwest side, your water source may be switching. The North Harris County Regional Water Authority is moving its districts from well water to treated surface water to meet the Harris-Galveston Subsidence District’s groundwater limits: a 60% cut by 2025 and 80% by 2035.
West Harris County MUD 10 told its residents in June 2026 what to expect: softer water with fewer spots and less scale, a few weeks of discolored water as old scale loosens inside the pipes, and a change in disinfectant from chlorine to chloramine.
For a softener owner that means two things: have the hardness checked again after your district converts, because a unit set for harder water may regenerate more often than it needs to, and expect loosened scale in faucet aerators and at the softener’s inlet for a while.
Sizing and the kind of unit
A softener is sized by how much hardness it has to remove between regenerations, which comes down to how many people live in the house and how hard the water is. Your technician sizes it from your household and your water, not from a chart on a box.
A metered (demand-initiated) softener regenerates only after a set amount of water has passed through it, so it isn’t flushing salt down the drain on a timer while you’re away. And a “salt-free softener” is a conditioner, not a softener: it changes how scale behaves but doesn’t remove hardness.
Ask your technician which models we recommend for your house. If your home is on a septic system, Texas rules require a softener with demand-initiated regeneration and a label naming the installer; tell us when you call so the unit we quote meets that rule. (We don’t service septic systems themselves.)
Salt, sodium and your drinking water
A softener replaces hardness minerals with a small amount of sodium. For most people that’s nothing to think about. For someone on a strict sodium restriction it can be: the EPA’s guidance level is 20 mg/L of sodium in drinking water for people limited to 500 mg of sodium a day.
If that’s you, say so when you call. Potassium chloride is sold as a substitute for softener salt, and some homeowners keep one cold tap unsoftened for drinking. Which of those fits your house depends on your unit and your plumbing.
Who may install a softener in Texas
In Texas, tying a softener into your water lines is plumbing under the Occupations Code, and the TCEQ requires a Water Treatment Specialist license for anyone who installs or services water treatment equipment unless they’re a licensed plumber. Not every softener seller in Houston shows either number on its website. Ours go in under our master plumber’s Texas license; the number is at the top of this page. Texas also requires the full license block on plumbing proposals and invoices.
Sources: City of Houston 2025 water quality report · USGS, hardness of water · Navien NPE installation and operation manual · U.S. Census Bureau, year structure built (Houston) · North Harris County Regional Water Authority · West Harris County MUD 10, water supply conversion notice (June 2026) · Vermont Department of Health, sodium in drinking water (EPA guidance) · Texas Occupations Code §1301.002 · TCEQ, Water Treatment Specialist license · Texas Health & Safety Code §366.013 · 30 TAC §285.37. Checked November 2026.
