Most plumbers can set a water softener. Far fewer can walk into a kitchen, read the hardness, size the unit to that family, and explain in plain English why it is worth the money.
That second part is what softener training is really about. The piping is the easy half.
Short answer
Good softener training covers four things: reading hardness, sizing to the house, installing so it does not come back as a callback, and explaining it to the homeowner. A licensed plumber already has most of the install skills. The gaps are usually the water science and the conversation.
Hardness is dissolved calcium and magnesium, reported in grains per gallon (gpg) or milligrams per liter. One grain per gallon is about 17.1 mg/L. Many utilities publish it. Some do not publish it at all, and the EPA sets no standard for hardness.
The inputs are the water's hardness, how many people live there, how much water they use, and the flow the house needs at its busiest. Iron and manganese change the numbers. Get an input wrong and the unit regenerates too often or runs out of capacity.
Bypass valve, drain, brine line, overflow, power and location. The details below are where the callbacks come from.
A homeowner who understands why the water heater scales and the soap will not lather buys for a reason. A homeowner who hears a pitch shuts down. That difference is trained, not natural.
The water
These are the grains-per-gallon bands used across this site. Some scales split the low end further, but the breakpoints that matter for a sale are the same.
| Grains per gallon | Classification | What the homeowner usually notices |
|---|---|---|
| 0 to 3.5 | Soft | Little or no scale |
| 3.5 to 7 | Moderately hard | Spotting on glassware, some scale over time |
| 7 to 10.5 | Hard | Scale in the water heater, film in the shower, soap that will not lather |
| Above 10.5 | Very hard | All of the above, faster |
Dallas reports 120 to 155 mg/L, or 7.0 to 9.1 grains, which is hard (see our Dallas water guide). Carlsbad, California runs 3.5 to 13.5 grains depending on the district and the desalination blend (see our Carlsbad water guide), so two houses a few miles apart can need different answers. See water hardness by city for the figures each utility publishes.
The install
None of this is new to a licensed plumber. It is the list that gets skipped when a softener is treated as a quick add-on.
Regeneration sends brine down the drain. Treat it as indirect waste and give it the air gap your adopted code calls for. Codes differ on whether an air break is ever allowed, so check the edition your jurisdiction uses.
A bypass valve keeps the house in water during service and lets you isolate the unit. Leave it out and every service call becomes a shutdown.
Decide with the homeowner which lines stay on hard water, such as outdoor hose bibbs and irrigation, before you cut in the loop.
Level base, overflow routed to a drain, salt the homeowner can actually reach. A tank that floods the garage is a callback.
Garages, utility rooms and outdoor installs each come with freeze, sun and power questions. Answer them before the unit goes in.
Some sewer agencies restrict salt-based softener discharge. In parts of San Diego County it is prohibited on district sewers. Check before you sell one. See California rules.
Your options
There is no single right path. It depends on whether you need a license, a credential, product knowledge, or the ability to sell it in the home.
| Option | Format | What it is built for | Cost as listed |
|---|---|---|---|
| WQA Installer Training Course | Live online, about 2 hours a week for roughly 21 weeks | Safe, code-compliant installation of softeners, filters, disinfection and RO. Prepares you for WQA's Certified Installer exam. | $1,339 to $1,859 for WQA members, $2,659 for non-members, CI exam included |
| TWQA Basic Water Conditioning (Texas) | 6 contact hours, online by WebEx or in person | A TCEQ-approved version of the Basic Water Conditioning course that Class II and Class III Texas Water Treatment Specialist licenses require | $150 members, $300 non-members (early registration) |
| Manufacturer training | Varies. North Star, for example, runs residential training for plumbers by request, plus on-demand videos | That brand's equipment, sizing and warranty | Varies by manufacturer, often tied to becoming a dealer |
| HALO Water Tour | Three consecutive days, in person, twenty seats | Water science, HALO product knowledge and selling water treatment in the home. A certification exam every day. Nothing is installed in class. | $5,000 per seat, team pricing from three seats |
Prices are what each organization listed in September 2026. Check the source before you enroll.
Straight answer
The full day-by-day breakdown is on the curriculum page.
Questions
It depends on the state. In Texas, TCEQ exempts individuals licensed as plumbers under Occupations Code Chapter 1301 from its Water Treatment Specialist license, and non-plumbers who install under contract need that license. In California, CSLB has a C-55 Water Conditioning Contractor classification, and the C-36 Plumbing Contractor classification covers maintaining and replacing water conditioning equipment. Check your own state's licensing board before you install.
It ranges widely. TWQA's Basic Water Conditioning course is 6 contact hours. WQA's Installer Training Course runs about 21 weeks at 2 hours a week. The HALO Water Tour is three consecutive days. Manufacturer training varies by brand.
Some manufacturers train their dealers and contractors, and some offer free online material. Free training usually centers on one brand's equipment. It rarely covers how to read a home's water and present the options to the homeowner.
WQA certification is a voluntary industry credential. Texas's Water Treatment Specialist license page does not list it as a requirement. Some plumbers hold it because customers and employers recognize it.
A softener removes hardness, the calcium and magnesium that scale water heaters and fight soap. A filter reduces things you can taste, smell or would rather not drink. Many homes need both, and the homeowner should know which problem is being solved before anyone quotes a price.
No. Nothing is installed in class. The three days cover water science, the HALO product line and sizing, and selling water treatment in the home, with a certification exam at the end of each day. It assumes the plumber in the seat already knows how to install.
Sources
Checked in September 2026. Rules and prices change, so confirm with the source before you rely on them.
Written by Roger Wakefield, Texas Master Plumber
45 years in the trade and LEED AP. Published . More about Roger
Keep going
Three consecutive days, in person, twenty seats a city: Carlsbad October 27-29 and Dallas November 3-5, 2026. A certification exam closes every day, and the HALO Certified Water Quality Expert credential is awarded on day three.