A water treatment business sells and installs softeners, filters and reverse osmosis systems, and often services well pumps and pressure tanks. Many start as a dealer for one equipment brand. Others are plumbers who add water treatment. Either way, the steady money is the service plan after the install.
- Installing on a home's water lines can need a plumbing license; well pump work can need a well contractor license.
- The EPA says private well water is not regulated by the federal government under the Safe Drinking Water Act.
- Test the water before you size a system, and put the result in the estimate.
- Sell a service plan with every install.
1. Decide what you will offer
| Work | Who asks | Notes |
|---|---|---|
| Water softeners | Homeowners | Sized from a hardness test |
| Filters and reverse osmosis | Homeowners | Sized from a water test |
| Well pumps and pressure tanks | Rural homeowners | Emergency calls |
| Salt delivery and filter changes | Every customer | Recurring income |
| Water testing | Home buyers, well owners | Leads to the rest |
Plumbers, well drillers and home inspectors find hard water and failing pumps. Ask them to refer you.
2. Check the license and permits
Connecting equipment to a home's water lines can need a plumbing license, depending on the state and the work. Well pump work can need a separate well contractor license. Our plumbing licensing guide shows how each state treats plumbing work; ask your state about well licensing too.
3. Know what the EPA says about wells
The EPA says private well owners are responsible for delivering safe drinking water to their households, and that the quality and safety of water from private domestic wells are not regulated by the federal government under the Safe Drinking Water Act nor by most state governments. That is why well owners need a water treatment company that tests honestly and explains the results.
4. Register the business and set up taxes
The SBA lists the launch steps in this order: pick a location, choose a structure, choose a name, register, get federal and state tax ID numbers, apply for licenses and permits, open a business bank account, and get insurance. For a water treatment business working out of a truck, the location is usually your home address and the area you will serve.
- Structure. A sole proprietorship is the simplest. An LLC keeps the business separate on paper. Ask an accountant which fits your state and your plans.
- Tax ID. The IRS gives out an employer identification number (EIN) online, and says you never have to pay a fee for one. Websites that charge for an EIN are not the IRS.
- Self-employment tax. The IRS lists the self-employment tax rate as 15.3%: 12.4% for Social Security and 2.9% for Medicare. Income tax comes on top, so set money aside from every job.
- Bank account. Open it before the first payment lands, so every dollar in and out is easy to find at tax time.
5. Pick a name customers can say and find
Your name goes on the truck, the invoices, the Google profile and the yard signs, so pick it once. The free water treatment name generator gives 36 ideas for your town and style, each with a domain idea, and lists the checks to run before you commit: your state's business name search, a federal trademark search and the domain itself.
6. Get insured before the first job
The SBA describes general liability insurance as cover for financial loss from bodily injury, property damage, medical expenses and defending lawsuits. It says businesses with employees are required to carry workers' compensation, unemployment and disability insurance, and some states ask for more.
Claims are leaks at a new softener, a flooded basement from a failed fitting, and a pump that fails after install. Ask your agent about general liability with completed work, commercial auto, and workers' compensation once you hire.
7. Gear up and add up your startup costs
No total here on purpose. What you spend depends on what you already own, new or used, and how much work you plan to take on. Price your own list with a local supplier, then put the numbers in the startup cost table of the free business plan generator, which adds them up for you.
- Plumbing tools, fittings and a pipe cutter for each material
- Water test kits and meters
- Pump pulling equipment if you service wells
- A van with stock of filters, resin and parts
- Hand truck for softeners and salt
Plumbing tools are modest. Equipment stock and, for well work, a pump hoist are the larger costs.
8. Set your prices
Price the install from equipment, parts and hours, and price the yearly service the same way. Our guide to pricing water treatment jobs walks through a softener, and the free maintenance plan pricing calculator prices the plan.
9. Find your first customers
- Plumbers and well drillers. They find hard water and failing pumps.
- Home inspectors. Buyers ask about water tests.
- No-water calls. Koira answers every call, weekends too.
- Your past installs. Service plans keep them yours.
10. Get paid and keep the customer
Collect on install with pay at the door, offer pay over time on larger systems, and on Front Office bill the service plan on the card on file.
11. Grow past one truck
A service tech who runs filter changes and salt frees you to sell and install. Read how water treatment companies run on Koira.
Sources
- SBA: Launch your business (the launch steps), checked October 8, 2026
- SBA: Get business insurance, checked October 8, 2026
- IRS: Get an employer identification number, checked October 8, 2026
- IRS: Self-employment tax (Social Security and Medicare taxes), checked October 8, 2026
- EPA: Private drinking water wells, checked October 9, 2026
Last checked October 8, 2026. This page is general information, not legal or tax advice. Rules change and differ by state and city, so confirm with the agency named before you act.