Louisville treats surface water from South Boulder Creek and the Colorado River basin at two city plants, and its 2026 report does not list a hardness figure. A softener only makes sense once a test shows enough hardness to cause trouble. Call the number on this page to be connected with a local plumber in Louisville.

What happens when you call
You will reach an independent plumber who works in Louisville. Describe what you are seeing, the age and type of your water heater, and whether your home is original or one of the hundreds rebuilt after the December 2021 Marshall Fire. A visit usually starts with a hardness test at the kitchen tap. If the reading is low, expect the plumber to say so; if it is high enough to matter, they will size a softener for your household and find a spot with a drain and an outlet.
What affects the price
- Test results, which may rule a softener out entirely
- Softener capacity and a demand-based valve
- A carbon filter for chlorine taste
- Main line location and finished walls in the way
- Bypass plumbing for irrigation and outdoor taps
- Permit and inspection through the city
Louisville water
The City of Louisville Public Works runs two water treatment plants. Its supply is surface water from South Boulder Creek, stored in Marshall Lake, Harper Lake or Louisville Reservoir, plus water from the Colorado River basin. Water is disinfected with chlorine, not chloramine, and the 2026 report lists no health-based violations. Hardness is not stated. That means a softener salesperson has no published figure to point to, and neither do you, so ask for a test.
Since Louisville uses chlorine, a standard carbon filter is a simple fix for taste. That is often the only treatment a household wants once testing rules out heavy hardness. Very few homes in the city are on private wells; nearly everyone is on the municipal system.
The city keeps a service line inventory to confirm no customers are served by lead lines and asks owners with unknown materials to self-report. For homes rebuilt after the Marshall Fire, plumbing is new, so the main reason to add treatment is to protect new fixtures and water heaters.
Louisville's Building Safety Division at City Hall on Main Street issues permits and performs plumbing inspections.
Prep list
- Find the main shutoff and confirm it closes
- Clear space near a floor drain or laundry standpipe
- Note which outdoor faucets and irrigation lines you want left untreated
- Have a recent water bill handy for sizing
Water Softeners & Filtration questions in Louisville
Does my water provider publish a hardness number?
Will a softener get rid of chlorine or chloramine taste?
Does a softener help a water heater or tankless unit last?
Is there an option that does not use salt?
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