The water softener loop in your Las Vegas home, explained
Some Las Vegas homes are built with a place for a softener already piped in. Here's how to spot it, what the softener needs around it, and your options when there's nothing there.
What a softener loop is and why your garage may have one
A water softener loop is a section of your main cold-water line that a builder or plumber has routed out to a reachable spot and left ready for a softener. Instead of cutting into the main line on installation day, the installer opens the loop and connects the softener’s inlet and outlet to its two ends.
The loop also decides which taps get softened water. Morton’s installation manual (2024) says to put the softener near where the water comes in, ahead of every other connection except the outside pipes, and to leave outside faucets on hard water so you don’t spend salt on watering. It also says the softener always goes between the water inlet and the water heater. A loop that’s done well already follows that order: the hose bibs branch off before it, and the water heater sits after it.
A water softener bypass loop is a slightly different thing: three valves, or a built-in bypass on the softener’s head, that let water skip the softener. Pentair’s Fleck manual says to always provide a bypass if a unit doesn’t come with one, and the Morton, GE, Pentair and WaterBoss manuals we read all describe a bypass valve fitted to the softener itself.
How to tell if your Las Vegas home already has a loop
To check whether your home has a softener loop, start in the garage, then look near the water heater and wherever the main line comes into the house. A softener needs the main line, a drain and power in one spot, so a loop is usually left where those meet. Look for:
- Two capped stubs of copper or PEX coming out of the wall or floor a few inches apart.
- A U-shaped bend where the pipe leaves the wall, turns and goes back in. That’s a loop that was joined so the house works without a softener; it gets cut open when one is fitted.
- An outlet and a drain close by, such as a standpipe near the stubs.
In a home built on a concrete slab, the pipes run under the floor and inside the walls, with no crawl space to check. If you’re not sure, a plumber can trace the line.
Work out the right softener for your home
Showing the answers you gave earlier.
1. Who supplies your water?
2. How many people live in your home?
What the dial setting means
This is the number to key into your softener's control head (the box on top of the tank) where it asks for water hardness, often shown as "Hardness" or "gpg". It is how the softener knows how much hardness it is taking out of each gallon.
When the resin inside is full of minerals, the softener recharges: it washes the resin with brine from the salt tank and sends the minerals down the drain. For your household that works out to about every 8 days, and it happens automatically.
Too low a number lets hard water through between recharges. Too high a number makes it recharge sooner than it needs to, using extra salt and water.
Connecting to your loop? Look for a 32,000-grain softener, and set its hardness to 16 the day it goes on.
The water district publishes one figure for the whole valley; your street can differ a little. Source: Las Vegas Valley Water District, water quality summary, 2026 (2025 data).
We don't make, sell or install water softeners or filters. Every hardness figure comes from the water utility's own published report, not from us or a seller.
How this figure was measured
Who published it
What the figure is
How we use it
What the loop needs around it: drain, power and heat limits
A loop alone isn’t enough. The softener also needs a drain for the water it flushes when it recharges, and an ordinary outlet for its control head.
The drain and its air gap. Every manual we read asks for a gap of open air between the end of the drain hose and the drain itself, so waste water can’t be pulled back into the softener: 1-1/2 inches in Morton’s and Whirlpool’s manuals, at least 2 inches in WaterBoss’s, and twice the pipe size (at least 1 inch) in Pentair’s manual for its Fleck valve. Morton also says to avoid hose runs longer than 30 feet or more than 8 feet above the floor.
What local code has said. Southern Nevada’s 2006 local changes to the plumbing code, published by Clark County, said softener discharge should end at the second port of a clothes-washer drain box through an air gap. The current local amendments, adopted by the County Commission in July 2025 and in force from January 11, 2026, no longer mention softeners at all, so the base plumbing code governs. Ask your city or county building department, or your plumber, what they accept today.
Septic homes. If your home isn’t on sewer, the Southern Nevada Health District’s septic rules say backwash from water softeners into a septic system is prohibited. Plan a different drain point before you connect.
Heat. Morton and GE both warn that direct sun can warp a softener’s plastic parts. For heat limits and outdoor spots, see our guide to an outdoor water softener in Las Vegas.
Water softener loop installation, step by step
Once the loop is found, water softener loop installation is a short job. For the full sequence, from shutting off the main to the first recharge, see our Las Vegas water softener installation guide. The loop-specific parts are:
- Shut off the main and open a low tap to drop the pressure.
- Cut the U-bend or remove the caps. Note which stub comes from the street; that’s the inlet.
- Fit adapters to suit the pipe. A PEX water softener loop takes PEX fittings; copper takes copper or push-fit adapters. Keep torch heat off the softener’s plastic valve.
- Connect inlet to inlet and outlet to outlet. Arrows on the bypass show the flow. Backwards is the classic mistake.
- Restore the ground if the pipes are metal. Pentair warns that a softener on copper or galvanized pipe can break the electrical ground that runs through the plumbing in some homes. A jumper wire across the loop, or a bypass of the same metal, restores it.
- Check for leaks, then again after the first recharge.
No loop? Your options in a slab home
If there’s no loop, you can still have a softener. A plumber has to cut into the main line where it’s reachable, add the two ends, and run a drain and an outlet if they’re missing. How easy that is depends on where the main comes out of the slab and how far it is to a drain.
No utility or agency here publishes a price for adding a loop. Get written quotes, and ask each plumber how they’ll keep the hose bibs on hard water and restore the ground, and who pulls the permit. In unincorporated Clark County, the county’s fee schedule as amended in 2022 lists $56.57 for a water softener plumbing permit and, separately, a $54.00 permit issuance fee; that is the 2022 schedule, so check the current one. A city building department sets its own fees. If you’d rather not own the equipment, renting is another route; see renting a water softener in Las Vegas.
Setting the softener once it’s on
The Las Vegas Valley Water District’s annual water quality report, published in 2026, tells customers to set their softener to its hardness: 280 parts per million, or 16 grains per gallon. Henderson and the outlying systems differ; our Las Vegas water softener settings page lists each one.
Sources for this page
- Las Vegas Valley Water District · annual water quality report · 2026 · the softener setting of 280 ppm / 16 gpg.
- Clark County · county building fee schedule · as amended in 2022 · plumbing permit fee for a water softener and the permit issuance fee.
- Clark County · Southern Nevada amendments to the plumbing code · 2006 and 2025 (in force 2026) · the old air-gap rule for softener drains and its absence now.
- Southern Nevada Health District · septic system regulations · revised 2009 · the ban on softener backwash into septic systems.
- Morton water softeners · installation and operation manual · 2024 · where the softener goes, outside faucets, air gap, hose limits, sun.
- Pentair · whole-house softener manual (2020) and Fleck valve service manual (2018) · grounding on metal pipe, drain air gap.
- Whirlpool Water Solutions · installation booklet (2017) and owner FAQ (undated) · air gap and typical lifespan.
- WaterBoss · owner’s manual · 2020 · minimum drain air gap.
- GE Appliances · softener owner’s manual · 2023 · sun damage to plastic parts.
- EcoWater Systems · comparison article on its website · undated · typical lifespan.
Questions we get asked
- What happens when you bypass your water softener?
- Water flows straight past the softener, so the whole house gets hard tap water again while the softener sits idle. Makers fit bypass valves so you can do this for leaks, service or long spells of outdoor watering without shutting off the house.
- How do I know if my house has a softener loop?
- Look in the garage, near where the main line comes in and near the water heater. Two capped pipe stubs side by side, or a pipe that rises out of the wall, bends and goes back in, usually marks a loop. A drain and an outlet close by are good signs too.
- Where should a water softener be installed?
- On the cold main line, after any branch to outside faucets and before the water heater, out of direct sun and away from freezing, with a drain and a power outlet nearby. A garage can meet all of that.
- How much does it cost to add a water softener loop?
- No utility or agency in Southern Nevada publishes a figure. The price depends on how far the main line is from a drain and outlet and what the walls and slab allow, so get written quotes from licensed plumbers.
- How long does a water softener last?
- Two makers, Whirlpool and EcoWater, put the typical life at about 10 to 15 years with regular care. The loop itself is ordinary pipe and outlasts the softener; it is reused when the unit is replaced.