Skip to main content
24/7 Emergency DispatchCALL NOW (310) 808-7343
Mainline Plumbing
Water Filtration & Treatment.

Our Services

Water Filtration & Treatment.

Whole-home carbon filtration, ion-exchange softeners, under-sink reverse osmosis, and UV purification — sized to your water test, installed at the main, and maintained on a schedule. Serving all 16 South Bay cities.

Property-Friendly Plumber™|Licensed #C-36 901735
Property-Friendly Plumber™

Dispatch a Technician

We respond in under 60 minutes

Emergency / Standard

or reach us directly

(310) 808-7343

Your information is secure and never shared

Limited-Time Special·Valid through Aug 8, 2026
Whole Home Water Filtration Installation

Whole Home Filtration — $2,800 Installed

Carbon + sediment filtration installed at your main water line.

$2,800$5,000+Save over $2,200

South Bay water is drinkable but not clean in the way most homeowners want it to be. LA County's municipal supply runs high on calcium and magnesium (hard water), carries residual chlorine from disinfection, and varies in mineral content block-by-block depending on which treatment facility is feeding your part of the grid. That translates to scale buildup in fixtures, reduced efficiency on water heaters, faster wear on washing machines and dishwashers, and taste/odor issues that drive a lot of households to bottled water. A properly-specified filtration system addresses all of it at the main supply line so every tap in the house delivers treated water.

Whole-home systems install at your main supply line after the meter and treat every drop of water entering the property. Three-stage configurations are typical for South Bay homes: sediment pre-filter (removes particulates), carbon filter (removes chlorine, taste, odor, and organic compounds), and optionally a softener stage (treats hardness through ion exchange). Under-sink reverse osmosis systems are the add-on for drinking water at the kitchen sink — RO removes dissolved solids that whole-home filtration doesn't touch and delivers bottled-water quality from the tap. We size and spec each layer based on actual water test results rather than a standard package.

Whole-home water filtration system installed by Mainline Plumbing at a South Bay residential property
Real job · South Bay

Whole-home filtration installed at the main supply line on a recent South Bay job.

Maintenance is the part most filtration installers don't explain clearly. Sediment pre-filters need replacement every 3–6 months. Carbon filters last 6–12 months depending on usage. Softener resin needs periodic regeneration and eventual replacement (10–15 year intervals). RO membranes last 2–3 years. We set up a maintenance schedule with every installation and offer service contracts for households that prefer us to handle the replacements. A filtration system that doesn't get maintained eventually stops working — we make sure that doesn't happen.

Why Choose Us

18+ Years of Subterranean Infrastructure Mastery in the South Bay. Fully Licensed, Bonded, Insured, and Factory-Certified.

18++ Years Experience5.0 Google RatingFormerly Formerly Jesse's Plumbing
Reverse Osmosis Drinking Water Systems.

Reverse Osmosis Drinking Water Systems

Under-sink reverse osmosis systems that remove dissolved solids and deliver bottled-water-quality drinking water from a dedicated kitchen tap. Installed, serviced, and warrantied across the South Bay.

94–99%

TDS Rejection

50 GPD

Standard Production

2–3 hr

Typical Install Time

Learn More
Whole-Home Carbon Water Filtration.

Whole-Home Carbon Water Filtration

Main-line activated carbon filtration that removes chlorine, sediment, and taste/odor compounds from every tap in the house. Installed at the main supply line after the meter.

Every Tap

Whole-Home Coverage

5–7 yr

Carbon Media Life

3–4 hr

Typical Install

Learn More
Water Softener Installation.

Water Softener Installation

Ion-exchange water softeners that remove calcium and magnesium hardness, protecting water heaters, appliances, and fixtures from scale buildup across the South Bay.

12–18 gpg

South Bay Hardness

3–5 yr

Added Water Heater Life

3–5 hr

Typical Install

Learn More
UV Water Purification Systems.

UV Water Purification Systems

Ultraviolet sterilization systems that inactivate bacteria, viruses, and protozoa without chemicals. Installed as the final stage in well-water and high-purity South Bay filtration systems.

99.99%

Pathogen Inactivation

12–15 GPM

Standard Residential Sizing

Annual

Lamp Replacement

Learn More

Our Process

How It Works

1

Water Test & System Sizing

We test your tap water for TDS, hardness, chlorine, and pH so the system is specified for your actual water profile. Production capacity (50 / 75 / 100 GPD) sized to household demand.

2

Under-Sink Installation

Four-stage manifold mounted to the cabinet, dedicated faucet installed in the sink or counter, cold-water supply tap, drain saddle, and pre-pressurized storage tank. Permit-free, 2–3 hour install.

3

System Flush & Verification

Initial 24-hour flush cycle to condition the membrane, TDS verification at the dedicated faucet (target: under 20 ppm from a 200–400 ppm source), and walkthrough of cartridge locations and replacement schedule.

4

Maintenance Schedule

Pre-filters every 6–12 months, post-carbon every 12 months, RO membrane every 2–3 years. We track your schedule and ship or install replacements on a service contract if requested.

Where We Serve

South Bay Service Area

We proudly serve the entire South Bay of Los Angeles and surrounding communities with fast, reliable plumbing services.

Torrance
Redondo Beach
Hermosa Beach
Manhattan Beach
El Segundo
Hawthorne
Gardena
Carson
Lomita
Rolling Hills Estates
Palos Verdes
San Pedro
Lawndale
Inglewood
Culver City
Long Beach

Common Questions

Frequently Asked Questions

SERVICE AREA

Water Filtration & Treatment Across the South Bay

Trusted by homeowners and businesses in every South Bay city.

Ready to Solve Your Plumbing Problem?

Our Property-Friendly technicians are on standby. No mess, no stress.