Water treatment for every Southern California home.
Chromium-6, perchlorate, 30 gpg hardness, arsenic in IE wells, Colorado River TDS in San Diego. Every county is different. Every system we install starts with a free water test at your kitchen sink.
Southern California water treatment addresses contaminants that vary significantly by county and water source. Los Angeles homes on LADWP water deal with chromium-6 detected at 0.1 to 0.4 ppb and hardness of 18 to 24 grains per gallon. Orange County adds agricultural nitrate. San Diego gets high total dissolved solids from the Colorado River and Carlsbad desalination blend. Riverside County carries the heaviest hardness in the region at 22 to 32 gpg, plus perchlorate from aerospace legacy sites. San Bernardino basin wells test positive for arsenic approaching 3 ppb and uranium in some ZIP codes. The right water treatment system for a SoCal home starts with a free in-home water test that identifies your ZIP's specific contaminants, then sizes filtration, softening, or reverse osmosis to your actual lab numbers.
What Southern California water actually contains.
SoCal draws from four primary sources: the Eastern Sierra Aqueduct (LADWP), Metropolitan Water District imports from the Colorado River, local groundwater basins, and private wells. Each source carries a different contaminant profile. Most homes see a combination.
California OEHHA public health goal: 0.02 ppb. LADWP reports 0.1 to 0.4 ppb in many ZIPs. Standard carbon filters do not remove it. Requires a dedicated treatment stage.
18 to 32 grains per gallon across most of SoCal. Riverside County averages 28 gpg. At this level, water heater life shortens, tankless units scale, and dishwashers spot glass. Ion-exchange softening is the proven fix.
Chlorination byproducts. LADWP reports 16 to 42 ppb TTHMs; EWG health guideline is 0.15 ppb. Volatilizes as steam in hot showers. Removed by high-activity carbon at the main line.
Rocket-fuel oxidizer that leached into Inland Empire aquifers from aerospace test sites. California MCL is 6 ppb; Riverside wells commonly test 2 to 6 ppb. Requires specific ion-exchange resin.
Naturally occurring metalloid concentrated in Imperial Valley tap water (5.8 ppb) and San Bernardino basin wells (3.2 ppb). EPA MCL is 10 ppb; California PHG is 4 ppt. Removed by RO and adsorptive media.
San Diego water blends Colorado River imports with Carlsbad desalination, resulting in TDS of 540 to 620 ppm and a noticeable mineral taste. Imperial County exceeds 920 ppm. Reverse osmosis reduces TDS by up to 99%.
Which Southern California county has the hardest water problem?
The short answer: Riverside and Imperial have the most severe overall profiles. But every county has at least one contaminant worth filtering. Click into your county for the documented levels and the systems we size for it.
Whole-home filtration vs. water softener vs. reverse osmosis.
The three systems solve different problems. Most SoCal homes need at least two of them. Here is what each one does and what it does not do.
| System | What it removes | What it does not remove | Best for SoCal homes |
|---|---|---|---|
| Whole-home filtration | Chromium-6, chlorine, chloramines, VOCs, PFAS, sediment, hydrogen sulfide | Hardness (scale), nitrate, TDS | LA and OC homes with chromium-6 or TTHM concerns |
| Water softener | Calcium and magnesium (hardness). Stops scale on heaters and fixtures | Chromium-6, chlorine, arsenic, nitrate | Riverside, SB, and IE homes with 20+ gpg hardness |
| Reverse osmosis | Up to 99% of TDS: lead, arsenic, nitrate, fluoride, pharmaceuticals, TDS | Hardness (reduces TDS but RO membranes are not softeners) | San Diego drinking water, IE well water, high-arsenic areas |
| Combo 2-in-1 | Combines filtration and softening in one cabinet | Nitrate, high arsenic, TDS at drinking-water purity | Space-limited installs, 3 to 5 person households, 12 to 30 gpg hardness |
A whole-home filter paired with a water softener handles about 90% of what SoCal tap water throws at a house. Add a reverse osmosis drinking system under the kitchen sink if your ZIP has elevated arsenic, nitrate, or TDS above 500 ppm. We size the exact combination after the free water test.
How does chromium-6 removal work in Southern California?
Chromium-6 became infamous because of the Hinkley contamination case, but it is not limited to one town. LADWP regularly reports detectable levels across large sections of Los Angeles. The challenge is that standard activated carbon, which removes most organic contaminants, does not touch chromium-6.
Effective removal requires either zero-valent iron media (which reduces Cr-6 to insoluble Cr-3) or strong-base anion exchange resin. We install a dedicated chromium-6 stage in the main-line filter where your lab result shows detectable levels. You get a lab report after the install confirming removal efficiency, not just our word for it.
California set its enforceable MCL for chromium-6 at 10 ppb in 2024, but the state's own Office of Environmental Health Hazard Assessment established a public health goal of 0.02 ppb in 2011. That is the standard we size to, not the regulatory floor.
- LADWP (most ZIPs)0.1 to 0.4 ppb5 to 20x above CA public health goal
- Burbank Water + Power0.28 ppbAbove CA OEHHA 0.02 ppb goal
- Pasadena Water + Power0.29 ppbAbove CA OEHHA 0.02 ppb goal
- OCWD / Irvine (IRWD)0.07 ppbDetectable, below average for SoCal
- SDCWA (La Jolla)0.05 ppbDetectable, lower than average
- IEUA San Bernardino0.18 ppbAbove CA OEHHA goal
Well water treatment in Riverside County and the Inland Empire.
Private wells in Riverside, San Bernardino, and the surrounding Inland Empire are not monitored by any utility. The homeowner is responsible for knowing what is in the water. Most are not testing regularly, and many have never tested at all.
Riverside County wells frequently carry iron at 0.3 to 4 ppm. At 0.3 ppm, iron stains laundry. At 1 ppm and above, it discolors fixtures and leaves metallic taste at the tap. San Bernardino basin wells add arsenic approaching 3 ppb and uranium at 8 pCi/L in some ZIP codes. Hydrogen sulfide (rotten-egg odor) is common in deeper wells drawing from reducing groundwater zones.
A well-water treatment stack for a typical Inland Empire home includes: an air-injection iron oxidizer to precipitate dissolved iron, a sediment pre-filter to catch the precipitate, a softener for hardness, and an RO drinking system under the kitchen sink for arsenic and TDS. Where bacteria indicators are present, a UV disinfection stage is added after filtration.
- Iron 0.3 to 4 ppmLaundry staining, metallic taste, fixture discoloration
- Hardness 22 to 32 gpgHeaviest scale in SoCal, shortens appliance life
- Arsenic 1 to 3.2 ppbNo taste or odor. Cancer risk at long-term exposure
- Uranium Up to 8 pCi/LKidney toxicity at elevated levels
- Hydrogen sulfide Detectable to 1 ppmRotten-egg odor from reducing groundwater
- Bacteria indicators SeasonalSeptic intrusion after heavy rain or flooding
How water treatment works from your first call to filtered water.
We come to your sink with strips, meters, and a sample bottle. No printouts, no pressure. You see your numbers in real time.
The sample goes to a certified lab. We walk you through every contaminant detected and what removes it. Your file, kept on the cloud.
Systems sized to your actual water, not a brochure. All-in number. Four financing terms shown side-by-side. No upsell theater.
Most SoCal homes go from test to filtered water in one day. We pull permits, haul the old system, and flush every fixture before we leave.
Services we install.
- Whole-home filtrationHALO 5 at the main line. Removes chromium-6, chlorine, VOCs, PFAS.
- Water softenerHALO CK10 ion-exchange. Sized for 18 to 30 gpg SoCal hardness.
- Reverse osmosisHALO RO 5-stage. Up to 99% TDS removal at the kitchen sink.
- Combo 2-in-1Filtration and softening in one cabinet. 15 to 25% less than two separate systems.
- Smart leak detection24/7 sensors with auto shutoff at the main line.
What we test for.
- Chromium-6Detectable in most LADWP service areas
- Hardness18 to 32 gpg across SoCal
- ArsenicElevated in Inland Empire and Imperial Valley wells
- TTHMsChlorination byproduct in every chlorinated system
- PerchlorateAerospace legacy contamination in Riverside County
- Well waterIron, bacteria, arsenic in private wells
Southern California water treatment FAQ.
What's the best water treatment system for Southern California?
Most SoCal homes need two things: a whole-home filter to remove chromium-6, chlorination byproducts, and VOCs, and a water softener to handle 18 to 30 grains-per-gallon hardness. LA and Riverside homes often need both. San Diego homes also benefit from RO drinking water due to higher TDS from the Colorado River and desalination blend. We size the stack to your ZIP's documented contaminants after a free in-home water test.
Is Southern California tap water safe to drink?
Municipal water in SoCal meets federal Safe Drinking Water Act limits, but those limits were last updated in the 1990s. California's own public health goal for chromium-6 is 0.02 ppb; LADWP reports 0.1 to 0.4 ppb in many service areas. EWG's health guideline for TTHMs is 0.15 ppb while the EPA cap is 80 ppb. Technically compliant does not mean optimally clean for your family.
Does Southern California have hard water?
Yes. Most of SoCal runs 18 to 32 grains per gallon. Riverside County is the hardest, at 22 to 32 gpg. Hardness at this level shortens water heater life, scales tankless units, spots glassware, dulls hair, and dries skin. Ion-exchange softening solves it reliably.
What is chromium-6 and is it a problem in SoCal?
Chromium-6 is a heavy metal that enters water through industrial discharge and the corrosion of aging pipes. California's Office of Environmental Health Hazard Assessment set the public health goal at 0.02 ppb in 2011. LADWP tests between 0.1 and 0.4 ppb in many ZIP codes. Standard activated carbon does not remove it; a dedicated zero-valent iron or strong-base anion exchange stage does.
How long does water treatment installation take?
A whole-home system installs in 2 to 4 hours at the main water line. An RO drinking system under the kitchen sink takes 90 minutes. Combo filter-plus-softener units run 3 to 4 hours. We pull permits, schedule inspection, and haul the old system. Most customers go from free water test to filtered water the same day.
Does well water in Riverside County need special treatment?
Usually yes. Private wells in Riverside and San Bernardino often carry iron (0.3 to 4 ppm), hardness above 28 gpg, and in some zones arsenic or uranium from basin geology. We run a comprehensive well panel in your kitchen before sizing any system. Treatment typically combines an iron oxidizer, sediment pre-filter, softener, and RO drinking stage.
Free water test anywhere in Southern California. Same-day install. 5-year warranty.
A SoCal Water Treatment tech drives to your kitchen, runs the field panel, sends a sample to an independent lab, and returns with a sized quote. You see the numbers before you see a number. 5,000+ installs since 2009.
- Free water test in your kitchen. Nothing charged until you see the lab numbers.
- Three system options, all-in number, four financing terms shown side-by-side.
- 5-year comprehensive warranty. 90-day money-back guarantee.
- Same-day install in most ZIPs. Permits pulled by us.
Cleaner water at every tap by sundown. No upsell theater.
Free water test in your kitchen. Lab report in 24 hours. 5-year warranty. 90-day money-back.
