Agoura Hills, Westlake Village · Whole Home Water Filtration
Whole home water filtration, Agoura Hills and Westlake Village.
Agoura Hills and Westlake Village are served by Las Virgenes Municipal Water District, which delivers near-100% Metropolitan Water District imported water sourced from the Colorado River and the State Water Project, treated at the Jensen Water Treatment Plant in Sylmar. Unlike LADWP zones that blend local groundwater and aqueduct water with MWD imports, LVMWD carries almost no local groundwater, which means hardness stays at a consistent 8 grains per gallon year-round with no seasonal dilution. The LVMWD 2024 Consumer Confidence Report shows 148 ppm CaCO3 average hardness. At 8 GPG, scale accumulates on water heater elements within the first year. MWD uses chloramine disinfection, which does not off-gas at the tap and requires a catalytic carbon filter to address. The right solution for this water profile is a whole home catalytic carbon filter for chloramine plus a kation-resin softener for the hardness load, installed together at the main supply line.
What is in Agoura Hills tap water?
LVMWD purchases imported water from Metropolitan Water District of Southern California. MWD draws from two major sources: the Colorado River via the Colorado River Aqueduct, and the State Water Project via the California Aqueduct. Both are treated at MWD facilities, including the Jensen Water Treatment Plant in Sylmar, before delivery to LVMWD. Because LVMWD has no significant local groundwater supply of its own, the water delivered to homes in Agoura Hills and Westlake Village is near-100% imported MWD water.
MWD treats water with chloramine rather than free chlorine. Chloramine is a more stable disinfectant that persists through long distribution lines, which suits MWD's regional infrastructure. It does not produce the same trihalomethane byproducts as chlorine, but it does produce its own class of disinfection byproducts and does not dissipate by letting water sit at the tap. The hardness in LVMWD water comes from the dissolved minerals in the Colorado River and State Water Project source water. The LVMWD 2024 Consumer Confidence Report documents hardness at 8 grains per gallon (148 ppm CaCO3 average) for the service area.
How does LVMWD water differ from LADWP water?
LADWP serves most of the San Fernando Valley and the City of Los Angeles with a blend of three sources: the Los Angeles Aqueduct (which carries Sierra Nevada snowmelt and Owens Valley water), local groundwater from the San Fernando Basin and other basin aquifers, and MWD imported water when local supplies are short. The blend ratio shifts by season and year based on snowpack, groundwater levels, and MWD availability. This means hardness in LADWP zones varies: wet years with higher aqueduct and groundwater contribution tend to produce softer water, while dry years leaning on MWD imports push hardness higher.
LVMWD has no equivalent local supply to blend in. The water arriving at an Agoura Hills meter is MWD imported water with no seasonal groundwater dilution. The result is a more consistent hardness profile year-round, holding near 8 GPG regardless of season. Both systems use chloramine disinfection through their MWD supply. The practical difference for a homeowner: LVMWD water is predictably hard rather than variably hard, which makes the case for a permanent softener stronger than in LADWP zones where seasonal variation sometimes reduces the average load.
MWD water sources: Metropolitan Water District: How We Serve You
What water filtration system is right for Agoura Hills homes?
LVMWD water presents two distinct treatment problems: hardness from the MWD imported water blend, and chloramine from MWD disinfection. These require separate systems because they work differently at the molecular level and no single filter media handles both well.
Whole home catalytic carbon filter
- · Targets chloramine and disinfection byproducts
- · Catalytic carbon specifically rated for chloramine (standard carbon is not effective)
- · Addresses taste, odor, and dissolved organic compounds
- · Protects all taps and appliances from disinfection byproducts
- · Installed at the main supply line before any branch point
Kation-resin water softener
- · Removes calcium and magnesium through ion exchange
- · Addresses the 8 GPG hardness load from MWD imported water
- · Prevents scale on water heater elements, dishwasher spray arms, fixtures
- · Smart valve regenerates on actual usage rather than on a fixed timer
- · Installs at the same main supply line location as the filter
Both systems install at the same supply line location and can be done in a single visit. We size the softener to your actual household usage and meter reading, not a default that may over- or under-treat for your home.
Does Westlake Village have the same water supply as Agoura Hills?
Yes. Westlake Village, Agoura Hills, and Calabasas are all served by Las Virgenes Municipal Water District from the same MWD imported water source. All three cities receive water processed through the same MWD treatment chain, including the Jensen Water Treatment Plant in Sylmar, before it enters the LVMWD distribution system. The 8 GPG hardness profile documented in the LVMWD 2024 Consumer Confidence Report applies across the entire LVMWD service area.
The same filtration and softening recommendations apply whether the home is in Westlake Village, Agoura Hills, or Calabasas. There is no meaningful difference in treatment requirements between these cities based on water supply. The primary variable is individual home plumbing layout and household size, which we assess during the free water test before recommending a system configuration.
Frequently asked questions
- How hard is the water in Agoura Hills, CA?
- LVMWD delivers water to Agoura Hills at 8 grains per gallon (148 ppm CaCO3 average) per the LVMWD 2024 Consumer Confidence Report. The hardness is consistent year-round because LVMWD sources near-100% MWD imported water with no seasonal groundwater dilution. At 8 GPG, scale on water heater elements forms within the first year. Verify current readings at lvmwd.gov.
- Does LVMWD use chloramine or chlorine to treat water?
- LVMWD water is treated with chloramine by Metropolitan Water District at the Jensen Water Treatment Plant before delivery. Chloramine is more stable in distribution than free chlorine but does not dissipate at the tap. A catalytic carbon whole home filter is required to address chloramine effectively. Standard activated carbon does not break down chloramine at the rate needed for whole home treatment.
- What is the best whole home water filter for Agoura Hills?
- For Agoura Hills homes on LVMWD supply, the correct approach is a whole home catalytic carbon filter for chloramine and disinfection byproducts, paired with a kation-resin softener for the 8 GPG hardness load. The two systems address different problems and can be installed together at the main supply line in a single visit. We size both systems based on the actual meter reading and household profile.
- Is Westlake Village water the same as Calabasas water?
- Yes. Calabasas, Agoura Hills, and Westlake Village are all served by Las Virgenes Municipal Water District from the same MWD imported water source. All three cities share the same 8 GPG hardness profile per the LVMWD 2024 Consumer Confidence Report. The same treatment approach applies across all three cities. The only variable between homes is individual plumbing layout and household size.
Google Reviews
Our reviews are building. Our work started six years ago.
If we earn it, we ask. When reviews arrive they appear here verbatim, from real Google Business Profile posts.
Your free water test
Know exactly what's in your water. Same week.
We bring the test strips, the equipment, and five-years of installs to your kitchen sink. No charge. No obligation. You walk away knowing · even if you don't hire us.
Same-day · 5-year warranty · $0 down