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A clear, sourced look at where Orange County's water comes from, how hard it is, and what it means for your home and family.
Unlike most regions that rely on one local supply, Orange County draws its drinking water from a mix of imported and local sources. The exact ratio depends on your city.
Imported via the Metropolitan Water District (MWD). Higher in dissolved minerals from its long travel through Western soil and rock.
Sierra Nevada snowmelt piped down through the California Aqueduct. Generally softer than Colorado River water but treated with chloramine.
Pulled from the Orange County Groundwater Basin and replenished by the OCWD with recycled and storm water. Generally hardest of the three.
Water hardness is measured in grains per gallon (gpg) or milligrams per liter (mg/L). Anything over 10.5 gpg is classified as 'very hard' — and that's most of Orange County.
OC water meets all federal EPA standards — but EPA standards focus on preventing illness, not on optimizing taste, skin, or long-term health. Here's what else shows up in OC's reports.
Required disinfectants. Effective at killing pathogens, but harsh on skin, hair, and gut bacteria. Carbon filtration removes both.
Detected in OC wells, prompting OCWD to install GAC and IX treatment systems. New EPA limits took effect in 2024 — RO is the most reliable home-level removal.
OC tap water typically runs 250–500 ppm TDS. Bottled water averages 50–150 ppm. RO drops your tap below 20 ppm — cleaner than most bottled brands.
Agriculture and infrastructure history leave trace nitrates, arsenic, and copper. Within EPA limits, but reverse osmosis filters them down to undetectable.
Hard water and chlorinated water aren't dangerous — but they leave a mark. Here's where most OC homeowners notice it first.
Calcium and magnesium build up as scale inside pipes, water heaters, and dishwashers. Water heaters lose 10–25% efficiency for every year of scale buildup. Most fail years earlier than they should.
Hard water leaves a film that prevents soap from rinsing fully — dry skin, dull hair, and eczema flare-ups are common. Chlorine compounds strip natural oils, making it worse.
White scale on faucets, etched glassware, spotted dishes, premature failure on washing machines and dishwashers. Soft water can extend appliance life 30–50%.
High TDS gives water a mineral taste many families don't love. The standard fix is buying bottled — which adds up to $600–$1,200 a year for a household and creates plastic waste.
Mission Water designs each home system around what's actually in OC water — hardness, chlorine, and TDS. One install. One licensed crew. Lifetime support.
Removes calcium & magnesium so pipes, appliances, and skin all get a break.
Strips chlorine, chloramine, and contaminants at the main line.
Removes 99.9% of dissolved solids and remineralizes for great taste.
This page draws from public regulatory reports. We update it as new data is published. If you want to dig deeper, here's where to start.
Want to know your exact hardness and contaminant levels by street address? Send your zip code to hello@missionwater.co and we'll pull the latest report for you.