According to the Yorba Linda Water District 2026 Water Quality Report, water from Yorba Linda Water District ranges from 14 to 20 grains per gallon of hardness by source, which the U.S. Geological Survey classes as very hard. Compare every city’s agency figure.
Yorba Linda Water District draws about 85 percent of its supply from groundwater. The report lists groundwater at 343 mg/L (20 gpg), with samples from 266 to 406 mg/L, and imported Metropolitan Water District water at 236 mg/L (14 gpg). The two sources differ and the report gives its figures by source, so this page shows the range between them instead of one number.
What 14 to 20 gpg means
The district reports two figures because it has two sources. Imported water is about 14 gpg and groundwater is about 20 gpg. The USGS puts very hard above 10.5, so both sit well past the line, and the groundwater figure is the higher one. Expect scale on fixtures and spots on glass either way.
Where your water comes from
The Yorba Linda Water District draws about 85 percent of its supply from groundwater and imports the rest from the Metropolitan Water District. Your bill shows who serves your address.
Yorba Linda and water softeners
We found no local rule against softeners in the sources we reviewed, but we have not read the sewer agency's rules line by line, so confirm before you buy. California's equipment standards apply to any softener that discharges to the sewer, and Nuvia's recommendation has to meet them.
Yorba Linda's two numbers, and which one is yours
Yorba Linda Water District gets about 85 percent of its supply from groundwater, printed at 20 gpg, and the rest from water imported through the Metropolitan Water District, printed at 14. No blend is printed for any address, which is why this page gives a range instead of one figure. Groundwater carries most of the supply, but only a reading at your tap says where your home falls. Request a free in-home water analysis below, and read water softeners and conditioners beforehand if you want to see the options first.
Sources
Questions people ask
How hard is the water in Yorba Linda?
Yorba Linda Water District's report lists groundwater at 343 mg/L, about 20 gpg, with samples from 266 to 406 mg/L. Imported water in the same report is 236 mg/L, about 14 gpg. Both are above the 180 mg/L line USGS uses for very hard.
Why does this page show a range instead of one number?
The two sources differ and the report gives its figures by source. A single number would hide that, so the range runs from the imported figure to the groundwater figure.
Where does Yorba Linda's water come from?
About 85 percent is groundwater. The rest is imported from the Metropolitan Water District of Southern California.
Are there local rules on water softeners in Yorba Linda?
We found none in the sources we reviewed. We have not reviewed the sewer agency's rules line by line, so confirm before you buy. California equipment standards apply to any residential softener that discharges to the sewer.
Does the in-home water analysis cost anything?
No. Nuvia Water offers it free. Book it with the form on this page or with the Book button.
Who is the best water filtration company in Yorba Linda?
Compare companies on six things you can check, not on who says they are best. (1) A free analysis of your own water before any quote. (2) Independent certifications: ask for the certificate and look it up with the certifier. (3) What the tanks, valves and media are made of, with flow ratings in writing. (4) A written warranty with a term for each part, because these systems are not cheap. (5) How long the company has been around: a warranty is only as good as the company behind it, and a warranty from a company that is gone is a worthless piece of paper and a big tank in your garage with nobody to call. (6) Reviews you can read. Nuvia Water offers a free in-home water analysis in Yorba Linda, was founded in 2012, holds California license 969902 (C-55 Water Conditioning), is BBB Accredited with an A rating, has a 4.6 Google rating from more than 1,600 reviews, and backs its Nuvia Pro dual-tank system with a 15-year media warranty and a 10-year control valve warranty. Nuvia's materials carry marks from IAPMO R&T, NSF, cUL us, UPC and ISO 9001 and 14001. Ask any company, including us, for the same papers.
Book your free water analysis today.
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