Anaheim's 2025 supply was about 80 percent or more local groundwater, with the rest imported from the Metropolitan Water District of Southern California. The city's report lists groundwater at 316 mg/L, its Lenain plant at 298 mg/L and imported water at 235 mg/L, with samples from 162 to 431 mg/L. The city's own water-hardness page says Anaheim's water is about 18 gpg, so the figure here is the city's own, not a conversion.
What 18 gpg means
Hardness is measured in grains per gallon (gpg). The U.S. Geological Survey calls water hard from 7.1 to 10.5 and very hard above 10.5. Anaheim's 18 is well inside the very hard band. All three averages in the city's report, for groundwater, the Lenain plant and imported water, sit above the 180 mg/L line USGS uses for very hard. Very hard water leaves scale on fixtures, spots on glass and buildup inside water heaters.
Where your water comes from
The City of Anaheim supplies the water for homes in its water system. It draws mostly on local groundwater and adds imported water from the Metropolitan Water District. Check your water bill to confirm who supplies your address.
Anaheim and water softeners
Anaheim has no rule against salt-based water softeners, and the city says so on its own water-hardness page. Anaheim is served by the Orange County Sanitation District, and we searched that district's discharge ordinance, OCSD-53, in full: it has no provision on softeners. We have not audited every local rule line by line, so confirm before you buy.
State law still applies to any residential softener that discharges to the sewer. It has to regenerate only when needed, carry a certified salt efficiency and be installed with water-saving devices, and a contractor holding a C-55 or C-36 license certifies the installation to the local permit office. What Nuvia recommends in Anaheim has to meet those standards.
What Nuvia does in Anaheim
We offer a free in-home water analysis so you can see your own tap's numbers next to the city's figure. Book it with the form below. If you want to read first, start with water softeners and conditioners, whole-house water filtration or reverse osmosis drinking water.
Nearby cities
Sources
- City of Anaheim Water Quality Report (2026 edition, 2025 water data)
- City of Anaheim, Water Hardness
- Orange County Sanitation District Ordinance OCSD-53 (wastewater discharge)
- California Health and Safety Code, sections 116775 to 116795 (residential water softeners)
- USGS Water Science School: Hardness of water
Questions people ask
How hard is the water in Anaheim?
The City of Anaheim's water-hardness page says about 18 gpg. The city's report lists groundwater at 316 mg/L, its Lenain plant at 298 mg/L and imported water at 235 mg/L, all above the 180 mg/L line USGS uses for very hard.
Where does Anaheim's water come from?
Mostly local groundwater. The city's supply was about 80 percent or more groundwater in the report year, and the rest is imported from the Metropolitan Water District of Southern California.
Does Anaheim ban salt-based water softeners?
No. The city says on its own water-hardness page that it has no prohibitions against salt-based systems. The Orange County Sanitation District's discharge ordinance, which covers Anaheim, has no provision on water softeners. California equipment standards still apply.
What are the California equipment standards for softeners?
A residential softener that discharges to the sewer has to regenerate only when needed, carry a certified salt efficiency and be installed with water-saving devices. A contractor with a C-55 or C-36 license certifies the installation to the local permit office.
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.
Book your free water analysis today.
A Nuvia specialist tests your water at your tap and shows you the numbers.