How hard is the water in Newport Beach, CA?

Tap water hardness
102mg/L
6.0gpg
Moderately hard

Reported by Irvine Ranch Water District · October 2025

CA typical
121 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

The water in Newport Beach carries roughly 102 mg/L of dissolved calcium and magnesium, or 6.0 grains per gallon. That is moderately hard water. The number comes from Irvine Ranch Water District, dated October 2025.

Newport Beach on the hardness scale, with nearby cities
060120180240300360+CA typical 121Costa Mesa: 96 mg/LCosta Mesa 96Irvine: 98 mg/LIrvine 98Laguna Beach: 98 mg/LLaguna Beach 98Laguna Woods: 108 mg/LLaguna Woods 108Fountain Valley: 125 mg/LFountain Valley 125Huntington Beach: 128 mg/LHuntington Beach 128Santa Ana: 150 mg/LSanta Ana 150Aliso Viejo: 160 mg/LAliso Viejo 160Laguna Hills: 160 mg/LLaguna Hills 160North Tustin: 243 mg/LNorth Tustin 243Newport Beach 102mg/L as calcium carbonate060120180240300360+CA 121Costa Mesa: 96 mg/LCosta Mesa 96Irvine: 98 mg/LIrvine 98Laguna Beach: 98 mg/LLaguna Bea. 98Laguna Woods: 108 mg/LLaguna Woo. 108Fountain Valley: 125 mg/LFountain V. 125Santa Ana: 150 mg/LSanta Ana 150102 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 102 mg/L, Newport Beach is 19 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 96 mg/L in Costa Mesa to 243 in North Tustin.

What 102 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Newport Beach

3 people × 75 gallons a day × 6.0 gpg = 1,346 grains a day. A 24,000-grain unit regenerates about every 17 days.

Size it for your household

EPA record for Newport Beach's water system

City of Newport Beach · PWSID CA3010023

No health-based violations since 2016

Serves about 69,520 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists City of Newport Beach as the system serving Newport Beach. The hardness figure above comes from a different system's report, which TapWaterData uses for Newport Beach.

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Newport Beach water hard?

Somewhat. It measures about 102 mg/L (6.0 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Newport Beach in grains per gallon?

About 6.0 gpg. One grain per gallon equals 17.1 mg/L, so 102 mg/L divided by 17.1 gives 6.0.

What size water softener do I need in Newport Beach?

For 3 people using 75 gallons each per day, 6.0 gpg works out to about 1,346 grains a day. A 24,000-grain softener covers that with a regeneration about every 17 days.

Has the Newport Beach water system had EPA violations?

EPA records show no health-based violations for City of Newport Beach since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, October 6, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.